Station Radio 128B (SR128B)

This radio covers 2 to 8 MHz and comprises a separate 5-valve receiver with continuous tuning of two switched bands and a 2-valve crystal controlled transmitter. 4 spare valves are stored in the transmitter case. I believe there were inverter and dry battery power options for this set.

I never got round to finding technical info on this set so have not used it on air.

I understand that this set was developed in the 1950s for special forces (SAS) use - it is certainly lightweight but seems a little fragile by comparison with (for example) the A16 aka UK/PRC316 of similar capability but seems to have been around until at least the late 1970s (this set has test documentation from 1976 and labels from 1977).

Update 30-June-2009

It turns out that I did have schematics for the SR128B that were actually labelled incorrectly as "No. 8 Set" now that I have obtained the excellent Radio Bygones article (No. 54 Aug/Sep 1998) by A. J. Wedgewood G0TJD, which shows a different schematic drawing but all the component references and values I have checked seem to match.

Specification

Tuning Range	2-4 and 4-8 MHz
Output	0.8 to 1W
Sensitivity	15 to 40 uV for 15dB s/n
Power	1.5V heaters 135V HT


Receiver Schematic	Transmitter Schematic

Roger G3VKM has kindly provided a photo of the SR 128B in use:

DSCN5977	DSCN5978	DSCN5979
DSCN5980	DSCN5982	DSCN5983
DSCN5984	DSCN5985	DSCN5986
DSCN5987	DSCN5988	DSCN5989
DSCN5990	DSCN5991	DSCN5992
DSCN5993	DSCN5994	DSCN5995
DSCN5996	DSCN5997	DSCN5998
DSCN5999	DSCN6000	DSCN6001
DSCN6003	DSCN6005	DSCN6006
DSCN6007	DSCN6011	DSCN6012

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