Six radiomen told how, twice on two days after the ring was nabbed, a transmitter near Moscow was heard calling, using signals, times and wavelengths specified on codes found hidden in cigaret lighters in Lonsdale's apartment and the Krogers' house and also fastened to the transmitter lid.

Audio processing was necessary for early radio broadcasting, as there were many problems with studio to transmitter links.

One clear benefit of the ' late arrival ' of the channel was that its frequency allocations at each transmitter had already been arranged in the early 1960s, when the launch of an ITV2 was highly anticipated.

While the Browns ' on-field play in 1956 was uninspiring, off-the-field drama developed after a Cleveland-based inventor named George Sarles let Brown test a helmet with a radio transmitter inside.

Suspended during World War II, the BBC service was re-established in June 1946, and had only one transmitter, at Alexandra Palace, which served the London area.

By law, these cable systems were restricted to the relay of the public broadcast channels, which meant that as the transmitter network became more comprehensive, the incentive to subscribe to cable was reduced and they began to lose customers.

Duddell didn't further develop his invention, but in 1902 Danish physicists Valdemar Poulsen and P. O. Pederson were able to increase the frequency produced into the radio range, inventing the Poulsen arc radio transmitter, the first continuous wave radio transmitter, which was used through the 1920s.

The device was developed for use as part of the Germans ' Kehl radio control transmitter system used in certain German bomber aircraft, used to guide both the rocket-boosted anti-ship missile Henschel Hs 293, and the unpowered pioneering precision-guided munition Fritz-X, against maritime and other targets.

Here, the joystick of the Kehl transmitter was used by an operator to steer the missile towards its target.

The electrical power for the instruments and the radio transmitter of Mariner 4 was supplied by 28, 224 solar cells contained in the four 176 x 90 cm solar panels, which could provide 310 watts at the distance of Mars.

The difficulties led to many historical controversies over whether a given chemical was or was not clearly established as a transmitter.

At 8. 00 p. m. on 8 October 1923, Germany's first radio broadcast was made, using the world's first medium-wave transmitter, from a building ( Vox-Haus ) close by in Potsdamer Straße.

Despite several upgrades between December 1923 and July 1924, the nearby Hotel Esplanade's formidable bulk prevented the transmitter from functioning effectively and so in December 1924 it was superseded by a better sited new one, but Vox-Haus lived on as the home of Germany's first radio station, Radiostunde Berlin, founded in 1923, renamed Funkstunde in March 1924, but it moved to a new home in 1931 and closed in 1934.

This was accomplished by adding a frequency shift keyer that used a diode to switch a capacitor in and out of the circuit, shifting the transmitter ’ s frequency in synchronism with the teleprinter signal changing from mark to space to mark.

A very stable transmitter was required for RTTY.

The typical frequency multiplication type transmitter that was popular in the 1950s and 1960s would be relatively stable on 80 meters but become progressively less stable on 40 meters, 20 meters and 15 meters.

The term was coined by Canadian Engineer Reginald Fessenden describing his proposed method of producing an audible signal from the Morse Code transmissions of an Alexanderson alternator-type transmitter.

Edison was granted patent 222, 390 for a carbon granules transmitter in 1879.

Most, however, used the Edison / Berliner carbon transmitter, which was much louder than the other kinds, even though it required an induction coil which was an impedance matching transformer to make it compatible with the impedance of the line.

So an old on / off 6-channel transmitter which could drive the rudder, elevator and throttle of an aircraft was replaced with a new proportional 3-channel transmitter doing the same job.

During World War I, the original Marconi spark transmitter was replaced with an Alexanderson alternator, the invention of the famous General Electric engineer, with an output power of 200 kilowatts and looking like an ordinary power station generator.

Between 2002 and 2003, the existing radio antenna, built primarily for Clear Channel Communications as a backup transmitter site for its four FM stations, was removed and replaced with a 300-foot ( 91 m ) mast to support television and radio broadcasters as a backup transmission site.

In March 2008, WREK replaced its then 20-year-old transmitter with a brand new unit capable of three times the signal power and providing HD Radio capability.

The new transmitter replaced one that failed in 1998.

This analog transmitter was replaced with two UHF transmitters serving Vancouver and Victoria, both with lower coverage areas, but with improved coverage to those particular metropolitan areas.

However, it originally broadcast from a series of smaller studios ( which were torn down and replaced by a building that now houses the National Ballet School ) on Jarvis Street next to its old transmitter.

It was eventually replaced with a transmitter at the nearby Langley Mill MF site owned by Arqiva.

A 1 kW transmitter was installed on Mount Panorama in 1977, and replaced in 1994.

As the more efficient transmission mode of continuous waves ( CW ) became easier to produce and band crowding and interference worsened, spark-gap transmitters and damped waves were legislated off the new shorter wavelengths by international treaty, and replaced by Poulsen arc converters and high frequency alternators which developed a sharply defined transmitter frequency.

The tower was modeled on the Mühlacker radio transmitter, it replaced a smaller transmitter in Gleiwitz situated nearby on Raudener Straße and went in service on 23 December 1935.

Analogue transmissions continued on mediumwave with a restricted time schedule until 27 June 2011, when the mediumwave transmitter was taken out of service and replaced by a new longwave transmitter.

The old analogue long-and mediumwave reserve transmitter is known to have replaced the mediumwave and DRM transmitters on longwave from 16-31 October 2009, and the antenna tower for mediumwave is still standing.

From 1932 to 1934 this transmitter ( which replaced the Stadelheim Transmitter at Munich-Stadelheim ) used a T-antenna as transmitting antenna, which was spun between two 115-meter-high free-standing wooden lattice towers, which were 240 metres apart.

The GBR transmitter was shut down on 1 April 2003 and was replaced by a new one at the Skelton transmitting station.

First the old transmitter was replaced by a new, fully transistorized transmitter, which would be also able to operate in DRM mode.

In 1968 the tower was upgraded to serve the new 300 kW transmitter ( amongst others, the ceramic base insulator had to be replaced to withstand the higher voltages ).

In 1977 the new 2MW transmitter at Solt has replaced the Lakihegy tower as the primary national transmitter.

By 1931, Westinghouse had concluded that Boston was WBZ's primary market, and on February 21 the station moved to a new transmitter site in Millis, a location chosen to also provide service to Worcester and Providence, Rhode Island.

In 1931 a longwave broadcasting transmitter was set up in Raszyn.

The place was actually used for transmitting purposes from 1931 when the then Polish Radio Co. opened their new, modern 120 kW transmitter that was using two 280 m tall guyed steel lattice masts to support a T-shaped antenna.

CBS bought the station from the previous owner in 1931, officially moved the station to Washington, D. C., although the transmitter site remained in Virginia.