[Elecraft] mic - David Clark

[John Severyn]

Hi Fred,
Aviation headsets come with a variety of mikes, some dynamic, but most 
today are electret.  "Noise Cancelling" in aviation lingo usually means 
some sort of seal over or in the ear.  "Electronic Noise Cancelling" 
means the earpieces have active noise cancelling circuitry in addition 
to the ear-seal.  (the seal can be over the ear or in the ear, like a 
hearing aid, but most David Clark models are "over the ear").  The 
microphone is also most probably of a noise cancelling design.

The David Clark line is considered to be fairly high quality and has 
been around for a long time, since 1941.  They make a wide variety of 
gear, from G-suits, high altitude pressure suits, helmets, headsets etc.

http://www.davidclarkcompany.com/aviation/fixed-wing-passive.php

Various connectors are available, from LEMO to larger phone jacks and 
some specialized models.

The above link is for their present line of fixed wing headsets.  I have 
several pairs of older H10-40 units, no longer made.  The mike is a 
electret with very good noise cancelling and made to perform in a very 
high noise environment, with passive noise reduction, over the ear 
seals.  Fidelity is not the goal.  Voice communication in a very high 
noise environment of a piston engine propellor aircraft is the goal.

Other models are made for helicopter use (different connector became 
standard in helicopters).

No connection to David Clark.  Just a satisfied customer.

73
John AF6QO

On 6/11/2017 2:44 PM, Fred Jensen wrote:
> Hmmm ... I've had it for several years and it saw some use before I got 
> it but I doubt it's old enough to be a carbon mic like the WW2 T-17.
> 
> I just assumed the "noise cancelling" part applied to the headphones.  I 
> didn't know it might apply to the mic.  There's no external noise in my 
> shack to cancel anyway.
> 
> The connector is round and the contacts stick out of the face.  I think 
> there are 6, maybe Headphones, Mic, and PTT?  There's a push-switch in 
> the cable.  It looks like the connector fits over the panel connector 
> and you twist is to lock it ... like a BNC.  I don't think the 
> headphones are stereo which is a big negative with my K3.
> 
> I was just curious.  This sounds like a project for some time when I 
> have exactly nothing else to do. [:-)  Thanks for the info
> 
> 73,
> 
> Fred ["Skip"] K6DGW
> Sparks NV DM09dn
> Washoe County
> 
> On 6/11/17 1:51 PM, Jack Spitznagel wrote:
>> Fred,
>>
>> I have a widget that adapts a Sennheiser S1 av-noise canceler to my 
>> KX3. Use it for hi noise situations and it works like charm, even 
>> Massey-Ferguson mobile.🙂
>> Try it with the David Clarks.
>> Was connector a mismatched size pair of phone jacks or a complex 
>> military looking connector?
>>
>> Jack -KD4IZ
>>
>>
> 
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