[Elecraft] [KX3] MIC Bias has no effect

Don Wilhelm w3fpr at embarqmail.com
Sun Apr 20 10:13:24 EDT 2014


Dale and all,

You will find that all computer microphones will behave the same way 
with the KX3.  That is because those microphones connect the tip and 
ring together.
The K3 does not connect anything to the ring connection in the rear 
jack, so it is not noticed.
Use the instructions provided by Lyle Johnson KK7P to use the mic 
directly on the KX3.  If that is not satisfactory, build an adapter that 
does not connect the ring of the mic plug to the ring of the KX3 mic 
jack.  If you build such an adapter, you will have to turn mic bias on.

73,
Don W3FPR

On 4/19/2014 12:27 PM, dmb at lightstream.net wrote:
> I'm connecting a Yamaha CM500 headset to the KX3, and find that the
> microphone works properly regardless of the MIC BIAS setting (MIC BTN is
> set to OFF).
>
> As I recall, the few times I used the CM500 w/ the K3, the MIC BIAS had to
> be ON or the microphone produced no output.
>
> Any idea why the MIC BIAS setting doesn't seem to matter w/ the KX3?
>
> 73, Dale
> WA8SRA
>
>
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