[Heathkit] Amp Keying Interface?

[Greg]

That brings up a good question.
I wonder if a more or less standard sealed in glass set of contacts could be 
built into a fairly fast set of RF contacts ala SPST.
The reason I'm asking is because I have a parts drawer full of SPST switches 
sealed in clear glass.  They do react to a magnet ok but I don't know the 
subtle ins and outs of the subject (the engineering).
Anyone want to step up to the keyboard and fill in the blanks?
Tnx
Greg
WA7LYO
Kinston NC
----- Original Message ----- 
From: "jeremy-ca" <km1h at jeremy.mv.com>
To: <heathkit at mailman.qth.net>; "Peter Markavage" <manualman at juno.com>
Sent: Tuesday, July 31, 2007 5:20 PM
Subject: Re: [Heathkit] Amp Keying Interface?


>I dont know of any SS relays that can handle 1-2KW of RF. Correct me if I'm 
>wrong.
> Most SS switching that I'm aware of is via pin diodes and big ones aint 
> cheap. If you want a circuit you can get it off the Ameritron web site. Be 
> advised that they do not like high VSWR.
>
> The old Johnson T/R unit sucked out some RX signal and was also a TVI 
> generator.
>
> A relatively inexpensive way to switch is with vacuum relays. New or 
> barely used surplus is quite reasonable.
>
> Carl
> KM1H
>
>
>
>
> ----- Original Message ----- 
> From: "Peter Markavage" <manualman at juno.com>
> To: <heathkit at mailman.qth.net>
> Sent: Tuesday, July 31, 2007 4:41 PM
> Subject: Re: [Heathkit] Amp Keying Interface?
>
>
>> You said: "Johnson-style tube tr relays "
>> There's no relays in this thing. The antenna is always connected to the
>> transmitter. The receiver line is capacitor coupled to this connection
>> through a tube. RF Voltage cuts the tube off "preventing" RF from getting
>> into the receiver.
>>
>> Solid-state switching has made great advances over the last 30 years for
>> switching large amounts of RF currents. You might want to look into some
>> of the new solid-state linears to see how they handle switching large RF
>> currents.
>>
>> Pete, wa2cwa
>>
>> On Tue, 31 Jul 2007 16:23:55 -0400 <eugene at hertzmail.com> writes:
>>> 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
>>>
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