[Icom] Help for ICOM HM-12 Microphone
[email protected]
[email protected]
Tue, 3 Dec 2002 13:26:18 -0500
It cannot be removed, because it powers some other parts of the circuit=2E=
=20
BUT, you can move the red lead to the other side of the resistor (there is=
an unused pad on the circuit board there) and it works like gang busters=2E=
Thanks for the hint=2E
Original Message:
-----------------
From: Brad Humphries ae4vj@yahoo=2Ecom
Date: Wed, 27 Nov 2002 13:24:04 -0500
To: icom@mailman=2Eqth=2Enet
Subject: RE: [Icom] Help for ICOM HM-12 Microphone
Yes, take out that 1k in the power lead=2E=2E=2Ethat will increase the out=
put,
but I don't know how much=2E=2E=2E
-----Original Message-----
From: icom-admin@mailman=2Eqth=2Enet [mailto:icom-admin@mailman=2Eqth=2Ene=
t] On
Behalf Of millenniumfalcon@cableone=2Enet
Sent: Wednesday, November 27, 2002 12:59 PM
To: icom@mailman=2Eqth=2Enet
Subject: RE: [Icom] Help for ICOM HM-12 Microphone
Which resistor? The 1k resistor in the power lead to the mike??? The
rig
is an ICOM 725
Original Message:
-----------------
From: Brad Humphries ae4vj@yahoo=2Ecom
Date: Wed, 27 Nov 2002 12:56:08 -0500
To: icom@mailman=2Eqth=2Enet
Subject: RE: [Icom] Help for ICOM HM-12 Microphone
You can try taking the resistor out also=2E=2E=2E If its an older rig (73=
0,
40, etc=2E) they don't have a mic preamp in them=2E =20
-----Original Message-----
From: icom-admin@mailman=2Eqth=2Enet [mailto:icom-admin@mailman=2Eqth=2Ene=
t] On
Behalf Of millenniumfalcon@cableone=2Enet
Sent: Wednesday, November 27, 2002 12:41 PM
To: icom@mailman=2Eqth=2Enet
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=2E I can get full modulation only with a shrill whistle=2E Wi=
th
voice it is only about 25% modulation=2E
Original Message:
-----------------
From: Brad Humphries ae4vj@yahoo=2Ecom
Date: Tue, 26 Nov 2002 16:36:02 -0500
To: icom@mailman=2Eqth=2Enet
Subject: RE: [Icom] Help for ICOM HM-12 Microphone
You really don't need the =2E047 cap=2E Since you are using an electret=2E=
Take that out and your output will jump!
-----Original Message-----
From: icom-admin@mailman=2Eqth=2Enet [mailto:icom-admin@mailman=2Eqth=2Ene=
t] On
Behalf Of Ken Meyer
Sent: Tuesday, November 26, 2002 4:14 PM
To: icom@mailman=2Eqth=2Enet
Subject: Re: [Icom] Help for ICOM HM-12 Microphone
I have a brand new Icom HM-12 mic,=20
Still in the plastic wrap, $45=2E00 shipped
to your door via UPS ground=2E=20
73 Ken k9kjm@arrl=2Enet=20
----- Original Message -----=20
From: <millenniumfalcon@cableone=2Enet>
To: <icom@mailman=2Eqth=2Enet>
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=2E0 Volts coming through a 1K resistor it seemed to match
the
schematic for an electret mike=2E After puting it back together using the=
RS
element and a =2E047 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=2E
So I need some advice or I still need a HM-12 mobile mike for the ICOM
725
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Icom FAQ: http://www=2Eqsl=2Enet/icom/
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