[Elecraft] K3 mobile

[David Cutter]

Cheap RTVs such as used in bathroom sealant has a vinegar smell and will attack copper.  In a small confined space inside a radio that's not good.  In an open outdoor environment where the gas can escape it's not such a problem.  Dow Corning and others make RTVs with benign contents, but at a considerable increase in cost.  

Surface mount components have practically no exposed copper and pcb tracks are not exposed, so, I wonder whether the acetic acid attacks the tin coated contacts.

David
G3UNA
  ----- Original Message ----- 
  From: Bob 
  To: mzilmer at verizon.net 
  Cc: elecraft at mailman.qth.net 
  Sent: Wednesday, October 22, 2008 7:35 PM
  Subject: Re: [Elecraft] K3 mobile


  OK...  May I ask why?

  I have seen it done in commercial products and I recently did it when I was assembling
  my SoftRock receivers because of my concerns with the #30 wire breaking.

  The two reasons I might think of would be any detuning effect or fear of the material used
  attacking the wire insulation.  

  Any wisdom on this subject out there?    I did not see or am not aware of the Elecraft
  advisory.

  73,
  Bob
  K2TK


  mzilmer at verizon.net wrote:

    I have seen the use of dope, sealers and so on strongly discouraged by Elecraft.
    matt, W6NIA


    Oct 22, 2008 10:30:51 AM, km5q at mac.com wrote:

      There are at least two ferrite core transformers in the K3 that are 
      supported only by their thin wires. I'm concerned that they may not 
      survive a mobile environment. It would take only a dab of RTV 
      (silicone adhesive sealant) to secure them, but I don't know if this 
      has been discusses or approved.

      Windy KM5Q
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