[Milsurplus] throat mike technique

[WA5CAB@cs.com]

Mike,

Good pix.  I'm sure that you're correct about the T-45 being a ground use 
mic.  I should have been more specific.  The ear-loops that attach to T-45 to 
the user aren't too comfortable.  The Navy variant, CW-51071, is better in 
this regard.  It is the same as the T-45 except that in place of the 
ear-loops it has two female snaps that attach to male snaps on the sides of 
the 49507 headset.

The M-51/UR element was also used in the M-52/U carbon hand-mic that replaced 
the T-17.  I have some M-52A/U NOSB.  They have a straight cord that can also 
be used to replace the cord in a T-17.

Is there any technique that is effective in unpacking the granules?


In a message dated 3/25/2003 5:25:46 AM Central Standard Time, 
AAF-Radio-1@cox.net writes: 
As far as I can determine from the docs here, the T-45 wasn't used in 
WWII aircraft.  Watching Norm Chipps demonstrate one in his excellent 
talk at last fall's MRCA meet, I'm just as glad...that contraption 
hanging below my nose would drive me nuts.  :-)  On the other hand, the 
reported voice quality doesn't surprise me, since the AAF did use the 
T-45 noise canceling mike element (M-6A/UR) in the H-46/UR boom mike 
headset I mentioned in a previous post.  Unfortunately, the M-6 often 
suffers from "granule packing" after long periods of exposure to 
moisture.  The good news is that the later M-51/UR mike element used in 
more common 50's/60's H-63/UR boom mike headsets is a plug and play 
replacement, and is indistinguishable from the old M-6A externally.  It 
also has better voice quality and less tendency to solidify.  I see an 
occasional H-63 at hamfests - not much desired because of the 
uncomfortable hard plastic earmuffs - but the mike element is excellent. 
  I left the picture up at http://members.cox.net/mymhh/H-46_vs_H-63.JPG 
if you missed it.

Robert Downs
Houston
<wa5cab@cs.com>


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