[Heathkit] Amp Keying Interface?

[Duane Fischer, W8DBF]

Wasn't there a product known as "Soft Key" that served to interface the 
SB-220 to a solid state transceiver? It was silent, other then the normal TR 
relay in the SB-220 closing. Ker Chunk!

In fact, come to think of it, I have several of the home brew TR relay 
interface cables around here yet.

Duane Fischer, W8DBF/WPE8CXO
dfischer at usol.com
HHI: Halligan's Hallicrafters International
http://www.w9wze.net
HHRP: Historic Halligan Radio Project
hhrp.w9wze.net

----- Original Message ----- 
From: <eugene at hertzmail.com>
To: "Robert Nickels" <W9RAN at oneradio.net>
Cc: <heathkit at mailman.qth.net>
Sent: Tuesday, July 31, 2007 4:23 PM
Subject: RE: [Heathkit] Amp Keying Interface?


> This is a very interesting thread. I have often wondered how to best
> make a silent TR relay.  I have a standard dow 115vac relay in my
> station with some aux contacts for muting that makes a real racket!  I
> have always seen the Johnson-style tube tr relays ($$) , but this thread
> got me to wondering if anyone made a solid state TR relay that can
> handle 100W? (I mean one for <$50!)
>
> Eugene, w2hx
>
>
> -----Original Message-----
> From: heathkit-bounces at mailman.qth.net
> [mailto:heathkit-bounces at mailman.qth.net] On Behalf Of Robert Nickels
> Sent: Tuesday, July 31, 2007 3:35 PM
> To: Peter Markavage
> Cc: heathkit at mailman.qth.net
> Subject: Re: [Heathkit] Amp Keying Interface?
>
> Peter Markavage wrote:
>> Solid-state switching is quick, quiet, and reliable.
>>
> Exactly.
>
> Five bucks will buy a nice solid state relay that will happily switch
> your 120v amplifier from a low current DC input and give you a couple of
>
> KV of optical galvanic isolation for your rig to boot.   Why mess
> around?
>
> For example:
> http://www.allelectronics.com/cgi-bin/category/500500/Solid_State.html
>
> Or your local industrial control distributor.
>
> 73, Bob W9RAN
>
> _______________________________________________
> List Administrator: Duane Fischer, W8DBF
> ** For Assistance: dfischer at usol.com **
> $$ See the vintage area on the HCI web site - http://www.w9wze.org $$
> Heathkit mailing list
> Heathkit at mailman.qth.net
> http://mailman.qth.net/mailman/listinfo/heathkit
> _______________________________________________
> List Administrator: Duane Fischer, W8DBF
> ** For Assistance: dfischer at usol.com **
> $$ See the vintage area on the HCI web site - http://www.w9wze.org $$
> Heathkit mailing list
> Heathkit at mailman.qth.net
> http://mailman.qth.net/mailman/listinfo/heathkit
>
>
>
> -- 
> No virus found in this incoming message.
> Checked by AVG Free Edition.
> Version: 7.5.476 / Virus Database: 269.10.22/923 - Release Date: 7/27/2007 
> 6:01 PM
>
>