Paraset
The Paraset was a British small, tube-operated transceiver used by resistance fighters during World War II .
history
The Paraset was the first successful miniature transceiver . It was designed for the Special Operations Executive who used it to carry out espionage activities behind the German lines. The actual name of the facility was "Whaddon Mark VII". It was designed in the Royal Signals Special Communications Unit at Whaddon Hall , Buckinghamshire at the beginning of the Second World War. The name “Paraset” was used because these devices were often parachuted over enemy territory. They were mainly used in France, Belgium, Norway and the Netherlands.
technology
The device covered the range from 3.0 to 7.6 MHz . The output power of the transmitter was about 5 watts . The receiving part was a feedback audio with 2 tubes of the type 6SK7, the transmitter consisted of a quartz-controlled oscillator with a tube 6V6.
The efficiency of these devices is demonstrated by radio amateurs who build and use replicas according to original plans.