[Elecraft] Heil Proset Headphones

[KQ8M]

My type of mic didn't need the bias so I used the same adapter for my IC746
Pro with my K3. The only difference I could see was I could not use the PTT
through the adapter as the pinout was different for PTT but the mic pins
were the same.

Tim Herrick, KQ8M
North Coast Contesters
kq8m at kq8m.com

K3 Serial #5934


-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Don Wilhelm
Sent: Friday, February 24, 2012 2:32 PM
To: Tom
Cc: elecraft at mailman.qth.net
Subject: Re: [Elecraft] Heil Proset Headphones

Tom,

Since you have the Icom adapter now, I must ask - Is that a Proset-Ic?  
You can find the "Ic" designation in the end of the microphone tube that 
attaches to the earphone.
If it is an "Ic" type, it has an electret microphone element which 
requires bias.
I believe the Kenwood adapter has a blocking capacitor that will prevent 
the bias voltage from reaching the mic element.
If you are using this with a K3, just plug it into the rear panel jack, 
no need for an adapter.  If you are using it with the K2, rewire the 
Microphone Configuration Header to match your Icom adapter.

73,
Don W3FPR

On 2/24/2012 1:58 PM, Tom wrote:
> I have the headset with the adapter for my Icom 756Pro.  Which Heil
> adapter do I need to use the headset with the K3? AD-1-K?
>
> Tom
> KQ5S
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