[ARC5] T-30 throat microphone

[Mike Hanz]

Well, I think some of the David Clark systems accept carbon mikes as 
well as other types, but again, I'm not sure.  He never said anything 
other than "modern".

On 1/12/2015 3:48 PM, Robert Eleazer wrote:
> 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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>>
>
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