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There is a Canadian product that is excellent for
connections....it's called Stabilant 22
and has been around for years. It is a contact
enhancer.
It is quite expensive but you only need a tiny drop
of it. I've used it on all kinds of co-ax
connectors and most of my repeater desense went away after applying this stuff.
It's produced by DW Electrochemicals in Richmond
Hill Ontario.
73 John VE3AMZ
----- Original Message -----
Sent: Sunday, June 05, 2005 8:52 PM
Subject: [Repeater-Builder] Micor Mobile
Repeater - No Audio?
Many years ago, my friend W8ICN told me of a cure for the invisible
corrosion on Micor pins that they had developed at Detroit Edison. I couldn't
remember what it was, so I dropped him an email about it. Here is his
reply.
Dan Hancock N8DJP
We used a mixture of Squibb mineral oil and isopropol alcohol, about a 1:3
ratio, 1 part mineral oil and 3 parts alcohol. With the boards
unplugged, coat the pins and sockets using a small artist brush. The
alcohol evaporates quickly leaving a fine coat of oil on the pins which
inhibits corrosion. Works well. Do not scrape the pins otherwise
you will be removing the plating causing even bigger problems. Of course if
the pins are corroded to start with, gently clean off the gunk before applying
the oil and alcohol.
Dan
Daniel Hancock wrote:
Read the messages below.
What was the "magic solution" you guys at
Edison used to help with this probelm? It was a mixture of two
things....mineral oil and something maybe???
Message:
18
Date: Sat, 04
Jun 2005 21:42:21 -0700
From: Mike Morris <[EMAIL PROTECTED]>
Subject: Re: Micor mobile
repeater - no audio?
At 07:00 PM 6/4/05, you wrote:
>Hey
gang,
>
>I've got a "Repeater Builder" UHF micor converted
mobile
repeater running
>great for several years.. Last week
sometime it stopped
passing audio..
>dtmf, etc... I can key
it fine from places like usual,
but it doesn't
>seem to pass any
audio.. Would this be more of a
controller issue or
>possibly
something awry with my micor? Its running a
CAT250
>controller. Comments appreciated
ofcourse.
>
>Rod
>NJ
First clean the inter-board
pins.
Power it off, remove all the screws that mount the boards
that
plug into the center board, and unplug them halfway,
then plug them back
in several times i.e. "stroke" the
male pins in and out of the female
connectors (and get
your mind out of the gutter). I've seen several
Micors
develop weird problems that were temporarily "fixed"
that
way. The fix lasts 6 months to a year, and I've
yet to come up with
a cure other than soldering them
all, which - while the problem is fixed
- makes the
radio unrepairable in the future. The problem
seems
to occur much less often in mobiles, but does occur.
Same
problem happens to Mitreks, but Moto came
up with a fix for that ...
replacement connectors with
different metallurgy in the plating of the
contact pins.
Mike WA6ILQ
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