[Johnson] Re: [Boatanchors] Johnson-Viking 122 VFO Freq. Jump

[Brian Clarke]

Hi Sherrill,

I didn't set out to tell you how to determine which was which. My point was that if 
it were silver oxide, then there would be no need to clean the contacts. If a sulphate 
had formed, there is no easy chemical process for removal - it'll have to be abrasion. 

I mentioned how Australian and British mil Morse keys got around the pivot and 
point corrosion problem. However, another correspondent pointed out that a brown 
powder formed on platinum - this was in built-up cities - probably pollution related.

Perhaps it might be better to shift to an all-enclosed key, like the one issued with 
the Australian A-510, or use a Hall-effect device as on some computer keyboards.
The chances of your persuading the oil companies to cease putting sulphur 
compounds in their fuels is close to 10^ -15.

73 de Brian, VK2GCE.
  Sherrill said:

  Brian: Sorry but now I am totally confused?? All I know is both the contact
  points and the pivot points can, over time, develop a "crud" that causes a
  high resistance to develop and will cause keying problems, especially in
  modern transmitters with low voltage on the key terminals. You did not
  explain to us how to determine if the problem is oxidation or sulphation?