Short Wave Transmitter-Receiver GR250
Redifon Ltd.; London
- Country
- Great Britain (UK)
- Manufacturer / Brand
- Redifon Ltd.; London
- Year
- 1956 ?
- Category
- Commercial Transmitter & Receiver (TRX not Amateur)
- Radiomuseum.org ID
- 262905
- 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)
- Material
- Metal case
- from Radiomuseum.org
- Model: Short Wave Transmitter-Receiver GR250 - Redifon Ltd.; London
- Shape
- Tablemodel, low profile (big size).
- Dimensions (WHD)
- 31.25 x 18.25 x 14 inch / 794 x 464 x 356 mm
- Notes
-
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.)
- Author
- Model page created by Karl Dilcher. See "Data change" for further contributors.
- Other Models
-
Here you find 11 models, 9 with images and 2 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
All listed radios etc. from Redifon Ltd.; London