[Icom] Icom 2100H Transmit Crackle/Static Fix

Tue, 9 Jul 2002 13:41:14 -0400

Thanks!  I always wondered that that noise was from mine,  I never really
got a good answer on how to fix it,  I'll try your suggestion, I get that on
high power all the time, I don't on low power so much or med, but high power
it's very noticeable, first time I thought the radio was going to blow up on
me  lol.  thanks!  I'll work on that as a rainy day project over here.
John Miller N1UMJ
Owner: J E M Racing need sponsors and crew help
to chat with me  AOL instant messenger JEMracing3
----- Original Message -----
From: "Linden, Mike (BRC-Hes)" <[email protected]>
To: <[email protected]>
Sent: Tuesday, July 09, 2002 1:29 PM
Subject: [Icom] Icom 2100H Transmit Crackle/Static Fix


>   I'm not sure if this subject has already been addressed here or not, so
> here goes. My 2100H has been generating a crackle/static noise from the
> speaker on transmit for at least a year or so (it can be really annoying).
> It seems to get worse at higher power levels. The only reference to the
> problem I found on UseNet was that it might have something to do with the
PC
> board mounting screws being loose.
>
>   I decided to pull the radio out of the car the other day while
installing
> a new mobile speaker. I found the screws on the board to be fairly snug.
> Regardless, I placed star washers under some of the screws and tightened
> them all down.
>
>   I also noticed that one of the two solder bridges that connect the
ground
> side of the SO-239 to the board looked like it was cracked. I reflowed the
> solder on both of these solder bridges (the SO-239's center conductor
> connection looked fine) and closed-up the rig.
>
>   The crackle/static problem I had on transmit is now completely gone
(even
> on high power). If you have this problem and are thinking of doing trying
> this fix, I would make the following suggestions: Use star washers that
are
> small enough that they will not short any nearby traces to ground (some of
> the PC board mounting screws have small traces nearby). The gaps between
the
> SO-239's ground "pins" and the PC board look like they might be as large
as
> an eight of an inch or so. This is a pretty big gap to be bridged by
solder!
> In retrospect, I probably should have run a small piece of stranded wire
> across the gap to make the bridge more robust -- I'm sure these solder
> bridges are seeing some stress due to thermal expansion/contraction.
>
>   I hope someone finds this helpful!
>
>   -Michael, N9BDF
>
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