[BC] RG-8

[Mike McCarthy]

Dow Corning #4 becomes partially conductive/lossy above 50Mhz.  I 
have seen a demonstration which saw a connector become lossy at 
150mhz as well as show an increased impedance bump.  Now, UHF 
connectors are not impedance stabilized anyway.   But this test 
showed a much greater aberration.  As a rule, I won't apply DC 4 
across a conducting joint above 30Mhz. I will use it on most any 
surface with a gasket at any frequency however to help mate the 
silicone rubber O-rings.


MM

At 04:40 PM 4/6/2008, Ron D wrote:

>When I worked for a Motorola MSS back in the '60's in Missouri we 
>would put Dow Corning DC 4 silicon grease on the mating surfaces of 
>the PL 259 and SO 239 to keep any moisture out and wrap them with 
>Scotch 33 black plastic tape and never had a failure.  To this day I 
>still put the grease in any outside connectors no matter what type 
>they are and its never caused a problem.  It doesn't take a lot, 
>just enough to displace any moisture that would otherwise get in.