Inhaltsverzeichnis
Wireless Set No. 62 Mark III
Wireless Set. No. 62, developed by Pye, used by the Royal Signal Corps.
The British radio manufacturer Pye developed the compact transceiver as a successor to the Wireless Set 22, which appeared heavy and bulky due to its design with a separate power supply unit. The W.S. 62, which was a combined transceiver, antenna tuner and power supply unit in one cabinet, was actually only intended as a transitional solution until the introduction of the Wireless Set. No. 42, but the latter did not make it past the project stage and the Wireless Set No. 62 remained in use for years as a permanent solution.
The Wireless Set. No. 62 is a low output power transceiver with integrated antenna matching unit, which covers the shortwave range from 1.6 - 10 MHz in two bands.
Technical data
- Frequency range: 1.6 - 4 / 4 - 10 MHz
- Frequency memory: mechanical preset, optional crystal-controlled operation
- Sensitivity: 1.6 - 4 MHz: < 3 μV; 4 - 10 MHz: < 6 μV; Selectivity - 6 dB: 5 - 8 kHz
Power supply
- Batteries: Operation from 12 V vehicle battery
Dimensions
- 514 x 260 x 318 mm, weight kg
Accessories
Operation
The Wireless Set No. 62 is a compact transceiver that was used on vehicles, but was also carried by animals or soldiers on a carrying rack for mobile use. The set is a complete shortwave transceiver with an output power of approx. 1 W in CW telephony with integrated antenna matching and power supply unit.
The Wireless Set No. 62 radio station was developed by Pye, the first version Mk I was a troop test version, the Mk II versions were the standard version to which the early sets were retrofitted.
The main switch is located at the bottom left next to the connections for the morse key and headphones as well as the 12 Volt supply, from which a converter generates the plate voltage for the tubes: with ALL OFF the set is turned off, in the REC ON position only the receiver circuitry is powered and ALL ON switches the transceiver on.
In the centre, below the measuring instrument, is the operation mode switch for CW (Morse telegraphy) and R.T. (Telephony), NET is used for netting, to tune in to the other stations; to the right of this is the volume control.
The frequency is set on the characteristic metal round dial, which is similar to that of the Wireless Set No.19, the tuning knob with a fine tuning knob is located directly below. The two frequency bands 1.6 - 4 and 4 - 10 MHz are selected with the switch directly below.
The left-hand controls are used to adjust the antenna; A.E. Tuning is used to tune the antenna and A.E. Coupling is used to optimise signal coupling. The inductance of the antenna tuning is designed as a rolling coil with silver wire; when cranking, a roller makes the contact. A two-digit counter is used to record the optimum setting once it has been found for the operation frequencies. The right-hand control operates a variable capacitor for antenna coupling. The antenna adjustment must be operated correctly during reception until maximum noise is audible; if the adjustment is incorrect, the receiver becomes deaf.
A round instrument is located in the centre, which can be set for various measurements using the switch underneath: AE antenna current, AVC minimum reading indicates optimal tuning of the receiver, LT heater voltage, HT anode voltages of receiver (HTR) and transmitter (HTS), DRIVE input to the power amplifier.
Technical principle
Receiver: HF amplifier, main oscillator (shared with the transmitter), mixer stage, two intermediate frequency amplifier stages for the IF 460 kHz, detector and AVC rectifier, AF amplifier (output only sufficient for headphone operation) and BFO for CW reception.
[Transmitter]]: Main oscillator (shared with the receiver branch), transmitter mixer stage, buffer amplifier and transmitter final stage; a single-stage (two-stage only in the early sets) microphone amplifier is used to modulate the output stage.
Components
The set is equipped with tubes.
Technical documentation
Development
The British manufacturer Pye developed the Wireless Set No. 62 Mark I as a successor to the Wireless Set. No. 22 in 1943 within 6 months and it was introduced in 1944. After the development of the W.S. 42, which was originally intended as the successor set, came to a standstill, the W.S. 62 had a much longer service life than originally planned.
The set with its aluminium front panel and sheet steel housing was waterproof for a short time and, unlike the even heavier W.S.22, it could be used by a patrol of three men (one load each for the transceiver, the 22 Ah accumulator and the pedal generator).
When the Korean War began around 1950 and the demand for radios increased, production was resumed and the set, which was among other use dropped for parachutists, was also manufactured under licence by Pye's foreign branches in Australia and India.
