[Heathkit] Amp Keying Interface?

[Rick Brashear]

When the amplifier is not keyed it's a straight though connection, so it
would automatically go back to the receiver.  Am I thinking incorrectly?

Rick/K5IAR



Sure, you can shut the driver down, but how does that get the antenna
connection hanging on the output of the amplifier back over to the
receiver.

As Carl said, for switching 1 to 2KW RF, vacuum relays are also a good
way to go. I don't know of any off-the-shelf solid-state relays that can
handle that much power.

Pete, wa2cwa
 
On Tue, 31 Jul 2007 18:36:24 -0500 "Rick Brashear" <rickbras at airmail.net>
writes:
> Why not switch pre-amplifier and avoid the high rf problem?  Of 
> course, if
> you're switching a high wattage transmitter instead of using an 
> outboard
> amplifier the situation would be different.  
> Rick/K5IAR
> 
> 
> -----Original Message-----
> From: heathkit-bounces at mailman.qth.net
> [mailto:heathkit-bounces at mailman.qth.net] On Behalf Of jeremy-ca
> Sent: Tuesday, July 31, 2007 4:21 PM
> To: heathkit at mailman.qth.net; Peter Markavage
> 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
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