Hello Barry,
If you connected the SM20's Pin 2 (+8V DC Input) to K3 front panel Mic Pin 6
(8V Output) then the SM20 internal preamp will provide mic bias to the SM20
electret element. That's how I wired my SM20 and it works great on the K3.
No additional Mic Bias is required.
73,
Frank - W6NEK
----- Original Message -----
From: "Barry Simpson" <[EMAIL PROTECTED]>
To: "'Elecraft'" <elecraft@mailman.qth.net>
Sent: Tuesday, August 12, 2008 2:49 AM
Subject: [Elecraft] K3 and SM20
In readiness to use my new K3 I have rewired my Icom SM20 mic to the K3
configuration. I was surprised to find that it works exactly the same with
the bias on or off. To ensure that K3 FP mic bias is performing correctly
I
have also tried out my new Elecraft Heil Proset. That works fine with the
bias on but not at all with the bias off which is what I would expect.
I thought the SM20 required bias as it is an electret mic but that does
not
appear to be the case.
Has anyone got any experience of the SM20 with the K3 ?
Barry Simpson VK2BJ
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