[Milsurplus] TM wanted to buy

[Mike Hanz]

The presence of an SW-141 does suggest a dynamic throat or possibly an 
oxygen mask mic, but it may also simply be an assemblage by a ham who 
wished to use a normal desktop dynamic mic with, for example, a command 
set.  I sent a readable schematic separately, since this archaic 
reflector can't pass it on like Glowbugs or some of the other lists I'm on.

I don't recall it being mentioned in any of the U.S. manuals, but if it 
was, it would probably be in manuals for jointly deployed equipment like 
the SCR-522.  I think the first contract (for the Model K) was in 1944, 
so earlier manuals would obviously not mention it.

73,
Mike

On 7/10/2012 7:38 PM, Jay Coward wrote:
> Hi Mike,
>   The one I have looks to be never used as there are no mounting holes drilled. It is pre-wired with a PTT (SW-141-K), mic plug PL-68, a single wire and a shielded pair with lugs. The schematic glued inside the housing is hard to read as it is viewed at an angle and even with a magnifying glass is hard to decipher .Since it has a hard wired PTT already, would this pre-amp be used with the infamous throat mics? If there was only an instruction sheet, there must have been references in other TM's to use this pre-amp if... blah-blah...Do you know if it's called out in any "addtionall required equipment" ? I've also heard it was used with dynamic mics but I am not aware of mil dynamic mics for WWII radios.
>   It's a neat little box and would be a cool add on.
>   Thanks,
>               Jay KE6PPF
>
>
>
> -----Original Message-----
> From: Mike Hanz <aaf-radio-1 at aafradio.org>
> To: Jay Coward <jcoward5452 at aol.com>
> Cc: milsurplus <milsurplus at mailman.qth.net>
> Sent: Tue, Jul 10, 2012 1:38 pm
> Subject: Re: [Milsurplus] TM wanted to buy
>
>
> There was an instruction sheet included with the preamp, Jay, but I
> can't find mine at the moment.  There wasn't much to it, as I recall.
> you need to keep the relay *energized* by grounding pin 4 when you are
> in receive mode.  You *un-ground* pin 4 when you want to transmit, so
> whatever combination of transmitter/interphone/microphone switch
> contacts you need to use to accomplish that is about the only tricky
> part to it.  The rest is straightforward...+28volts B+, ground, input
> and output.
> 73,
> Mike  KC4TOS
> On 7/10/2012 3:36 PM, Jay Coward wrote:
>>    Looking for TM for Packard-Bell Co. Pre-Amplifier Model K-1.
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