[Amps] Relays

[Steve Cook]

You can parallel several RJ-1 relays -- speed and current rating.
  ----- Original Message ----- 
  From: Harold Mandel 
  To: Amps 
  Sent: Sunday, March 30, 2008 5:00 AM
  Subject: [Amps] Relays


  When I first saw a Jennings RJ-1, and
  compared it to the open frame relay my
  '220 was using, it was astonishing.
   
  That was because vacuum relays are
  good for isolation.
   
  However RJ-1's are virtually useless
  for a decent QRO rig above 20 meters
  and that's because the RF ampacity
  diminishes so rapidly with frequency
  change.
   
  On bigger tube rigs it was necessary to 
  graduate to an RJ-2, but remember, those
  vacuum relays only carry 12 amps at 32MHz.
   
  So then there's the Jennings RF-10C.
   
  The problem with getting vacuum relays with
  enough contact gusto is they slow down because
  of mass and inertia. The RF-10C is not too good
  at 50WPM as you can imagine.
   
  So it's a toss-up: You get a relay capable of
  high speed QSK and it has poor ampacity and
  blows out frequently, or you get an elevator
  contactor.....
   
  Hal
  W4HBM
   
   
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