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Remote control

In electronics, a remote control (also known as a remote or clicker ) is an electronic device used to operate another device from a distance, usually wirelessly. In consumer electronics, a remote control can be used to operate devices such as a television set, DVD player or other digital home media appliance. A remote control can allow operation of devices that are out of convenient reach for direct operation of controls. They function best when used from a short distance. This is primarily a convenience feature for the user. In some cases, remote controls allow a person to operate a device that they otherwise would not be able to reach, as when a garage door opener is triggered from outside.

Early television remote controls (1956–1977) used ultrasonic tones. Present-day remote controls are commonly consumer infrared devices which send digitally-coded pulses of infrared radiation. They control functions such as power, volume, channels, playback, track change, energy, fan speed, and various other features. Remote controls for these devices are usually small wireless handheld objects with an array of buttons. They are used to adjust various settings such as television channel, track number, and volume. The remote control code, and thus the required remote control device, is usually specific to a product line. However, there are universal remotes, which emulate the remote control made for most major brand devices.

Remote controls in the 2000s include Bluetooth or Wi-Fi connectivity, motion sensor-enabled capabilities and voice control. Remote controls for 2010s onward Smart TVs may feature a standalone keyboard on the rear side to facilitate typing, and be usable as a pointing device.

History
Wired and wireless remote control was developed in the latter half of the 19th century to meet the need to control unmanned vehicles (for the most part military torpedoes). These included a wired version by German engineer Werner von Siemens in 1870, and radio controlled ones by British engineer Ernest Wilson and C. J. Evans (1897) and a prototype that inventor Nikola Tesla demonstrated in New York in 1898. In 1903 Spanish engineer Leonardo Torres Quevedo introduced a radio based control system called the "Telekino" at the Paris Academy of Sciences, which he hoped to use to control a dirigible airship of his own design. Unlike previous “on/off” techniques, the Telekino was able to execute a finite and non-limited set of different mechanical actions, using a single communication channel. From 1904 to 1906 Torres chose to conduct Telekino testings in the form of a three-wheeled land vehicle with an effective range of 20 to 30 meters, and guiding a manned electrically powered boat, which demonstrated a standoff range of 2 kilometers. The first remote-controlled model airplane flew in 1932, and the use of remote control technology for military purposes was worked on intensively during the Second World War, one result of this being the German Wasserfall missile.

By the late 1930s, several radio manufacturers offered remote controls for some of their higher-end models. Most of these were connected to the set being controlled by wires, but the Philco Mystery Control (1939) was a battery-operated low-frequency radio transmitter, thus making it the first wireless remote control for a consumer electronics device. Using pulse-count modulation, this also was the first digital wireless remote control.

Television remote controls
The first remote intended to control a television was developed by Zenith Radio Corporation in 1950. The remote, called Lazy Bones, was connected to the television by a wire. A wireless remote control, the Flash-Matic, was developed in 1955 by Eugene Polley. It worked by shining a beam of light onto one of four photoelectric cells, but the cell did not distinguish between light from the remote and light from other sources. The Flashmatic also had to be pointed very precisely at one of the sensors in order to work.

In 1956, Robert Adler developed Zenith Space Command, a wireless remote. It was mechanical and used ultrasound to change the channel and volume. When the user pushed a button on the remote control, it struck a bar and clicked, hence they were commonly called "clickers", and the mechanics were similar to a pluck. Each of the four bars emitted a different fundamental frequency with ultrasonic harmonics, and circuits in the television detected these sounds and interpreted them as channel-up, channel-down, sound-on/off, and power-on/off.

Later, the rapid decrease in price of transistors made possible cheaper electronic remotes that contained a piezoelectric crystal that was fed by an oscillating electric current at a frequency near or above the upper threshold of human hearing, though still audible to dogs. The receiver contained a microphone attached to a circuit that was tuned to the same frequency. Some problems with this method were that the receiver could be triggered accidentally by naturally occurring noises or deliberately by metal against glass, for example, and some people could hear the lower ultrasonic harmonics.

In 1970, RCA introduced an all-electronic remote control that uses digital signals and metal–oxide–semiconductor field-effect transistor (MOSFET) memory. This was widely adopted for color television, replacing motor-driven tuning controls.

The impetus for a more complex type of television remote control came in 1973, with the development of the Ceefax teletext service by the BBC. Most commercial remote controls at that time had a limited number of functions, sometimes as few as three: next channel, previous channel, and volume/off. This type of control did not meet the needs of Teletext sets, where pages were identified with three-digit numbers. A remote control that selects Teletext pages would need buttons for each numeral from zero to nine, as well as other control functions, such as switching from text to picture, and the normal television controls of volume, channel, brightness, color intensity, etc. Early Teletext sets used wired remote controls to select pages, but the continuous use of the remote control required for Teletext quickly indicated the need for a wireless device. So BBC engineers began talks with one or two television manufacturers, which led to early prototypes in around 1977–1978 that could control many more functions. ITT was one of the companies and later gave its name to the ITT protocol of infrared communication.

In 1980, the most popular remote control was the Starcom Cable TV Converter (from Jerrold Electronics, a division of General Instrument) which used 40-kHz sound to change channels. Then, a Canadian company, Viewstar, Inc., was formed by engineer Paul Hrivnak and started producing a cable TV converter with an infrared remote control. The product was sold through Philips for approximately $190 CAD. The Viewstar converter was an immediate success, the millionth converter being sold on March 21, 1985, with 1.6 million sold by 1989.

Other remote controls
The Blab-off was a wired remote control created in 1952 that turned a TV's (television) sound on or off so that viewers could avoid hearing commercials. In the 1980s Steve Wozniak of Apple started a company named CL 9. The purpose of this company was to create a remote control that could operate multiple electronic devices. The CORE unit (Controller Of Remote Equipment) was introduced in the fall of 1987. The advantage to this remote controller was that it could "learn" remote signals from different devices. It had the ability to perform specific or multiple functions at various times with its built-in clock. It was the first remote control that could be linked to a computer and loaded with updated software code as needed. The CORE unit never made a huge impact on the market. It was much too cumbersome for the average user to program, but it received rave reviews from those who could. These obstacles eventually led to the demise of CL 9, but two of its employees continued the business under the name Celadon. This was one of the first computer-controlled learning remote controls on the market.

In the 1990s, cars were increasingly sold with electronic remote control door locks. These remotes transmit a signal to the car which locks or unlocks the door locks or unlocks the trunk. An aftermarket device sold in some countries is the remote starter. This enables a car owner to remotely start their car. This feature is most associated with countries with winter climates, where users may wish to run the car for several minutes before they intend to use it, so that the car heater and defrost systems can remove ice and snow from the windows.

Proliferation
By the early 2000s, the number of consumer electronic devices in most homes greatly increased, along with the number of remotes to control those devices. According to the Consumer Electronics Association, an average US home has four remotes. To operate a home theater as many as five or six remotes may be required, including one for cable or satellite receiver, VCR or digital video recorder (DVR/PVR), DVD player, TV and audio amplifier. Several of these remotes may need to be used sequentially for some programs or services to work properly. However, as there are no accepted interface guidelines, the process is increasingly cumbersome. One solution used to reduce the number of remotes that have to be used is the universal remote, a remote control that is programmed with the operation codes for most major brands of TVs, DVD players, etc. In the early 2010s, many smartphone manufacturers began incorporating infrared emitters into their devices, thereby enabling their use as universal remotes via an included or downloadable app.

Technique
The main technology used in home remote controls is infrared (IR) light. The signal between a remote control handset and the device it controls consists of pulses of infrared light, which is invisible to the human eye but can be seen through a digital camera, video camera or phone camera. The transmitter in the remote control handset sends out a stream of pulses of infrared light when the user presses a button on the handset. A transmitter is often a light emitting diode (LED) which is built into the pointing end of the remote control handset. The infrared light pulses form a pattern unique to that button. The receiver in the device recognizes the pattern and causes the device to respond accordingly.

Opto components and circuits

Most remote controls for electronic appliances use a near infrared diode to emit a beam of light that reaches the device. A 940 nm wavelength LED is typical. This infrared light is not visible to the human eye but picked up by sensors on the receiving device. Video cameras see the diode as if it produces visible purple light. With a single channel (single-function, one-button) remote control the presence of a carrier signal can be used to trigger a function. For multi-channel (normal multi-function) remote controls more sophisticated procedures are necessary: one consists of modulating the carrier with signals of different frequencies. After the receiver demodulates the received signal, it applies the appropriate frequency filters to separate the respective signals. One can often hear the signals being modulated on the infrared carrier by operating a remote control in very close proximity to an AM radio not tuned to a station. Today, IR remote controls almost always use a pulse width modulated code, encoded and decoded by a digital computer: a command from a remote control consists of a short train of pulses of carrier-present and carrier-not-present of varying widths.

Consumer electronics infrared protocols
Different manufacturers of infrared remote controls use different protocols to transmit the infrared commands. The RC-5 protocol that has its origins within Philips, uses, for instance, a total of 14 bits for each button press. The bit pattern is modulated onto a carrier frequency that, again, can be different for different manufacturers and standards, in the case of RC-5, the carrier is 36 kHz. Other consumer infrared protocols include the various versions of SIRCS used by Sony, the RC-6 from Philips, the Ruwido R-Step, and the NEC TC101 protocol.

Infrared, line of sight and operating angle
Since infrared (IR) remote controls use light, they require line of sight to operate the destination device. The signal can, however, be reflected by mirrors, just like any other light source. If operation is required where no line of sight is possible, for instance when controlling equipment in another room or installed in a cabinet, many brands of IR extenders are available for this on the market. Most of these have an IR receiver, picking up the IR signal and relaying it via radio waves to the remote part, which has an IR transmitter mimicking the original IR control. Infrared receivers also tend to have a more or less limited operating angle, which mainly depends on the optical characteristics of the phototransistor. However, it is easy to increase the operating angle using a matte transparent object in front of the receiver.

Radio remote control systems

Radio remote control (RF remote control) is used to control distant objects using a variety of radio signals transmitted by the remote control device. As a complementary method to infrared remote controls, the radio remote control is used with electric garage door or gate openers, automatic barrier systems, burglar alarms and industrial automation systems. Standards used for RF remotes are: Bluetooth AVRCP, Zigbee (RF4CE), Z-Wave. Most remote controls use their own coding, transmitting from 8 to 100 or more pulses, fixed or Rolling code, using OOK or FSK modulation. Also, transmitters or receivers can be universal, meaning they are able to work with many different codings. In this case, the transmitter is normally called a universal remote control duplicator because it is able to copy existing remote controls, while the receiver is called a universal receiver because it works with almost any remote control in the market.

A radio remote control system commonly has two parts: transmit and receive. The transmitter part is divided into two parts, the RF remote control and the transmitter module. This allows the transmitter module to be used as a component in a larger application. The transmitter module is small, but users must have detailed knowledge to use it; combined with the RF remote control it is much simpler to use.

The receiver is generally one of two types: a super-regenerative receiver or a superheterodyne. The super-regenerative receiver works like that of an intermittent oscillation detection circuit. The superheterodyne works like the one in a radio receiver. The superheterodyne receiver is used because of its stability, high sensitivity and it has relatively good anti-interference ability, a small package and lower price.

Industry
A remote control is used for controlling substations, pump storage power stations and HVDC-plants. For these systems often PLC-systems working in the longwave range are used.

Power line remote control
A subset of Power-Line communication that sends remote control signals over energized AC power lines. This was used to remotely control home automation before the invention of WIFI connected smart switches.

Garage and gate
Garage and gate remote controls are very common, especially in some countries such as the US, Australia, and the UK, where garage doors, gates and barriers are widely used. Such a remote is very simple by design, usually only one button, and some with more buttons to control several gates from one control. Such remotes can be divided into two categories by the encoder type used: fixed code and rolling code. If you find dip-switches in the remote, it is likely to be fixed code, an older technology which was widely used. However, fixed codes have been criticized for their (lack of) security, thus rolling code has been more and more widely used in later installations.

Military
Remotely operated torpedoes were demonstrated in the late 19th century in the form of several types of remotely controlled torpedoes. The early 1870s saw remotely controlled torpedoes by John Ericsson (pneumatic), John Louis Lay (electric wire guided), and Victor von Scheliha (electric wire guided).

The Brennan torpedo, invented by Louis Brennan in 1877 was powered by two contra-rotating propellers that were spun by rapidly pulling out wires from drums wound inside the torpedo. Differential speed on the wires connected to the shore station allowed the torpedo to be guided to its target, making it "the world's first practical guided missile". In 1898 Nikola Tesla publicly demonstrated a "wireless" radio-controlled torpedo that he hoped to sell to the U.S. Navy.

Archibald Low was known as the "father of radio guidance systems" for his pioneering work on guided rockets and planes during the First World War. In 1917, he demonstrated a remote-controlled aircraft to the Royal Flying Corps and in the same year built the first wire-guided rocket. As head of the secret RFC experimental works at Feltham, A. M. Low was the first person to use radio control successfully on an aircraft, an "Aerial Target". It was "piloted" from the ground by future world aerial speed record holder Henry Segrave. Low's systems encoded the command transmissions as a countermeasure to prevent enemy intervention. By 1918 the secret D.C.B. Section of the Royal Navy's Signals School, Portsmouth under the command of Eric Robinson V.C. used a variant of the Aerial Target's radio control system to control from ‘mother’ aircraft different types of naval vessels including a submarine.

The military also developed several early remote control vehicles. In World War I, the Imperial German Navy employed FL-boats (Fernlenkboote) against coastal shipping. These were driven by internal combustion engines and controlled remotely from a shore station through several miles of wire wound on a spool on the boat. An aircraft was used to signal directions to the shore station. EMBs carried a high explosive charge in the bow and traveled at speeds of thirty knots. The Soviet Red Army used remotely controlled teletanks during the 1930s in the Winter War against Finland and the early stages of World War II. A teletank is controlled by radio from a control tank at a distance of 500 to 1,500 meters, the two constituting a telemechanical group. The Red Army fielded at least two teletank battalions at the beginning of the Great Patriotic War. There were also remotely controlled cutters and experimental remotely controlled planes in the Red Army.

Remote controls in military usage employ jamming and countermeasures against jamming. Jammers are used to disable or sabotage the enemy's use of remote controls. The distances for military remote controls also tend to be much longer, up to intercontinental distance satellite-linked remote controls used by the U.S. for their unmanned airplanes (drones) in Afghanistan, Iraq, and Pakistan. Remote controls are used by insurgents in Iraq and Afghanistan to attack coalition and government troops with roadside improvised explosive devices, and terrorists in Iraq are reported in the media to use modified TV remote controls to detonate bombs.

Space
In the winter of 1971, the Soviet Union explored the surface of the Moon with the lunar vehicle Lunokhod 1, the first roving remote-controlled robot to land on another celestial body. Remote control technology is also used in space travel, for instance, the Soviet Lunokhod vehicles were remote-controlled from the ground. Many space exploration rovers can be remotely controlled, though vast distance to a vehicle results in a long time delay between transmission and receipt of a command.

PC control
Existing infrared remote controls can be used to control PC applications. Any application that supports shortcut keys can be controlled via infrared remote controls from other home devices (TV, VCR, AC). This is widely used with multimedia applications for PC based home theater systems. For this to work, one needs a device that decodes IR remote control data signals and a PC application that communicates to this device connected to PC. A connection can be made via serial port, USB port or motherboard IrDA connector. Such devices are commercially available but can be homemade using low-cost microcontrollers. LIRC (Linux IR Remote control) and WinLIRC (for Windows) are software packages developed for the purpose of controlling PC using TV remote and can be also used for homebrew remote with lesser modification.

Photography
Remote controls are used in photography, in particular to take long-exposure shots. Many action cameras such as the GoPros as well as standard DSLRs including Sony's Alpha series incorporate Wi-Fi based remote control systems. These can often be accessed and even controlled via cell-phones and other mobile devices.

Video games
Video game consoles had not used wireless controllers until recently, mainly because of the difficulty involved in playing the game while keeping the infrared transmitter pointed at the console. Early wireless controllers were cumbersome and when powered on alkaline batteries, lasted only a few hours before they needed replacement. Some wireless controllers were produced by third parties, in most cases using a radio link instead of infrared. Even these were very inconsistent, and in some cases, had transmission delays, making them virtually useless. Some examples include the Double Player for NES, the Master System Remote Control System and the Wireless Dual Shot for the PlayStation.

The first official wireless game controller made by a first party manufacturer was the CX-42 for Atari 2600. The Philips CD-i 400 series also came with a remote control, the WaveBird was also produced for the GameCube. In the seventh generation of gaming consoles, wireless controllers became standard. Some wireless controllers, such as those of the PlayStation 3 and Wii, use Bluetooth. Others, like the Xbox 360, use proprietary wireless protocols.

Standby power
To be turned on by a wireless remote, the controlled appliance must always be partly on, consuming standby power.

Alternatives
Hand-gesture recognition has been researched as an alternative to remote controls for television sets.

title: Remote control


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Battle of Naseby

The Battle of Naseby took place on 14 June 1645 during the First English Civil War, near the village of Naseby in Northamptonshire. The Parliamentarian New Model Army, commanded by Sir Thomas Fairfax and Oliver Cromwell, destroyed the main Royalist army under Charles I and Prince Rupert. The defeat ended any real hope of royalist victory, although Charles did not finally surrender until May 1646.

The 1645 campaign began in April when the newly formed New Model Army marched west to relieve Taunton, before being ordered back to lay siege to Oxford, the Royalist wartime capital. On 31 May, the Royalists stormed Leicester and Fairfax was instructed to abandon the siege and engage them. Although heavily outnumbered, Charles decided to stand and fight and after several hours of combat, his force was effectively destroyed. The Royalists suffered over 1,000 casualties, with over 4,500 of their infantry captured and paraded through the streets of London; they would never again field an army of comparable quality.

They also lost all their artillery and stores, along with Charles' personal baggage and private papers, which revealed his attempts to bring the Irish Catholic Confederation and foreign mercenaries into the war. These were published in a pamphlet titled The King's Cabinet Opened, whose appearance was a great boost to the cause of Parliament.

Background
In July 1644, a Parliamentarian force under Sir Thomas Fairfax and Oliver Cromwell secured control of Northern England by victory at Marston Moor. However, this was offset first by defeat at Lostwithiel in September, then lack of decisiveness at the Second Battle of Newbury in October. The two commanders involved, Essex and Manchester, were accused by many in Parliament of lacking commitment, a group that included moderates like Sir William Waller as well as radicals like Cromwell.

In December, Sir Henry Vane introduced the Self-denying Ordinance, requiring any military officers to resign from Parliament. As members of the House of Lords, Manchester and Essex were automatically removed since unlike MPs they could not resign their titles, although they could be re-appointed, 'if Parliament approved.' It also led to the creation of the New Model Army, a centralised, professional force. Moderates Fairfax and Philip Skippon were appointed Commander-in-Chief and head of the infantry, respectively; Cromwell remained an MP but was given command of the cavalry on a 'temporary' three-month commission, constantly renewed.

At the outset of 1645, the Royalist high command was divided on strategy. Prince Rupert of the Rhine, recently appointed senior commander, wanted to link up with his brother Prince Maurice at Chester and retake the north, a key source of recruits and supplies. A faction headed by Lord Digby considered the New Model a threat to their capital at Oxford, while a third group preferred to consolidate control of the West Country. On 30 April, Fairfax marched west to relieve the Parliamentarian stronghold of Taunton; Lord Goring was despatched with 3,000 cavalry to support the Siege of Taunton, while the main Royalist field army of 8,600 men under Charles I and Prince Rupert moved north.

Concerned by this threat, Parliament's Committee of Both Kingdoms ordered Fairfax to change his plans and besiege Oxford. Although he made little progress, by the end of May the town was running short of provisions and to relieve the pressure, the Royalists stormed the Parliamentarian-held town of Leicester on 31 May, allegedly killing over 700 soldiers and civilians. Alarmed by this, Parliament instructed Fairfax to abandon the siege and on 5 June he marched north to engage the Royalist army. Unlike Prince Rupert who had been beaten by Fairfax and Cromwell the previous summer, Digby and Charles dismissed the fighting capabilities of the New Model. Despite being seriously outnumbered, they were eager for battle; messages were sent ordering Goring to rejoin them, but he refused to leave the West Country.

On 12 June, the Royalists were alerted to the presence of the New Model when Parliamentarian patrols clashed with their outposts near Daventry. The next day, Fairfax was reinforced by Cromwell's cavalry and troops from the Eastern Association under Edward Rossiter, bringing his numbers up to 14,000. Although Prince Rupert favoured withdrawing, Digby convinced Charles that retreat would be bad for morale and they decided to stand and fight.

Battle

The morning of 14 June was foggy, preventing the opposing armies from sighting each other across the battlefield. The Royalists occupied a strong position on a ridge between the villages of Little Oxendon and East Farndon about 2 mi south of Market Harborough. The Royalist scoutmaster, Sir Francis Ruce, was sent out to find the Parliamentarian army and rode south for 2 or but saw no sign of it, perhaps through negligence. Rupert himself moved forward and saw some Parliamentarian cavalry, apparently retiring. He was determined to secure the commanding Naseby ridge and ordered the Royalist army to advance.

Fairfax initially considered occupying the northern slopes of Naseby ridge. Cromwell believed that this position was too strong, and that the Royalists would refuse battle rather than attack it. He is said to have sent a message to Fairfax, saying, "I beseech you, withdraw to yonder hill, which may provoke the enemy to charge us". Fairfax agreed, and moved his army back slightly.

The Royalists did not see Fairfax's position until they reached the village of Clipston, just over a mile north of Naseby ridge. It was clearly impossible for the Royalists to withdraw to their original position without being attacked by the Parliamentarian cavalry while on the line of march and therefore at a disadvantage. Rupert deployed the army to its right, where the ground appeared to be more favourable for his own cavalry and prepared for battle.

Royalists
The Royalists occupied a front of about a mile and a half, between the Clipston-Naseby track on the left and the Sulby Hedges on the right. Their right wing consisted of between 2,000 and 3,000 cavalry under Prince Rupert and his brother Prince Maurice. The centre was commanded by Lord Astley and organised as three infantry brigades or tertias under Sir George Lisle, Henry Bard and Astley's son, Sir Bernard Astley, with a regiment of horse under Colonel Howard in support. On the left under Sir Marmaduke Langdale were 1,500 "Northern Horse", the remnants of cavalry regiments which had escaped from Marston Moor. Charles commanded a small reserve, consisting of his own and Rupert's regiments of foot (800 in total) and his lifeguard of horse.

Parliamentarians

Fairfax had drawn up his army on the ridge a mile north of Naseby, although some of it was behind the crest on the reverse slope. Ireton's wing of five and a half regiments of cavalry was on the left. The infantry under Sergeant-Major General Sir Philip Skippon was in the centre with five regiments on the front line and three in support. A forlorn hope of 300 musketeers was deployed to the front, with a reserve provided by two companies of Colonel Edward Harley's regiment, commanded by its Lieutenant Colonel Thomas Pride. A Parliamentarian engraving of the battle shows 11 pieces of artillery, in the intervals between the infantry regiments. They played little part in the battle; their first salvoes went high, and the Royalist and Parliamentarian infantry were subsequently too closely engaged for the guns to be used. Cromwell's wing, with six and a half regiments of cavalry, was on the right.

The Parliamentarian army occupied a front about 2 mi long. They outflanked the Royalist left, but their own left flank rested, like the Royalists' right flank, on the Sulby Hedges. At the last minute, as the Royalists began to advance, Cromwell sent a regiment of dragoons under Colonel John Okey into the Sulby Hedges, where they could fire into the flank of Rupert's cavalry. The number of dragoons has generally been reported as their official strength of 1,000 but an analysis of pay warrants shows it was no more than 676 in total.

Action
The Royalist centre attacked first, with Rupert keeping his own wing of cavalry in hand so that the horse and foot could hit the enemy simultaneously. Skippon's infantry moved forward over the crest of the ridge to meet the Royalist foot. There was time for only one volley of musketry before both sides were fighting hand-to-hand, the veteran Royalist infantry using their swords and the butt ends of their muskets. Sir Edward Walker, Charles's secretary of war, stated "The Foot on either side hardly saw each other until they were within Carabine Shot, and so made only one Volley; our falling in with Sword and butt end of the Musquet did notable Execution, so much as I saw their Colours fall and their Foot in great Disorder." [sic] Skippon was wounded by a bullet which splintered his armour and struck him under the ribs, although he stayed on the field to prevent panic from spreading. Even so, the Parliamentarians were hard-pressed and forced back.

On the Parliamentarian left, the opposing wings of horse paused briefly to dress ranks before charging into each other. Henry Ireton's own regiment repulsed their Royalist opposite numbers, but Ireton then led at least part of them to the aid of the beleaguered Parliamentarian infantry. His troopers were driven off by Royalist pikemen, and Ireton himself was unhorsed, wounded in the leg and face and taken prisoner. At the same time, the second line of Royalist cavalry broke most of the Parliamentarian horsemen. Some of Ireton's regiments, on the far left, were saved from destruction by the fire from Okey's dragoons, but the others broke and fled, some of them not stopping until they reached Northampton, 15 mi away. The entire Royalist right wing had been committed to defeating Ireton, and none were left in reserve. Rupert either neglected or was unable to rally the cavalier horsemen, who galloped off the battlefield in pursuit of the fleeing Parliamentarians.

Meanwhile, the Parliamentarian right wing of horse under Cromwell and the Royalist Northern Horse faced each other, neither willing to charge to the aid of their infantry while the other could threaten their flank. Eventually, after half an hour, the Royalist cavalry began to charge and Cromwell's troops moved to meet them. Langdale's men were not only outflanked and outnumbered two to one, but forced to charge up a slope broken up by bushes and a rabbit warren. After a brief contest, they were routed.

Unlike Rupert, Cromwell had roughly half of his wing uncommitted, as only the front line of Cromwell's wing had taken part in the defeat of Langdale. He sent only four divisions (roughly two regiments) after Langdale, and turned his reserves against the left flank and rear of the Royalist centre. At about the same time, Okey's dragoons mounted their horses and charged from the Sulby Hedges against the right wing of the Royalist infantry, as did some of Ireton's regiments which had partly rallied.

Some of the trapped Royalist infantry began to throw down their arms and call for quarter; others tried to conduct a fighting retreat. One regiment, apparently Rupert's "Bluecoats", stood their ground and repulsed all attacks. One eyewitness said "The Blue regiment of the Kings stood to it very stoutly, and stirred not, like a wall of brasse...". [sic] Eventually, Fairfax led his own regiment of foot and horse against them, breaking their resistance, with Fairfax reportedly capturing their standard himself. Archaeological evidence, chiefly recovered musket balls, suggests this episode took place in the vicinity of Long Hold Spinney, about 1 km behind the original Royalist positions.

At some stage, the King attempted to lead his lifeguard of horse to the rescue of his centre or in a counter-attack against Cromwell's troopers, but was prevented from doing so by a Scottish nobleman, the Earl of Carnwath, who seized his bridle and said, "Would you go upon your death, Sire?" Seeing the King swerve away from the enemy, his lifeguard also retreated in disorder for several hundred yards. Meanwhile, Rupert's cavalry had reached Naseby and the Parliamentarian baggage, whose escort refused to surrender and drove them off. Although Rupert rallied his men and returned to the battlefield, it was now too late to save the remnants of their infantry, and he could not induce his cavalry to make another charge. Fairfax halted and reorganised his lines, and when he resumed his advance, the Royalist cavalry withdrew.

Fairfax's forces pursued survivors fleeing north towards Leicester. Archaeological evidence suggests fugitives and Royalist baggage guards tried to rally on the slopes of Castle Yard (also known as Wadborough Hill), a wooded hill with the ruins of a motte and bailey castle, about 1.5 mi behind the original battle line. Many Royalists were slaughtered when they mistakenly followed what they thought was the main road to Leicester into the churchyard in the village of Marston Trussell, and were unable to escape their pursuers. In the aftermath of the battle, Parliamentarian troops reportedly killed at least 100 female camp followers and mutilated many others. This was supposedly done in the belief they were Irish, though the women were probably Welsh whose language was mistaken for Irish.

Aftermath

Fairfax recovered Leicester on 18 June. He immediately led his army southwest to relieve Taunton and capture the Royalist-held West Country. The Royalist forces surrendered at Truro in Cornwall, while leading Royalist commanders, including Lord Hopton, the Prince of Wales, Sir Edward Hyde, and Lord Capell, fled to Jersey from Falmouth.

The main Royalist military force had been shattered at Naseby. The King had lost his veteran infantry (including 500 officers), all his artillery, and many arms. He lacked the resources to create an army of such quality again, and after Naseby, it simply remained for the Parliamentarian armies to wipe out the last pockets of Royalist resistance. Charles hoped to rebuild his army with new recruits from Wales and the border counties and headed in that direction. He also had expectations that reinforcements might arrive from Ireland. The Committee of Both Kingdoms responded on 28 June by ordering Leven's Scottish Covenanters to move to strike at the Royalist stronghold of Hereford. The ensuing Siege of Hereford by Covenanter forces ended in failure, but in December of the same year, Hereford was seized by John Birch in a surprise attack.

The Parliamentarians had also captured the King's personal baggage, with correspondence which showed he intended to seek support from the Irish Catholic Confederation through the Cessation Treaty, and Catholic nations in Europe. By publishing this correspondence, entitled The King's Cabinet Opened, Parliament gained much support in favour of fighting the war to a finish. Within a year, the first civil war ended in a Parliamentarian military victory.

In fiction

 * The battle features in the earlier part of Rosemary Sutcliff's historical novel Simon
 * Colonel Beverley, the father of the orphaned family in Captain Marryat's The Children of the New Forest, was killed at Naseby.
 * The battle serves as the historical background to a series of murders in the episode "The Dark Rider" of the TV series Midsomer Murders.
 * In Arthur Conan Doyle's Sherlock Holmes short story The Adventure of the Musgrave Ritual, where Brunton corrects Sir Reginald Musgrave about his ancestor, Sir Roland Musgrave's boot being worn at Naseby.
 * The battle is depicted in Catherine Darby's novel A Game of Falcons in which two neighbours from a village in Kent, fighting on opposite sides, encounter each other in the middle of the battle.
 * The father of Alison, wife of the protagonist in Robert Neill's Burnaby Trilogy, was killed in Naseby.
 * Lord Macaulay's poem "The Battle of Naseby".
 * A fictional account of the battle is portrayed in the 1970 film Cromwell. The dialog of the film portrays the Parliamentarian forces as being significantly outnumbered by Royalists, in a reverse of the actual conditions.
 * The aftermath of the battle is depicted in series 1, episode 6 of By the Sword Divided, in which the King and his retinue shelter after the battle at fictional Arnescote manor, home of the protagonists.

license: Creative Commons - Attribution Share-Alike - https://creativecommons.org/licenses/by-sa/4.0/

title: Battle of Naseby


text:
User:Nwt

wikipedia...because I've got procrastinating to be doing!

taken from here to where it came from...

Entries I originated/wrote (many further developed since then):

 * Académie Française
 * Agre, Peter
 * amicus curiae
 * Axel, Richard
 * Bonifacio
 * Buck, Linda B.
 * Ciechanover, Aaron
 * Convention on International Civil Aviation or Chicago Convention
 * ''Double Negative
 * Dred Scott v. Sandford
 * Heizer, Michael
 * Hershko, Avram
 * Joint United Nations Programme on HIV/AIDS or UNAIDS
 * Lawrence v. Texas
 * Maathai, Wangari
 * Nat, Marie-José
 * Olson, Theodore
 * Poses
 * Rose, Irwin
 * Scott, Dred
 * United States Solicitor General
 * Want Two
 * Wilkins, Maurice

Entries I added to significantly enough that I want to mention them:

 * Rufus Wainwright
 * Calatrava, Santiago
 * Geneva
 * Franklin, Rosalind
 * Milwaukee Art Museum
 * Saarinen, Eero
 * Sagan, Carl
 * University of Chicago
 * Watson, James
 * Bell Atlantic Corp. v. Twombly

title: User:Nwt


text:
Infectious mononucleosis

Infectious mononucleosis (IM, mono), also known as glandular fever, is an infection usually caused by the Epstein–Barr virus (EBV). Most people are infected by the virus as children, when the disease produces few or no symptoms. In young adults, the disease often results in fever, sore throat, enlarged lymph nodes in the neck, and fatigue. Most people recover in two to four weeks; however, feeling tired may last for months. The liver or spleen may also become swollen, and in less than one percent of cases splenic rupture may occur.

While usually caused by the Epstein–Barr virus, also known as human herpesvirus 4, which is a member of the herpesvirus family, a few other viruses and the protozoon Toxoplasma gondii may also cause the disease. It is primarily spread through saliva but can rarely be spread through semen or blood. Spread may occur by objects such as drinking glasses or toothbrushes or through a cough or sneeze. Those who are infected can spread the disease weeks before symptoms develop. Mono is primarily diagnosed based on the symptoms and can be confirmed with blood tests for specific antibodies. Another typical finding is increased blood lymphocytes of which more than 10% are atypical. The monospot test is not recommended for general use due to poor accuracy.

There is no vaccine for EBV; however, there is ongoing research. Infection can be prevented by not sharing personal items or saliva with an infected person. Mono generally improves without any specific treatment. Symptoms may be reduced by drinking enough fluids, getting sufficient rest, and taking pain medications such as paracetamol (acetaminophen) and ibuprofen.

Mononucleosis most commonly affects those between the ages of 15 and 24 years in the developed world. In the developing world, people are more often infected in early childhood when there are fewer symptoms. In those between 16 and 20 it is the cause of about 8% of sore throats. About 45 out of 100,000 people develop infectious mono each year in the United States. Nearly 95% of people have had an EBV infection by the time they are adults. The disease occurs equally at all times of the year. Mononucleosis was first described in the 1920s and is colloquially known as "the kissing disease".

Signs and symptoms
The signs and symptoms of infectious mononucleosis vary with age.

Children
Before puberty, the disease typically only produces flu-like symptoms, if any at all. When found, symptoms tend to be similar to those of common throat infections (mild pharyngitis, with or without tonsillitis).

Adolescents and young adults
In adolescence and young adulthood, the disease presents with a characteristic triad:
 * Fever – usually lasting 14 days; often mild
 * Sore throat – usually severe for 3–5 days, before resolving in the next 7–10 days.
 * Swollen glands – mobile; usually located around the back of the neck (posterior cervical lymph nodes) and sometimes throughout the body.

Another major symptom is feeling tired. Headaches are common, and abdominal pains with nausea or vomiting sometimes also occur. Symptoms most often disappear after about 2–4 weeks. However, fatigue and a general feeling of being unwell (malaise) may sometimes last for months. Fatigue lasts more than one month in an estimated 28% of cases. Mild fever, swollen neck glands and body aches may also persist beyond 4 weeks. Most people are able to resume their usual activities within 2–3 months.

The most prominent sign of the disease is often the pharyngitis, which is frequently accompanied by enlarged tonsils with pus—an exudate similar to that seen in cases of strep throat. In about 50% of cases, small reddish-purple spots called petechiae can be seen on the roof of the mouth. Palatal enanthem can also occur, but is relatively uncommon.

A small minority of people spontaneously present a rash, usually on the arms or trunk, which can be macular (morbilliform) or papular. Almost all people given amoxicillin or ampicillin eventually develop a generalized, itchy maculopapular rash, which however does not imply that the person will have adverse reactions to penicillins again in the future. Occasional cases of erythema nodosum and erythema multiforme have been reported. Seizures may also occasionally occur.

Complications
Spleen enlargement is common in the second and third weeks, although this may not be apparent on physical examination. Rarely the spleen may rupture. There may also be some enlargement of the liver. Jaundice occurs only occasionally.

It generally gets better on its own in people who are otherwise healthy. When caused by EBV, infectious mononucleosis is classified as one of the Epstein–Barr virus–associated lymphoproliferative diseases. Occasionally the disease may persist and result in a chronic infection. This may develop into systemic EBV-positive T cell lymphoma.

Older adults
Infectious mononucleosis mainly affects younger adults. When older adults do catch the disease, they less often have characteristic signs and symptoms such as the sore throat and lymphadenopathy. Instead, they may primarily experience prolonged fever, fatigue, malaise and body pains. They are more likely to have liver enlargement and jaundice. People over 40 years of age are more likely to develop serious illness.

Incubation period
The exact length of time between infection and symptoms is unclear. A review of the literature made an estimate of 33–49 days. In adolescents and young adults, symptoms are thought to appear around 4–6 weeks after initial infection. Onset is often gradual, though it can be abrupt. The main symptoms may be preceded by 1–2 weeks of fatigue, feeling unwell and body aches.

Epstein–Barr virus
About 90% of cases of infectious mononucleosis are caused by the Epstein–Barr virus, a member of the Herpesviridae family of DNA viruses. It is one of the most commonly found viruses throughout the world. Contrary to common belief, the Epstein–Barr virus is not highly contagious. It can only be contracted through direct contact with an infected person's saliva, such as through kissing or sharing toothbrushes. About 95% of the population has been exposed to this virus by the age of 40, but only 15–20% of teenagers and about 40% of exposed adults actually develop infectious mononucleosis.

Cytomegalovirus
About 5–7% of cases of infectious mononucleosis is caused by human cytomegalovirus (CMV), another type of herpes virus. This virus is found in body fluids including saliva, urine, blood, tears, breast milk and genital secretions. A person becomes infected with this virus by direct contact with infected body fluids. Cytomegalovirus is most commonly transmitted through kissing and sexual intercourse. It can also be transferred from an infected mother to her unborn child. This virus is often "silent" because the signs and symptoms cannot be felt by the person infected. However, it can cause life-threatening illness in infants, people with HIV, transplant recipients, and those with weak immune systems. For those with weak immune systems, cytomegalovirus can cause more serious illnesses such as pneumonia and inflammations of the retina, esophagus, liver, large intestine, and brain. Approximately 90% of the human population has been infected with cytomegalovirus by the time they reach adulthood, but most are unaware of the infection. Once a person becomes infected with cytomegalovirus, the virus stays in their body throughout the person's lifetime. During this latent phase, the virus can be detected only in monocytes.

Other causes
Toxoplasma gondii, a parasitic protozoon, is responsible for less than 1% of the infectious mononucleosis cases. Viral hepatitis, adenovirus, rubella, and herpes simplex viruses have also been reported as rare causes of infectious mononucleosis.

Transmission
Epstein–Barr virus infection is spread via saliva, and has an incubation period of four to seven weeks. The length of time that an individual remains contagious is unclear, but the chances of passing the illness to someone else may be the highest during the first six weeks following infection. Some studies indicate that a person can spread the infection for many months, possibly up to a year and a half.

Pathophysiology
The virus replicates first within epithelial cells in the pharynx (which causes pharyngitis, or sore throat), and later primarily within B cells (which are invaded via their CD21). The host immune response involves cytotoxic (CD8-positive) T cells against infected B lymphocytes, resulting in enlarged, atypical lymphocytes (Downey cells).

When the infection is acute (recent onset, instead of chronic), heterophile antibodies are produced.

Cytomegalovirus, adenovirus and Toxoplasma gondii (toxoplasmosis) infections can cause symptoms similar to infectious mononucleosis, but a heterophile antibody test will test negative and differentiate those infections from infectious mononucleosis.

Mononucleosis is sometimes accompanied by secondary cold agglutinin disease, an autoimmune disease in which abnormal circulating antibodies directed against red blood cells can lead to a form of autoimmune hemolytic anemia. The cold agglutinin detected is of anti-i specificity.

Diagnosis

The disease is diagnosed based on:

Physical examination
The presence of an enlarged spleen, and swollen posterior cervical, axillary, and inguinal lymph nodes are the most useful to suspect a diagnosis of infectious mononucleosis. On the other hand, the absence of swollen cervical lymph nodes and fatigue are the most useful to dismiss the idea of infectious mononucleosis as the correct diagnosis. The insensitivity of the physical examination in detecting an enlarged spleen means it should not be used as evidence against infectious mononucleosis. A physical examination may also show petechiae in the palate.

Heterophile antibody test
The heterophile antibody test, or monospot test, works by agglutination of red blood cells from guinea pigs, sheep and horses. This test is specific but not particularly sensitive (with a false-negative rate of as high as 25% in the first week, 5–10% in the second, and 5% in the third). About 90% of diagnosed people have heterophile antibodies by week 3, disappearing in under a year. The antibodies involved in the test do not interact with the Epstein–Barr virus or any of its antigens.

The monospot test is not recommended for general use by the CDC due to its poor accuracy.

Serology
Serologic tests detect antibodies directed against the Epstein–Barr virus. Immunoglobulin G (IgG), when positive, mainly reflects a past infection, whereas immunoglobulin M (IgM) mainly reflects a current infection. EBV-targeting antibodies can also be classified according to which part of the virus they bind to:
 * Viral capsid antigen (VCA):
 * Anti-VCA IgM appear early after infection, and usually, disappear within 4 to 6 weeks.
 * Anti-VCA IgG appears in the acute phase of EBV infection, reaches a maximum at 2 to 4 weeks after onset of symptoms and thereafter declines slightly and persists for the rest of a person’s life.

 * Early antigen (EA)
 * Anti-EA IgG appears in the acute phase of illness and disappears after 3 to 6 months. It is associated with having an active infection. Yet, 20% of people may have antibodies against EA for years despite having no other sign of infection.

 * EBV nuclear antigen (EBNA)
 * Antibody to EBNA slowly appears 2 to 4 months after the onset of symptoms and persists for the rest of a person’s life.

When negative, these tests are more accurate than the heterophile antibody test in ruling out infectious mononucleosis. When positive, they feature similar specificity to the heterophile antibody test. Therefore, these tests are useful for diagnosing infectious mononucleosis in people with highly suggestive symptoms and a negative heterophile antibody test.

Other tests

 * Elevated hepatic transaminase levels are highly suggestive of infectious mononucleosis, occurring in up to 50% of people.
 * By blood film, one diagnostic criterion for infectious mononucleosis is the presence of 50% lymphocytes with at least 10% atypical lymphocytes (large, irregular nuclei), while the person also has fever, pharyngitis, and swollen lymph nodes. The atypical lymphocytes resembled monocytes when they were first discovered, thus the term "mononucleosis" was coined.
 * A fibrin ring granuloma may be present in the liver or bone marrow.

Differential diagnosis
About 10% of people who present a clinical picture of infectious mononucleosis do not have an acute Epstein–Barr-virus infection. A differential diagnosis of acute infectious mononucleosis needs to take into consideration acute cytomegalovirus infection and Toxoplasma gondii infections. Because their management is much the same, it is not always helpful–or possible–to distinguish between Epstein–Barr-virus mononucleosis and cytomegalovirus infection. However, in pregnant women, differentiation of mononucleosis from toxoplasmosis is important, since it is associated with significant consequences for the fetus.

Acute HIV infection can mimic signs similar to those of infectious mononucleosis, and tests should be performed for pregnant women for the same reason as toxoplasmosis.

People with infectious mononucleosis are sometimes misdiagnosed with a streptococcal pharyngitis (because of the symptoms of fever, pharyngitis and adenopathy) and are given antibiotics such as ampicillin or amoxicillin as treatment.

Other conditions from which to distinguish infectious mononucleosis include leukemia, tonsillitis, diphtheria, common cold and influenza (flu).

Treatment
Infectious mononucleosis is generally self-limiting, so only symptomatic or supportive treatments are used. The need for rest and return to usual activities after the acute phase of the infection may reasonably be based on the person's general energy levels. Nevertheless, in an effort to decrease the risk of splenic rupture, experts advise avoidance of contact sports and other heavy physical activity, especially when involving increased abdominal pressure or the Valsalva maneuver (as in rowing or weight training), for at least the first 3–4 weeks of illness or until enlargement of the spleen has resolved, as determined by a treating physician.

Medications
Paracetamol (acetaminophen) and NSAIDs, such as ibuprofen, may be used to reduce fever and pain. Prednisone, a corticosteroid, while used to try to reduce throat pain or enlarged tonsils, remains controversial due to the lack of evidence that it is effective and the potential for side effects. Intravenous corticosteroids, usually hydrocortisone or dexamethasone, are not recommended for routine use but may be useful if there is a risk of airway obstruction, a very low platelet count, or hemolytic anemia.

Antiviral agents act by inhibiting viral DNA replication. There is little evidence to support the use of antivirals such as aciclovir and valacyclovir although they may reduce initial viral shedding. Antivirals are expensive, risk causing resistance to antiviral agents, and (in 1% to 10% of cases) can cause unpleasant side effects. Although antivirals are not recommended for people with simple infectious mononucleosis, they may be useful (in conjunction with steroids) in the management of severe EBV manifestations, such as EBV meningitis, peripheral neuritis, hepatitis, or hematologic complications.

Although antibiotics exert no antiviral action they may be indicated to treat bacterial secondary infections of the throat, such as with streptococcus (strep throat). However, ampicillin and amoxicillin are not recommended during acute Epstein–Barr virus infection as a diffuse rash may develop.

Observation
Splenomegaly is a common symptom of infectious mononucleosis and health care providers may consider using abdominal ultrasonography to get insight into the enlargement of a person's spleen. However, because spleen size varies greatly, ultrasonography is not a valid technique for assessing spleen enlargement and should not be used in typical circumstances or to make routine decisions about fitness for playing sports.

Prognosis
Serious complications are uncommon, occurring in less than 5% of cases:
 * CNS complications include meningitis, encephalitis, hemiplegia, Guillain–Barré syndrome, and transverse myelitis. Prior infectious mononucleosis has been linked to the development of multiple sclerosis.
 * Hematologic: Hemolytic anemia (direct Coombs test is positive) and various cytopenias, and bleeding (caused by thrombocytopenia) can occur.
 * Mild jaundice
 * Hepatitis with the Epstein–Barr virus is rare.
 * Upper airway obstruction from tonsillar hypertrophy is rare.
 * Fulminant disease course of immunocompromised people are rare.
 * Splenic rupture is rare.
 * Myocarditis and pericarditis are rare.
 * Postural orthostatic tachycardia syndrome
 * Myalgic encephalomyelitis/chronic fatigue syndrome
 * Cancers associated with the Epstein–Barr virus include Burkitt's lymphoma, Hodgkin's lymphoma and lymphomas in general as well as nasopharyngeal and gastric carcinoma.
 * Hemophagocytic lymphohistiocytosis

Once the acute symptoms of an initial infection disappear, they often do not return. But once infected, the person carries the virus for the rest of their life. The virus typically lives dormant in B lymphocytes. Independent infections of mononucleosis may be contracted multiple times, regardless of whether the person is already carrying the virus dormant. Periodically, the virus can reactivate, during which time the person is again infectious, but usually without any symptoms of illness. Usually, a person with IM has few, if any, further symptoms or problems from the latent B lymphocyte infection. However, in susceptible hosts under the appropriate environmental stressors, the virus can reactivate and cause vague physical symptoms (or may be subclinical), and during this phase, the virus can spread to others.

History
The characteristic symptomatology of infectious mononucleosis does not appear to have been reported until the late nineteenth century. In 1885, the renowned Russian pediatrician Nil Filatov reported an infectious process he called "idiopathic adenitis" exhibiting symptoms that correspond to infectious mononucleosis, and in 1889 a German balneologist and pediatrician, Emil Pfeiffer, independently reported similar cases (some of lesser severity) that tended to cluster in families, for which he coined the term Drüsenfieber ("glandular fever").

The word mononucleosis has several senses, but today it usually is used in the sense of infectious mononucleosis, which is caused by EBV.

The term "infectious mononucleosis" was coined in 1920 by Thomas Peck Sprunt and Frank Alexander Evans in a classic clinical description of the disease published in the Bulletin of the Johns Hopkins Hospital, entitled "Mononuclear leukocytosis in reaction to acute infection (infectious mononucleosis)". A lab test for infectious mononucleosis was developed in 1931 by Yale School of Public Health Professor John Rodman Paul and Walls Willard Bunnell based on their discovery of heterophile antibodies in the sera of persons with the disease. The Paul-Bunnell Test or PBT was later replaced by the heterophile antibody test.

The Epstein–Barr virus was first identified in Burkitt's lymphoma cells by Michael Anthony Epstein and Yvonne Barr at the University of Bristol in 1964. The link with infectious mononucleosis was uncovered in 1967 by Werner and Gertrude Henle at the Children's Hospital of Philadelphia, after a laboratory technician handling the virus contracted the disease: comparison of serum samples collected from the technician before and after the onset revealed development of antibodies to the virus.

Yale School of Public Health epidemiologist Alfred E. Evans confirmed through testing that mononucleosis was transmitted mainly through kissing, leading to it being referred to colloquially as "the kissing disease".

title: Infectious mononucleosis


text:
Tijuana International Airport

Tijuana International Airport (Aeropuerto Internacional de Tijuana); officially Aeropuerto Internacional General Abelardo L. Rodríguez (General Abelardo L. Rodríguez  International Airport), is an international airport located 5 km northeast of Downtown Tijuana. It serves Tijuana, Baja California, Mexico, and the Metropolitan Area of San Diego–Tijuana, home to a population of five million inhabitants. The airport serves an extensive network of 42 domestic destinations including most of the major and secondary cities across Mexico. It is a hub for Volaris and a focus city for Viva Aerobus. Additionally, the airport houses facilities for the Mexican Air Force and supports cargo flights, tourism, flight training, and general aviation activities. Operated by Grupo Aeroportuario del Pacífico, the airport is named after General Abelardo L. Rodríguez, President of Mexico from 1932 to 1934. It is Mexico's westernmost airport and second-northernmost airport after Mexicali International Airport.

Situated adjacent to the U.S. border, Tijuana Airport is the only geographically binational airport in the world, having direct access to its terminal from Mexico, and from its Cross Border Xpress (CBX) terminal in the United States. This unique feature allows passengers with a boarding pass to walk across a bridge crossing the U.S.-Mexico border. The CBX terminal handled 4,288,000 passengers in 2023, constituting approximately one-third of all passenger movements at Tijuana Airport.

The airport ranks as the fifth busiest airport in Mexico for both passenger numbers and aircraft movements and holds the 13th position in Latin America and the 55th position in North America. It has witnessed significant growth, handling 8,925,900 passengers in 2019 and reaching 13,194,900 passengers in 2023. In 2022, Tijuana International Airport became the fifth airport in the country to surpass ten million passengers in a calendar year.

Early years
Tijuana Airport, inaugurated as the ' Aeropuerto Federal de Tijuana' on May 1, 1951, replaced the former airport located on today's Aguacaliente Boulevard. The initial passenger terminal was situated on the southwest side of the airport grounds, facing the present terminal. In 1954, Mexicana de Aviación began direct flights from Tijuana to Mexico City. In 1965, as part of the National Plan of Airports introduced during President Diaz Ordaz's administration, the airport became part of the Government-owned corporation Aeropuertos y Servicios Auxiliares (ASA). The growing population in Tijuana during the 1960s led to an increased demand for flights.

The airport's 2000 m long runway, with an orientation of 10/28, had its northern end located less than 100 m south of the U.S. border wall. This meant that departing airplanes entered U.S. airspace after takeoff. The year 1969 marked the introduction of Operation Intercept, aimed at curbing narcotics flow between the U.S. and Mexico. Rising political pressure to reduce incursions into U.S. airspace resulted in the requirement to reorient the runway from 10/28 to 09/27.

In 1970, a new 2500 m long runway (09/27) and a terminal capable of accommodating larger aircraft were constructed north of the existing runway. The new runway direction impacted Tijuana's approach, particularly over Cerro San Isidro, a 792 m high land obstacle, causing an increase in the east approach glide slope beyond 3 degrees and hindering a full Instrument Landing System (ILS) approach on runway 27, necessary during adverse weather conditions.

The original terminal then transitioned into an air base for the Mexican Air Force, now known as the ' Aeropuerto Viejo' or old airport. During the 1970s, Tijuana experienced rapid growth, leading to expansions in both terminal and parking areas to meet escalating airport demand.

Privatization
In the 1980s, both terminal space and passenger parking at Tijuana Airport became insufficient to meet demand. In 1990, Mexico initiated its first two 10-year joint ventures with private investors. One of the initial projects involved expanding both the departure concourse and parking areas.

The year 1995 marked a significant change with the publication of the  'Ley de Aeropuertos' (Airports Law) by the Department of Communications and Transportation (Secretaría de Comunicaciones y Transporte), marking the beginning of Mexico's airport privatization program. In 1999, Tijuana Airport joined Grupo Aeroportuario del Pacífico (GAP), a consortium headquartered in Guadalajara. This consortium included Spanish investors Unión Fenosa, Dragados, and Aeropuertos Españoles y Navegación Aérea (AENA), along with Mexican strategic investor Grupo Empresarial Ángeles, managing a total of 12 airports.

Under the airport privatization concession in 2002, an expansion project was undertaken by the airport management. The extension of concourses A and B allowed for a doubling of the terminal's capacity. Furthermore, several taxiways were expanded to accommodate larger aircraft, such as the Boeing 747.

Growth and hub years
Throughout its history, Tijuana Airport has served as a strategic hub for various airlines. In the 1990s, up until its discontinuation of services in 2006, Aero California utilized the airport as a hub, offering services to over 12 domestic cities. Other airlines such as TAESA, Aerolíneas Internacionales, Líneas Aéreas Azteca, and Avolar also established their hubs in Tijuana during the 1990s and early 2000s, operating extensive domestic networks. Notably, Avolar had its maintenance base at a large hangar facility in Tijuana, later acquired by Volaris. Volaris initiated operations in Tijuana in 2006, gradually expanding its services and transforming Tijuana into a hub with connections to more than 35 destinations.

As the airport grew in significance, emerging as one of the country's largest hubs, plans for a new terminal were contemplated, though no tangible progress has been made. Between 2011 and 2012, significant renovations occurred in the passenger terminal, particularly in Concourses A and B. These enhancements included the establishment of new customs and international arrivals facilities and the construction of a new bus terminal.

Binational operations
On December 9, 2015, the Cross Border Xpress (CBX) was officially opened, establishing a physical connection between the passenger terminal in Tijuana and a new terminal in San Diego. This innovative project facilitates seamless passenger crossings between the two countries, effectively transforming Tijuana Airport into a geographically binational airport with direct access from both Mexico and the United States. The realization of this project follows decades of planning and negotiations, addressing aspects such as border control, management, funding, and construction. Notably, on December 19, 2015, the airport experienced its busiest day, recording a total of 164 flights between departures and arrivals.

The airport's proximity to the U.S. border makes it an appealing option for cross-border travelers heading to Mexican cities. However, due to its close proximity to San Diego Airport and the high transportation taxes for international flights in Mexico, the airport has not been able to retain international destinations. Passengers traveling to destinations in the United States and abroad typically choose to use San Diego International Airport, which is situated less than 30 km northwest of Tijuana Airport.

In 2022, an expansion of the passenger terminal was constructed. Named  'Nuevo Edificio Procesador' (New Processing Building), it features additional check-in counters, security lanes, boarding gates, and immigration facilities for both international flights and cross-border passengers entering from San Diego. The expansion aims to attract flight services to Asia and South America, with the goal of turning Tijuana Airport into a convenient alternative to U.S. airports for connecting passengers traveling between the two continents. Future plans for the airport include the addition of a hotel and a new bus terminal.

Routes evolution
In 1954, Mexicana de Aviación introduced direct flights from Tijuana to Mexico City. During the '70s, the cargo airline AeroCarga offered flights from Tijuana to La Paz, Mexico City, and Mérida, utilizing a fleet of Douglas DC-6 aircraft. In 1971, Aeroméxico initiated flights to Mexico City with Douglas DC-8 equipment, and by 1976, it expanded its services with McDonnell Douglas DC-10 equipment to Guadalajara and Mexico City. Mexicana reinaugurated its Tijuana flights in 1978, operating a daily flight from Mexico City with a stop in La Paz, using Boeing 727 equipment.

In 1983, Aero California launched the Tijuana-Los Mochis-Guadalajara route with McDonnell Douglas DC-9 jets. Mexicana inaugurated the Guadalajara route in 1985, operating various aircraft, including Boeing 727, Boeing 757, Airbus A318, Airbus A319, and Airbus A320, over a span of 25 years. In the summer of 1987, Aeroméxico introduced flights to Bogotá, Colombia, utilizing Douglas DC-8-62 equipment on Mondays, Tuesdays, Wednesdays, and Saturdays. However, in 1988, Aeroméxico faced a crisis, declaring bankruptcy and undergoing restructuring, which impacted its services in Tijuana. In 1991, TAESA initiated flights to Mexico City with a stop in Los Mochis, employing Boeing 727 equipment.

In 2006, Aeroméxico launched the Tijuana-Acapulco route, utilizing Boeing 737-700 aircraft. The same year, Líneas Aéreas Azteca initiated flights to Oakland. Viva Aerobus began operations in Tijuana from its Monterrey hub in 2006, operating Boeing 737-300 equipment. Interjet introduced flights to Mexico City in 2008. In 2009, Mexicana closed routes to Culiacán and Puebla, ultimately declaring bankruptcy in 2010. From 2006 until September 2014, Aeroméxico operated three weekly flights to Tokyo-Narita with a Boeing 777-200, but in September 2014, these flights were relocated to Monterrey. Additionally, Aeroméxico provided services to Shanghai from 2006 to 2009 and then again from 2010 to 2019. In 2012, regional airline Calafia Airlines initiated twice-weekly flights to Tijuana, following the route Tijuana-Loreto-La Paz. Viva Aerobus suspended its operations in Tijuana in 2014. Interjet started operations on the Acapulco-Tijuana-Acapulco route in 2015, utilizing the Sukhoi Superjet 100. On March 4, 2015, Volaris resumed the Tijuana-Oakland route, offering 2 flights per week. Initially launched in August 2009 and operating daily, the route was canceled due to poor results. On October 1, 2015, Aeroméxico Connect resumed flights from Tijuana to Monterrey, operated by the Embraer 170. Viva Aerobus also resumed its flights in Tijuana on November 19, 2015, with Mexico City as its first route, marking the beginning of its current operating base and focus city service.

From 2017 to 2018, Volaris Costa Rica initiated flights to San Salvador and Guatemala City. From 2018 to 2020, the Chinese airline Hainan Airlines commenced three weekly flights from Beijing to Tijuana and Mexico using Boeing 787-8 equipment. International service is set to resume on February 15, 2024, with American Eagle launching flights to Phoenix, Arizona.

Volaris is the largest operator in the airport, offering flights to more than 35 domestic destinations. Additionally, along with Viva Aerobus, it serves the longest domestic non-stop route in Mexico, from Tijuana to Cancún, with a flight time of over 4 hours.

Facilities
The airport features a single 3000 m long 09/27 runway, a parallel taxiway, and an apron with 23 parking positions, mostly arranged for narrow-body commercial aircraft surrounding the two terminal pier buildings. There are 12 positions with direct access to the terminal and 11 remote positions. Adjacent to this area, there is a general aviation apron offering stands for fixed-wing aircraft and heliports for private aviation, as well as hangars and maintenance facilities. The airport features a high-tech control tower, one of the tallest in Mexico.

On the opposite side of the Main Terminal building, there is another terminal, the Old Airport Terminal, and a former runway. The Old Airport Terminal houses military facilities, and south of the former runway, 4 remote positions are located, mostly used by cargo airliners. These are linked by a shorter taxiway to the main runway. The airport is also used to a lesser extent for general aviation, housed at the General Aviation Building (GAB).

Runway 09/27 runs east–west approximately 300 m south of the U.S.-Mexico border. The approach to the runway is either from the east (normally) or from the west (when Santa Ana wind conditions exist). Due to prevailing winds, the 27 runway is Tijuana's main approach pattern. The airport can handle up to 10 million passengers per year and 360 flights per day. It is capable of handling widebody aircraft such as the Boeing 787 and 747.

Passenger Terminal
The passenger terminal accommodates both arrival and departure services for domestic and international flights within a multi-story building, including two pier concourses with 20 gates. The ground floor of the main building includes check-in areas and an arrivals section featuring a baggage claim area and an arrivals hall. Here, passengers can access car rental services, taxi stands, snack bars, and souvenir shops. The first floor houses the main hall, which features a security checkpoint and an airside corridor leading to Concourses A and B. This zone is equipped with food stands, duty-free shops, and a VIP lounge. The gates are located in two piers, designated A and B, which are connected to the main terminal. It is designed so that international flights can be handled at Concourse B and domestic flights at both concourses. Additionally, gates 19 and 20 are located at the east end of the terminal, where passengers board their aircraft directly from the apron.

Concourse A serves domestic flights and features sitting areas with shops and food stands. It has nine gates: gates 1-5 are located on the top floor and are equipped with jet bridges, while gates 6-9 are located on the ground floor, where passengers board their aircraft directly from the apron. Airlines operating from this satellite include Aeromexico, Volaris, Magnicharters, and Calafia Airlines.

Concourse B serves domestic and international flights. It features the same layout as Concourse A with sitting areas, food stands, and duty-free shops. This concourse features eight gates: gates 10-14 are located on the top floor and are equipped with jet bridges, while gates 15-18 are located on the ground floor, where passengers board their aircraft directly from the apron. Airlines operating from Concourse B include Aeromexico, Viva Aerobus, Volaris, and from 2024, American Eagle.

The top floor of the terminal houses international arrivals corridors and the entrance vestibule for passengers coming from the Cross Border Xpress (CBX) terminal in San Diego. The vestibule leads to a Mexican immigration and customs facility and a check-in area for international passengers.

Cross Border Xpress CBX
The Cross Border Xpress (CBX), also known as the Cross-Border Terminal, is a 4200 m2 terminal located in southern San Diego, California, adjacent to the Mexican border, serving approximately one-third of Tijuana Airport's passengers. It uniquely positions Tijuana Airport as a geographically binational airport. The CBX comprises a terminal building physically located on U.S. soil, adjacent to the border, and a 120 m bridge across the border connecting to the Mexican immigration and customs facilities at Tijuana Airport. It facilitates direct access for U.S. passengers to Tijuana Airport and provides Mexican and international carriers with direct entry to the U.S. market.

The building serves departure and arrival facilities. Departing passengers can enter the building on the U.S. side before crossing the pedestrian bridge over the border, clearing immigration and customs, and boarding flights in the departure concourses in Tijuana. Arrival passengers in Tijuana can access the bridge from the baggage claim area at the terminal in Tijuana and walk across the border into U.S. customs and immigration facilities at the CBX terminal.

The building's design is the work of the late Mexican architect Ricardo Legorreta. Its central articulator node, dividing flows and functions, is a purple open central courtyard with an ash tree and a reflecting pool, referencing vernacular Mexican architecture. The arrivals hall features car rental facilities, bus agencies, and a snack bar.

The concept of a cross-border terminal was initially proposed in the 1960s as part of a broader plan to modernize Mexico's airports. Despite multiple developments and setbacks, construction commenced in 2013. With an initial estimated cost of US$78 million and a final completion cost of US$120 million, it officially opened on December 9, 2015. Building E, which hosts the parking facilities at Tijuana's Terminal underwent restructuring to support the new bridge's structure. The project received accolades for its design and innovation and has undergone renovations and additions, including a new restroom facility and duty-free area completed in 2020.

Other facilities
The General Aviation Building (GAB) is used for general/non-commercial aviation or private jets. The GAB is designed to receive up to 120 persons per hour and has all the services for the convenience of passengers during their private flights. It covers a surface area of 420 m2, housing government offices, administrative offices, a pilots lounge, and a passenger lounge. Two aviation schools are based at this terminal, along with one cargo airline operating there.

Brown Field Municipal Airport (SDM) in San Diego, California lies just over 1900 m north of the airport, with a similar runway length and orientation. SDM is a general aviation field not set up for scheduled passenger service. Both SDM and TIJ are designated as ports of entry for their respective countries.

'''Air Force Base Nr. 12 (Base Aérea Militar N.º 12, Tijuana, Baja California) (B.A.M. No. 12)''' is a facility of the Mexican Air Force located on the airport grounds. Currently, it does not have an assigned air squadron. It has an aviation platform of 14400 m2, one hangar, and other facilities for the accommodation of air force personnel. These facilities are located at The Old Airport Terminal.

Passenger
Viva Aerobus flight to Mérida makes a stopover in Monterrey.

Bus
The airport may be reached from Downtown Tijuana or Zona Rio by local bus. It costs $11.00 MXN (US$0.60).

Shuttle
Volaris provides a shuttle service from San Diego, California, to Tijuana Airport, allowing San Diego residents to make connections within Mexico. Passengers cannot board this shuttle at San Diego International Airport but instead take a local bus from the airport to the Amtrak Station at 1050 Kettner Blvd. on the corner of Broadway Ave, Downtown San Diego, CA 92101. There is no equivalent shuttle from Tijuana Airport back to downtown San Diego, as most people who connect between Tijuana Airport and San Diego pay to use the Cross Border Xpress and then take private vehicles or use Uber or taxi services since there is no public transportation from CBX.

Taxi
Due to a prohibition by Mexican law, public taxis from Mexican cities may drop passengers at the airport but cannot pick up passengers from the terminal. The airport, therefore, offers transportation for passengers from the terminal to any point in the city on SAAT Taxis Servicio Aeroportuario de Autotransporte Terrestre (Terrestrial Transport Airport Service), an airport government-leased taxi company. This and other authorized taxi carriers may be reached at the arrivals hall. This inflates taxi prices, forcing passengers to either pay them or walk outside the airport.

title: Tijuana International Airport