[ARC5] T-17 Microphone

[D. Platt]

Mark,
I'll second what Dave said.  The element might well be usable but time 
will tell after all else is done.  The capacitor is supposed to bypass 
higher frequency noise as from dynamotors and inverters such in an 
aircraft and ground installations.  I believe its a .005ufd, but that 
seems small, given the low Z of the mic.  I'll have to check...?   I 
often use 3-conductor power cords, those with no drain wire and that are 
flexible.  Many older HP cords are rubber and not the stiffer plastic 
and look original.  If the mic element is shot, one from either an 
H-33/PT handset or an old telephone/PBX headset will do very well.  
Those PBX elements are small but also difficult to find.  I agree with 
the transformer comment... What transformer???  Should not be one 
there.....  The lugs and clamp from the PL-68 can be removed, cleaned 
up, and re-used.  Using a T-1 element, and such, from telephones makes 
the mic, as I've said before, looks like a pig wearing a gas mask.  Be 
sure and burnish the contacts on the SW-106, too.

Jeep - K3HVG

On 6/11/2014 9:43 AM, David Stinson wrote:
>
> ----- Original Message ----- From: "Mark K3MSB" <mark.k3msb at gmail.com>
> Subject: [ARC5] T-17 Microphone
>
>
>> First, can the carbon mic element be salvaged? 
> Not really.  I like "originallity," but draw the line at microphones.
> If the radio is going to be alive, a "stock" T-17 isn't going to 
> work.  Not unless you're made of money
> and can by dozens to find one that will give you about 50% mod.
> A microphone element from an old land-line telephone
> will work.  Unfortunately, it won't fit inside a T-17 case
> unless you're willing to mill-out the mounting space.
> It's not a perfect world.  I won't tell if you don't.
>
> "Matching transformer??"  Shouldn't be one inside
> a T-17.  The cap is to help kill the audio "highs" you don't need.  
> Don't remember the value but
> I'll bet someone here does.
>
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