[ARC5] T-30 throat microphone

[Robert Eleazer]

Okay, so no new electronics were involved.  That surprises me.

Wayne
----- Original Message ----- 
From: "Mike Hanz" <aaf-radio-1 at aafradio.org>
To: "Robert Eleazer" <releazer at earthlink.net>; <arc5 at mailman.qth.net>
Sent: Monday, January 12, 2015 1:12 PM
Subject: Re: [ARC5] T-30 throat microphone


> On 1/11/2015 7:38 PM, Robert Eleazer wrote:
>> Back in the mid-70's I got a T-30, plugged it into the stock PTT switch 
>> that matched it and gave it to a friend to try out in his airplane.  He 
>> got signal reports back that his voice was garbled.  Aside from that, he 
>> said he just knew that if the airplane crashed he would be trapped by 
>> that strap around his neck.
>
> In addition to the warning from the Bell Labs document, the "Graphic 
> Survey Of Radio And Radar Equipment Used By The Army Air Forces (Vol 2.)" 
> has this on the T-30:  "The intelligibility of its output varies widely 
> according to the shape of the throat, voice, and accent of the individual 
> speaker."  I can't imagine the USAAF running around testing every flyer 
> for those characteristics...  :-)
> Besides the shift to oxygen mask mics, it's no wonder they became disused 
> toward the end of the war.
>
>> What kind of adapter was employed for the tests?
>
> Not sure, but I think it was simply an adapter cable from a male PL-291 to 
> whatever the interphone system used.  They had a modern set of aircraft 
> radios in the plane.
>
> 73,
> Mike
>
>
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