[Milsurplus] CMS

[Richard]

Argh!  I stand corrected.  I still think it's asking a lot for a barely 
trained electronics-ignorant guy to operate it.

Richard, AA1P

On 5/4/20 8:43 PM, Mike Feher wrote:
>
> 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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