[ARC5] Re-working T-17 mics (was: M-15 type microphone)

[hwhall at compuserve.com]

I considered this but disliked grinding away at the vintage T-17 mike. With some help, I found an N-1 type carbon element that is smaller than the T-1 and worked well. Instead of having to cut metal from the mike I only had to make a wooden ring shaped spacer to hold the 1.75 inch dia element in the space where the old 2.25 inch element sat. Completely reversable.
 

 Wayne
WB4OGM

 

-----Original Message-----
From: Mike Everette via ARC5 <arc5 at mailman.qth.net>
To: arc5 <arc5 at mailman.qth.net>; DSP3 <jeepp at comcast.net>
Sent: Wed, Nov 5, 2014 3:47 pm
Subject: [ARC5] Re-working T-17 mics (was:  M-15 type microphone)


The Navy RS-38 is somewhat better than the T-17 for sensitivity and sound 
quality; but the PTT button has a strong spring and will kill your grip.  The 
T-17 is far more comfortable to use.

Best thing to do with a T-17 is to throw away the old element and sub a T-1 (or 
later T-3) telephone mic cartridge into it.  You will have to "mill out" the 
case just a little.  On the metal T-17, this can be done using a Dremel tool 
with a grinding tip.  Center the cartridge over the opening and carefully draw 
and/or scribe an outline/guide line before beginning work.  GO SLOW.  Be sure to 
work evenly all the way around the case.  You're looking for a tight press-fit, 
ideally.

Enlarge the holes in the face, and maybe add a few more -- use a drill press and 
get a pretty job.  You'll be impressed with the results.

I've not done this milling operation on a plastic T-17, but it should be fairly 
easy and go a bit faster than with a metal one (I've actually done several metal 
versions).

73

Mike
WA4DLF



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