[Elecraft] AD-1-K doesn't have blocking capacitor, Heil claims

[Dick Dievendorff]

Bob Heil just told me that only the ICOM Heil adapters have blocking
capacitors.

>> Of course NONE of the Kenwood or Yaesu have any blocking caps as none of
their inputs have phantom voltage (thank goodness)

Dick, K6KR

-----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 11:32 AM
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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