[ARC5] Reverse engineeing the BC 456 - carbon microphones

[WA5CAB at cs.com]

Would that be the SM-30/URM-14?  Handy gadget.  I turned one of them into a 
carbon microphone tester, complete with bias battery.  The unmodified unit 
sits between an audio oscillator and the transmitter carbon mic jack.  Has a 
handy switch across the key line.  And a built-in meter.  I have a reprint 
of the 6-page manual on it available.

In a message dated 03/19/2017 19:08:02 PM Central Daylight Time, 
kn7sfz at gmail.com writes: 
> Picture?
> 
> I'd like to say I've seen one before I pass on......:-)
> 
> Tnx Wayne,
> 
> Richard kn7sfz
> 
> 
> On 3/19/2017 4:58 PM, Robert Eleazer wrote:
> 
> >> By the way, should anyone need one, I have a piece of test equipment 
>> called a "Microphone Simulator."  I have no idea what it does or why it does 
>> it..
>>  
>> Wayne
>>  WB5WSV 
>>  
> 

Robert & Susan Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480
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