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World of Ham Radio 1997
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ic2410_9.doc
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1997-02-01
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47 lines
IC2410.9
To anyone experiencing low audio with the ICOM 2410A/H, I
have just recently purchased one of these myself and ran into the
same exact problem. After looking the unit over and determining
the same thing regarding an external mic and after a couple of
calls to ICOM, we determined the following things need to be
looked at:
1. Is the microphone an HM-56 or an HM-56A? If it's an HM-56,
then the 4 volt zener should be replaced with a 9.1 volt
zener. If it is an HM-56A, no change in the zener is
required.
2. If the problem still persists after changing the diode, or
if you have an HM-56A, I would recommend replaSing the
microphone element with a Radio Shack (NO, I AM NOT
KIDDING!!) Part No. 270-090 as the element that came with
the ICOM does not have the frequency response
characteristics required to produce the low end sounds that
make up most of the volume. Afterαreplacing that element,
then touch up on the deviation controls R-5 and R-7 may be
required.
NOTE: The original microphone element in the ICOM mic has
the outer body connected to the positive side of the
circuit. The Radio Shack element has the outer body
connected to the negative side of the circuit. Therefore,
wire the element into the circuit accordingly.
I hope this helps out - it has done a terrific job for me.
The ICOM now sounds simply marvellous! (Say this line like Billy
Crystal!)
Thanks to Gary (KF7XV) and LynDel (AA7DG) at ICOM Tech
Support for their excellent product knowledgeand technical
expertise.
Please note that this change is not recommended or supported
by ICOM at this time.
73!
Brett N9LOU