[Milsurplus] Throat mics.

[Michael Hanz]

The intelligibility studies by Bell Labs did a lot to improve the 
comprehension levels through hardware, and identified the higher 
frequencies as crucial to communication.  That was one reason that 
pressing the throat microphone more tightly to the larynx helped 
(marginally).  Of course, that eliminated the "hands free" advantage 
that everyone was seeking.  The real breakthrough for that aspect was 
the oxygen mask microphone, but you still needed a switch of some sort 
to turn on your channel - thus the rise of foot switches that appeared 
in later aircraft.

73,
Mike  KC4TOS

On 9/22/2017 8:35 PM, B. Smith wrote:
>   Well its hard to  understand for the average "Ground Pounder"  whats 
> its like flying an unpressurized aircraft with round engines with 
> many  open windows etc. Lots of noise and before noise canceling 
> techniques were developed. Air Crews got used to each other and the 
> commands, a lot of the "crew chatter" used  standard terminology which 
> helped. Throat mics were a band aid but they worked. A lot of stupid 
> ideas won the war.
> k4che
>
>
> On 9/22/2017 8:10 PM, Kenneth G. Gordon wrote:
>> On 22 Sep 2017 at 18:51, _arc5 at ix.netcom.com_wrote:
>>
>> > I have two throat mics that actually work. They sound bad at 20,000
>> > angstroms above the floor. They sound bad on the floor. In fact, I 
>> think
>> > they'd sound best if the whole idea of throat mics were buried 
>> under the
>> > floor.
>>
>> Just between you and me and the gatepost, I could never understand HOW
>> those things were very supposed to work. They sure didn't work on any
>> physical principle ever known by mankind. Maybe it was something from
>> outerspace. At best, all that would be transmitted would be the
>> un-modulated growling of the vocal cords.
>>
>> IMHO, the entire idea was stupid.
>>
>> Ken W7EKB
>>
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Michael Hanz - KC4TOS