[Boatanchors] Sealing Cobraheads and other Inv Vee Dipole questions

[Philip Atchley]

Hi Glenn,

Thank you.  that's what I was afraid of (in regards to RTV).  Following 
your tip I just paid a visit to our local auto parts store to get some 
sealer.  almost everything out there now seems to be RTV, blue, black or 
clear.  But Eureka!  Permatex DOES make one that they call  "Ultra Grey" 
that is non corrosive and is "sensor safe".  The Permatex part number is 
599BR for the 3.5 oz tube (they also had smaller tubes).

And, to prove the point that you made.  After writing the first Email, I 
disassembled the 2nd Cobrahead.  Unlike the first that appeared to have 
used some older type of black gasket compound, the second one used clear 
RTV.  The hardware and coax braid in the first one was as shiny as the 
day it was made.  In the second Cobrahead the nuts and other hardware 
was corroded and the braid was all discolored!

73 de Phil  KO6BB


Glenn Little WB4UIV wrote:

>
> Standard RTV cures by releasing acetic acid. Acid is corrosive to 
> metals. No a good choice. If you must seal with RTV use a type that 
> cures with alcohol. This can be had from an auto parts place and is 
> listed as oxygen sensor safe. It can also be had from good electronic 
> supply houses.



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