This thread has drifted into a discussion of headsets, so I'll throw in
my 2 cents worth and QRT. I realize they're pricey, but I use and love
the Radiosport headsets. I have both a RS-60CF headset with the electret
mic element and a RS-20 receive-only headset. When properly adjusted
both are extremely comfortable -- they're the only phones I've ever used
that I can wear for a full contest weekend over my glasses with no
problem whatsoever. They're NOT hi-fi phones; my understanding is that
they were originally designed for auto racing pit communications, and
the transducers are tailored for voice communication. They also have
superb isolation from outside noise, somewhere around 28 dB. I can't
hear the phone on my radio desk ring when I have them on. I also have a
Yamaha CM-500 set, and the Radiosports blow them away, as well they
should at almost 5X the price. For me, the substantial price difference
is worth every cent. YMMV.
73...
Randy, W8FN
On 6/11/2017 8:32 PM, John Severyn wrote:
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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