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@aol.com
To: km1h@jeremy.mv.com ; w9ac@arrl.net ; amps@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@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@arrl.net>
To: "amps" <amps@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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> http://lists.contesting.com/mailman/listinfo/amps
>
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