kleh(at)dialupatcost.ca
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 Posted: Sun Sep 07, 2014 9:45 am Post subject: Continuous open squelch Icom RFI Gemini |
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Just some comments for the archives since I could not find any specific
info on this problem. Perhaps it will help someone in the future.
When my Icom A200 VHF was replaced with a new A210, I was plagued much
of the time with an open squelch even with max squelch selected. The
interference was coming in through the antenna. It turns out that the
cast metal radio frame is ever so slightly wider than the older radio.
Widening the panel opening a tiny bit to let the radio slide about
0.020" further into the tray fixed the problem. I would also note that I
found it easy to remove and install the A210 without disconnecting that
front panel ribbon cable that has caused problems for some owners.
Confounding my trouble shooting was that my handheld VHF has had the
same problem with an uncontrollable open squelch when placed on the
glareshield. Battery powered but with the rubber ducky antenna. I don't
often use it like that and had not noticed exactly when it started to
misbehave other than it was a couple of years ago. It seems that RFI
from a Gemini glass ADI was contributing to that problem. A 0.001 uF
capacitor across the power connections in its Dsub connector quieted
that enough to make the handheld stop breaking squelch at least when it
is above the metal glareshield. Even easier would be one of these filters.
http://www.l-com.com/d-sub-capacitive-filter-emc-adapter-db9-male-female
Ken
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