[AMRadio] Dow Corning DC 4

[Kimberly Elmore]

Hi Jim,

DC-4 is used all over the place on electrical connections in aircraft, 
especially in ignition systems. I've attached Dow Corning's spec sheet for 
aerospace applications in case you don't have it. I've used the stuff 
extensively and my experience has been that it's essentially inert. One way to 
test it's applicability for higher frequencies might be to put a bit in a small 
container in microwave along with a cup of water. Run the system for about 30 s 
and see if it gets warm. Honestly, I think you'll be fine.

The weather has become nice again! I should set up another visit with you so we 
can lash one of you VFOs into the Champ and see if everything works right. If 
so, it's in the VFO unit and I'll bet "dollars to doughnuts" that the problem 
resides with one (or all) of the old, mica capacitors becoming contaminated with 
the contact cleaner I used.

73,

Kim N5OP




________________________________
From: Jim Wilhite <w5jo at brightok.net>
To: Discussion of AM Radio in the Amateur Service <amradio at mailman.qth.net>
Sent: Tue, September 20, 2011 10:11:42 AM
Subject: Re: [AMRadio] Dow Corning DC 4

That is what prompted me to look about for the Dow Corning product.  At 
the local auto parts store they sell what the call bulb grease.  I 
purchased a packet some time back for a connector that I installed on my 
trailer and there was just enough for that one connector.   It is in a 
small packet like those sent with antennas.  There is no identification 
of what is contained in the packet so I decided to look for the DC 4 
alternative.  Not only that but they charge a lot of money for the small 
packets.

I am guessing it is the same thing, but no one could tell me and I did 
not want to contaminate the connector should it not be compatible.

Jim/W5JO


----- Original Message ----- 

> Another alternative is to check with the parts department at a local 
> car
> dealership.  Ask the clerk that you are looking for the chemical that 
> is
> used in the sockets of the taillights, etc.
>
> This product is generally light brown in color and is used to prevent
> moisture build-up in the sockets thus preventing corrosion.
>

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