[Amps] Relays

[jeremy-ca]

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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