[BC] FW: [Tech-Assist] Harris SX-1 Spur Problem -- Brass vs frequency

[Lewis Munn]

Steve,
   
  Brass is used for the slightly higher conductivity for the RF currents, over steel.  I use it in AM (MW) when I am able...also use brass, copper, or bronze washers and lockwashers.
   
  I have never heard about not using brass at VHF, but the good VHF gear is always silver plate.
   
  Only possible thing I can think of is that the surface effect at VHF is such as to put the current flow into the tarnish area on brass, if is is tarnished, and causing high losses in the tarnish.  May be why so much is silver plated, tho I have seen a lot of tarnished silver running along just fine.
   
  Tuning lines in Harris FM transmitters, for one.
   
  Or just maybe poorly tightened brass works its way loose from steel threads with thermal cycling and loosens until it burns.
   
  I tend to think that this is more an urban legend tham factual.  But that is just my thinking.
   
  Looey Munn
  Roundup, MT

radioranger <radioranger at comcast.net> wrote:
  
I remember reading or hearing somewhere that brass screws are the fastener

		
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