[Heathkit] Amp Keying Interface?

[jeremy-ca]

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 ($$) , but this
>> thread
>> got me to wondering if anyone made a solid state TR relay that can
>> handle 100W? (I mean one for <$50!)
>>
>> Eugene, w2hx
>>
> _______________________________________________
> List Administrator: Duane Fischer, W8DBF
> ** For Assistance: dfischer at usol.com **
> $$ 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
>