[Amps] Relays

[jeremy-ca]

It requires a few healthy sized open frame relays doing duty in the DC circuits and two good old Dow Keys for the RF. At least thats what is used here on the AM KW station.

A D-104 handles the actual switching, Im too old and lazy to do it with 2-4 individual switches as some did in the old days.

Carl
KM1H


That setup is AM only.

Carl
KM1H


  ----- Original Message ----- 
  From: TexasRF at aol.com 
  To: km1h at jeremy.mv.com ; w9ac at arrl.net ; amps at contesting.com 
  Sent: Wednesday, April 02, 2008 2:59 PM
  Subject: Re: [Amps] Relays


  I always wondered how to achieve that "Thuuuuung" sound at key down.

  73/k5gw



  In a message dated 4/2/2008 12:39:57 P.M. Central Standard Time, km1h at jeremy.mv.com writes:
    With a real amp the blower noise would mask the relay sound (;

    Besides, real hams wear noise eliminating headphones (;(;

    Except on AM that is and then the various relays clunking is part of the 
    expected nostalgia sound.

    Carl
    KM1H


    ----- Original Message ----- 
    From: "Paul Christensen" <w9ac at arrl.net>
    To: "amps" <amps at contesting.com>
    Sent: Wednesday, April 02, 2008 1:46 PM
    Subject: Re: [Amps] Relays


    >> The RJ-1 type of relay can also be completely silent if you mount it
    >> with a few drops of silicone seal or on a piece of soft rubber. Mount it
    >> directly to metal if you like to hear it click!
    >
    > Good suggestion, Vic.  Although typically, that's half the solution.
    > Generally, cabling going to the relay's pins contributes much to sound
    > conductivity.  For example, RG-213/214, RG-142 and coaxial cable of other
    > sizes are often found terminating directly onto the relay's pins.  With
    > RG-213/214, the wiring size can become the limiting factor in the
    > transmission of the relay's sound -- even if the relay is shock-mounted.
    >
    > I cut small 1"-2" loops made from ultra-flexible silicone HV wiring and 
    > use
    > it to bridge the end of the coax to the relay pin.  The loop creates a
    > cushioning effect.  Not much of a length, just enough to let the relay's
    > vibration dampen and dissipate in the wire.  Same with the coil pins, if
    > necessary.  Between shock-mounting the relay and using the flexible HV
    > wiring, all that is left is a slight tick -- but still not as quiet as a 
    > PIN
    > diode <g>.
    >
    > Paul, W9AC
    >
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    > 

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