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Mike - thanks for the reply, but I believe we may be miscommunicating.
First off, per ICOMAmerica's service desk, the A-21 uses a condenser mike. He didn't say electret and because the A-21 is old, probably isn't an electret element. And talking into the body of the handheld works fine, as does the accessory "speaker/mic" - however, please note we are talking about neither. We're discussing the problem of connecting the AvComm AC-450 to the A-21. Second, the electret mike element does require power for the FET contained therein (this may be the root of my problem; OTOH, if the 'speaker/mic' works, then power is coming from somewere!) "Not true, see above." - I'm not sure what we're disagreeing on. Condenser mics and electret condenser mics both require power.Granted, for different reasons. My source for that statement is based on the following URL, but also on other reading concerning how condenser mics operate: http://www.seed-solutions.com/gregor...Microphone.htm Would you consider the use of the word "incorrect" vice the phrase "not true". "Not true" has the implication the other person is intentionally making a misstatement. I'm sure if we were face-to-face the problem wouldn't exist. - Regards, Mike Mike Weller wrote: On Fri, 26 Sep 2003 05:00:26 -0400, Michael Horowitz wrote: Folks - I'm having difficulty getting audio from my Avcomm headset to my Icom A-21 handheld. Your Icom A-21 uses an internal electret mike. There is no reason your headset electret won't work. I use my headset with an A-3 and it works fine. Are you sure you're putting the mike about a half inch from your lips and speaking directly into it? The Icom requires a condenser microphone and the Avcomm has an 'electret' element, which as I understand is a variety of condenser mic. Not true, see above. Has anyone had a similar problem and how was it solved? - Mike PS- I see a variety of circuitry on the 'net describing how to power the microphone, but I was hoping not to have to go off building another box. Just not true. The only headset interface that I've seen that requires power is for active noise cancellation. Mike Weller |
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