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Found another interesting item at the HRSA auction, bought it for $5.00 for the microphone.
This one had been screwed up and would only operate on low power. Looks like someone has tried to reprogram it to get more channels and had made a mess of it. The CE52E software has allowed me to change that and to correct where the CB channels had been messed up.
Contact me via email at: email@example.com
You can see how the cam generates SOS three times per revolution. I do not know how it actually workes. It looks to me as though the spring was pre would and turning the handle one revolution started the transmission by setting the cam rotating for one revolution. The tubes are a VR66 as the oscillator and two 807 in parallel in the output.
There are two sets of tubes, one set in use and the other as spares. The power supply has a 12 Volt vibrator "in use" and a spare.
Here is a higher resolution circuit diagram
Does anyone out there know anything about this item ?. I have searched the web and cannot find any information on it.
These two items turned up in a small 19 inch rack with a TCA R5223 communications receiver. I was only interested in the R2553, I helped assemble them as an apprentice at Philips (TCA) almost a life time ago. Looking at the coils it must have been a low band two way radio base station. The crystal in the Transmitter is 8.85 MHz and in the Receiver, 11.2 MHz
I am looking for more definitive information on these.
I asked Ian Wall, founder of Codan, about this item and here is his answer:
Gosh! You are seeking information about a product originally designed in 1972 and up-dated to a Mk2 version and up-dated again to Mk2B so you will understand it is very hard to find anything at all. So far I have found the schematic A3 04-00794 - not the original but a TIFF file created when (I believe) the original paper drawings were abandoned.
It was intended for use with our 100W PEP Transceivers installed on boats/ships and could match the 50 Ohm impedance of the radio to a variety of antennas having different impedances at their feed points. The Load switch SW1 dealt with the resistive component of the antenna by selecting the appropriate winding on T1 whilst the reactive component was handled by the variable inductor L1 and additional inductor L2 or, alternatively, by capacitors selected by Sw2. Resistors R2...R5 are bleeders preventing static build up on the antenna when the series capacitors were selected. The meter measured the antenna current and the knobs were twisted to achieve a maximum reading.
Ian also sent me the circuit diagram. If anyone else can add anymore info, please do.
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Written by and Copyright, Phil. Storr © Last updated 27th May 2016