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

Zip File of this directory [ BACK ]

Last Updated Tue Jun 23 10:38:36 BST 2009