[Elecraft] K3 Rear Panel Microphone Jack Bias Voltage

[Steve Ellington]

Paul
If you unplug that mic from the rear panel jack, can you measure any bias 
v.? I use a computer mic on the RP with bias set for rP.H BIAS.
Steve Ellington
N4LQ at carolina.rr.com
----- Original Message ----- 
From: "paul alexander" <wb9ipa at gmail.com>
To: <elecraft at mailman.qth.net>
Sent: Sunday, April 26, 2009 8:54 PM
Subject: [Elecraft] K3 Rear Panel Microphone Jack Bias Voltage


>I recently assembled my K3 and am having some trouble getting a
> microphone to operate.  All of my station microphones are  Motorola
> handheld microphones.  These are dynamic microphones which have a
> built-in amplifier, to make them appear as carbon microphones.  As
> such, they require bias voltage.
>
> My first attempt was to connect the microphone via the rear panel
> jack, using the following menu settings:
>    Mic SEL
>         rPL.bIAS
> and
>    MIc + LIn
>         On
>
> Under these settings, I get no bias voltage on the rear panel microphone 
> jack.
>
> When I set Mic SEL for FPL.bIAS, I get bias voltage on the front
> panel, and a microphone connected to the front panel connection works
> as expected.
>
> FYI, the radio Serial Number is 2925 and the firmware is version 1.98,
> MAR 31, 2009.
>
> Is it not possible to get microphone bias voltage on the rear panel
> connector?  Do I have something set up incorrectly?
>
> Any suggestions would be appreciated.
>
> Thank-you
>
> Paul Alexander
> wb9ipa
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