[Milsurplus] CMS

[Mike Feher]

What do you mean it was never built? There are enough of them around to prove otherwise. I always thought the output audio taps sort of acted as a quasi-volume control. 73 – Mike 

 

Mike B. Feher, N4FS

89 Arnold Blvd.

Howell NJ 07731

848-245-9115

 

From: milsurplus-bounces at mailman.qth.net <milsurplus-bounces at mailman.qth.net> On Behalf Of Richard
Sent: Monday, May 4, 2020 8:12 PM
To: milsurplus at mailman.qth.net
Subject: Re: [Milsurplus] CMS

 

More...  Keying the oscillator in the cathode the amplifier plate current will run away when key-up.  Alternatively, let the oscillator run and key the amplifier with J4, with B+ on the key, not a good idea.  Similarly, in the receiver one stage of audio amplification will give good signal strength, with two stages you really need a gain control.  My guess is it was never built.

Richard, AA1P

/4/20 7:49 PM, Hubert Miller wrote:

What continues to puzzle me is the simplicity of the design, for example, no gain control in the receiver, and

the cathode modulation point, which would only work with the 1.5 volt battery tubes installed. And the 

crudity of the schematic drawing, with the tube symbols looking like something from the 1920s. The whole

thing looks quite home – brew. That the government post – WW2 built an AC power supply for it, and whose

style is clearly much more modern, is just plain weird. If the military needed a training radio, there were much

better sets already being surplused ! 

My thinking is that it was designed for some clandestine purpose ( not a great leap of imagination ) but that

it quickly became clear that it was too ham – hobbyist, took too much ham radio type practical knowledge, for

the newly minted radio operators. Like that loop of wire with a light bulb, for tune – up, or a piece of plastic 

cloth to put over the key to keep you from getting a shock. Like Mickey Mouse labs engineering. Altho the 

mechanical construction is well done. 

No one has ever seen a handcrank generator for this set. This is another piece of evidence that ( so far ) 

persuades me the set was never actually used in WW2. 

-Hue 





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