Re: Elecraft Digest, Vol 17, Issue 32

[JohnChanceRead]

Bear in mind that many of the chassis screws are used to secure 'earthing  
joints'.  The use of a lubricating oil or copper slip will indeed reduce  
electolytic corrosion but may well also introduce some resistance, as all  
lubricating oils/greases will leave a thin skin even under pressure.   However
'petroleum jelly' despite being a very good insulator has a lubrication  factor of 1
and any pressure (via the screw threads) will break through the skin  and make
good contact. It will of course also cover the joint and limit  corrosion.
IMHO.
John G4BOU
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[Ian Stirling, G4ICV, AB2GR]

On Thursday 29 September 2005 10:15, [hidden email] wrote:

> Bear in mind that many of the chassis screws are used to secure 'earthing  
> joints'.

  Recently I learned how important electrical contact
at these screw points is.
 I had low speaker output and I thought the band
conditions were the reason. I noticed at some point that
in picking the K2 up from the left side, the volume
increased and the leftmost LED on the signal strength
meter disappeared. I removed the bottom panel and on
screwing it back with power applied, turning the screw
created electrical noise. I worked it back and forth
until the noise disappeared and now the K2 is much more
sensitive and louder.
  With no other K2 to compare, I hadn't realised there
was a problem.

Ian, K2 4962, G4ICV, AB2GR
--
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