Fw: homebrew KX3 electret microphone

[Leroy]

From: lmarion
Sent: Saturday, October 25, 2014 6:52 PM
To:
Subject: homebrew KX3 electret microphone

I am  trying to make a KX3 microphone, no up/down. Just PTT with MIC bias.  
1)  do I need 4 ring jack, or will a 3 ring work?
2)  which jack ring is used for the MIC bias?

            Thanks, Leroy  AB7CE
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[David Shoaf]

You don't need a TRRS plug.  You can use a TRS plug.  Mic hot lead to the Tip.  PTT to the Ring.   Ground on the Sleeve.

Then, in the Menu, set MIC BTN = PTT.  This turns the Mic Button feature off.

Mic bias is applied to the mic lead on the tip - no separate connection.  See the schematic on the Elecraft website.

Cheers,

David/KG6IRW