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Short Wave Transmitter-Receiver GR250

Short Wave Transmitter-Receiver GR250; Redifon Ltd.; London (ID = 1766454) Commercial TRX
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Short Wave Transmitter-Receiver GR250; Redifon Ltd.; London (ID = 1766454) Commercial TRX
Redifon Ltd.; London: Short Wave Transmitter-Receiver GR250 [Commercial TRX] ID = 1766454 532x366
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For model Short Wave Transmitter-Receiver GR250, Redifon Ltd.; London:
From Wireless World, Vol. 62, January 1956, p. 40.
Country:  Great Britain (UK)
Manufacturer / Brand:  Redifon Ltd.; London
Year: 1956 ? Category: Commercial Transmitter & Receiver (TRX not Amateur)
Main principle Transceiver
Wave bands Short Wave (SW only)
Power type and voltage Line / Batteries (any type) / 230 / 12 Volt
Loudspeaker Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil)
Power out
from Model: Short Wave Transmitter-Receiver GR250 - Redifon Ltd.; London
Material Metal case
Shape Tablemodel, low profile (big size).
Dimensions (WHD) 31.25 x 18.25 x 14 inch / 794 x 464 x 356 mm

Transmitter: Operation on c.w. or m.c.w. telegraphy and on radio-telephony. Can be operated either as a continuously tunable set over the range 2 to 12.5 MHz in three ranges, or by crystal control on five spot frequencies with self-contained crystals.                                                                                                                                                                 

Power output is 25 - 50 W into a 70 Ω line. Normally reliable range is 200 - 300 miles on telegraphy, and about half this on telephony.                                                                                 

Receiver: An r.f.-mixer-2 i.f. superhet with b.f.o., noise limiter (2 crystal diodes), audio and outout stages. Continuous coverage of 2 to 25 MHz in three ranges.                                                                                                                                                      

Net weight (2.2 lb = 1 kg) 135 lb (135 lb 0 oz) / 61.290 kg
Mentioned in Wireless World (The), London (WW, 79) (Vol 62, January 1956, p. 40.)

Model page created by Karl Dilcher. See "Data change" for further contributors.

All listed radios etc. from Redifon Ltd.; London
Here you find 8 models, 7 with images and 1 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.