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Old 29th Oct 2020, 10:04 pm   #14
trh01uk
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Join Date: Nov 2010
Location: Ross-on-Wye, Herefordshire, UK.
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Default Re: History of the Reception Set R. 209 MkI

Quote:
Originally Posted by Keith View Post
It seems incongruous to me that the massive WS53 with it's 2x813 modulated by 2x813 would have been paired up with a receiver using battery valves! I wouldn't have thought that just shorting the aerial would have been enough to save the operators ears...
Just had a further dig into the Trade Training Notes for the WS53. If you look at Fig.20 (after page 25) it shows a "relay D" inside the Remote Control Unit 'H', and one contact is used to short out the headphones when the "SEND" switch on the remote control is activated. At least that's what the text on page 26 says - not what the diagram shows (Trade training notes are rarely accurate).

A recourse to the schematic of the H1 remote control, shows relay contact D2 actually disconnects the receive audio from the headphones which are plugged into that remote control.

So that's probably the answer here - that a remote control unit would be used typically - even if its only the other side of the lorry from the WS53. Again to be absolutely precise, the Remote Control Unit 'H' seems to have been replaced by an anonymous "Control Unit" shown in the vehicle diagram in Wireless for the Warrior, page WS53-36. What that control unit does precisely is not spelt out, but certainly the R209 audio output is fed into it.

So we might conclude some concern was taken about the operator's ears, but its lost in a myriad of detail about how the sets were worked into larger systems.


Richard
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