[Icom] mic's

[Bruce Marton]

Neil,
That's a great idea!
I have a pair of ASA headphones.  Not as nice as the Clarks, but still very
good and a close second to the ANR Clarks I tested in the plane.  I'll try
mine out on the Icom too.
I also have a Shure SM7 and Symetrix 528E combo which is connected to a
Collins S line and sounds wonderful to all those who listen.  But I want to
move this gear over to my newly acquired Icom 781 and test it out.  I am
sure it will sound even better than my trusty old ElectroVoice 607 or 638
dynamics.
73, Bruce K1XR

----- Original Message -----
From: "Neil Schwanitz" <nschwanitz@home.com>
To: <icom@mailman.qth.net>
Sent: Tuesday, February 12, 2002 1:58 PM
Subject: Re: [Icom] mic's


> I agree that the Icom hand mic's are anemic. I rolled my own and used a
> David Clark H10 - 13.4 aviation headset/mic... being a pilot and having
> several of theses in my possession, I figured that I would give it a go.
> The mic I am using is 150 ohms and the Icom is 600. 150 ohms and 600 ohm
> in the audio world are both Low Z and do not require any sort of
> impedance matching. Doing so is making more work for yourself and
> potentially upsetting the apple cart.
> If I switch back to the Icom hand mic on the rigs... the locals can tell
> and bark about it. VOX performance is excellent too!
>
> The performance of the M-7A noise canceling mic element is wonderful. I
> made an interface which has the up/down switches on it and a PTT switch
> that is (on) off on. This gives me latched in the on position, and
> momentary in the (on) position. I also wired up a foot switch for this.
> I recycled a coil cord from an old Motorola mic and added the 8 pin
> connector to the end and then came out of that with a pigtail to connect
> to the HP jack and ran that to one conductor on the coil cord to get RX
> audio to the headsets. I also made an 8 pin to RJ45 pigtail.  Now I can
> use this setup with the IC-820H and the IC-706.
>
> I have never used any of the Heil gear... but he does use Hi-Z (2,000
> ohm) elements and transformers them down to Low-Z.
>
> Aviation headset have two different phone plugs on them, a 1/4" for the
> cans and a 3/16". The 3/16" jack is $$$ and hard to find so I opt'ed to
> use a Nexus jack (used in helicopters) and used my adapter. (I also have
> helicopter David Clark's) This lets me use any of the headsets I have.
>
> These are wonderful for my needs, but at 13.4 ounces some would say that
> they are heavy. Well, they are... but I wear them all the time when I
> fly, so it feels natural to me (except the views from my shack are
> nowhere near as nice!) They are wonderful for nets and terrific for weak
> signal CW. The isolation from the natural world is -23dB. The only
> drawback to these is the XYL has "appeared out of nowhere" and scared
> the living hell out of me a few times because I never heard her coming.
> HI HI.
> It is also true that you could buy 3 or 4 of Heil's headsets for the
> cost of a single pair of these... but, being a ham, I used what I had
> around me and enjoy the results.
>
> --
> Neil Schwanitz
> Broadcast Engineer
> AAR5OZ /T
> WD8CRT
>
>
>
>
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