[Icom] Help for ICOM HM-12 Microphone

Wed, 27 Nov 2002 11:22:29 -0800

I would check your LSB and USB carrier oscillators to make sure that they
are set correctly.  This could account for no lows in the audio.  73's from
Fern

-----Original Message-----
From: [email protected] <[email protected]>
To: [email protected] <[email protected]>
Date: Wednesday, November 27, 2002 9:42 AM
Subject: RE: [Icom] Help for ICOM HM-12 Microphone

>I took it out and the output doubled, but it is still too weak at the lower
>frequencys.  I can get full modulation only with a shrill whistle.  With
>voice it is only about 25% modulation.
>
>Original Message:
>-----------------
>From: Brad Humphries [email protected]
>Date: Tue, 26 Nov 2002 16:36:02 -0500
>To: [email protected]
>Subject: RE: [Icom] Help for ICOM HM-12 Microphone
>
>
>You really don't need the .047 cap. Since you are using an electret.
>Take that out and your output will jump!
>
>-----Original Message-----
>From: [email protected] [mailto:[email protected]] On
>Behalf Of Ken Meyer
>Sent: Tuesday, November 26, 2002 4:14 PM
>To: [email protected]
>Subject: Re: [Icom] Help for ICOM HM-12 Microphone
>
>I have a brand new Icom HM-12 mic,
>Still in the plastic wrap, $45.00 shipped
>to your door via UPS ground.
>73   Ken     [email protected]
>
>----- Original Message -----
>From: <[email protected]>
>To: <[email protected]>
>Sent: Tuesday, November 26, 2002 2:04 PM
>Subject: [Icom] Help for ICOM HM-12 Microphone
>
>
>I pulled the microphone apart and discovered what appears to be an
>electret
>element so I tried putting in an electret from Radio Shack when I found
>the
>red wire had 8.0 Volts coming through a 1K resistor it seemed to match
>the
>schematic for an electret mike.  After puting it back together using the
>RS
>element and a .047 cap in series to the audio line I had modulation once
>again, so I think I am on the right track, but it is very low output.
>
>So I need some advice or I still need a HM-12 mobile mike for the ICOM
>725
>
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>Icom Users Net: Sundays, 1700Z, 14.315 MHz
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>