[ARC5] T-30 throat mic.

[Richard Knoppow]

----- Original Message ----- 
From: "Jim Haynes" <jhhaynes at earthlink.net>
To: "DSP3" <jeepp at comcast.net>
Cc: <arc5 at mailman.qth.net>
Sent: Tuesday, January 13, 2015 10:05 AM
Subject: Re: [ARC5] T-30 throat mic.


> On Tue, 13 Jan 2015, DSP3 wrote:
>> aircraft.  I asked the price of a headset for the 
>> displayed helicopter and he told me that they were about 
>> $2500, each.  So much for your standard D/C or $1000 
>> Bose!!  Anyway, the T-30 is nothing special, mic-wise.  I 
>> have a couple
>
> Or your teenagers with their Beats headsets at $200 and 
> up.

     FWIW, I found a citation in "Acoustical Engineering" 
Harry F. Olson to a Bell Labs Record article in the edition 
for V.23, No.6, 1945 which covers a number of military 
acoustical devices including the throat mic. It may be found 
at;
http://americanradiohistory.com/Bell_Laboratories_Record_Issue_Key.htm

     Nothing much new in it but the "standard" headphone 
described is not like any I've seen. Probably a prototype. 
My understanding (without a reference) is that at least some 
of the development for the familiar ear-muff style pad and 
maybe the entire phone was done at the acoustics lab at 
Harvard University.


--
Richard Knoppow
Los Angeles
WB6KBL
dickburk at ix.netcom.com