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[TenTec] Electret Microphone "plopping/clicking"

To: Discussion of Ten-Tec Equipment <tentec@contesting.com>, orion565@yahoogroups.com
Subject: [TenTec] Electret Microphone "plopping/clicking"
From: "Peter Frenning [OZ1PIF]" <peter@frenning.dk>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Sun, 13 Sep 2009 12:02:49 +0200
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
I have recently adapted various electret head sets and microphones to my 
Orion 2, running 2.041XT, and have received report on a "Plopping" or 
"Clicking" sound emanating when PTT is activated, it's fairly regular 
making the sound 3-5 times per second. It's clearly audible on Monitor, 
and also when monitoring the signal on another receiver.
I bias the electret element from the voltage present on Pin2 through a 
2.2KOhm resistor, and it does the "plopping" regardless of whether I put 
in a blocking capacitor or not.
It does NOT occur when using my 708 Dynamic desk microphone.

Does anyone have an idea what can be causing this (HW/SW), and of a cure?

Vy 73 de OZ1PIF/5Q2M, Peter

** CW: Who? Me? You must be joking!! **
email: peter(no-spam-filler)@frenning.dk
Ph. +45 4619 3239
Peter Frenning
Ternevej 23
DK-4130 Viby Sj.

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