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[AMPS] High-SWR protection

To: <amps@contesting.com>
Subject: [AMPS] High-SWR protection
From: W8JI@contesting.com (Tom Rauch)
Date: Mon, 30 Oct 2000 06:59:05 -0500
> 2. use the SWR alarm relay to apply cutoff ALC voltage to the exciter;
> this method protects the amplifier's relays, so it's better than just
> de-keying the amp.

If the relays in the amp are properly sequenced, dropping the relay 
line won't hurt a thing.

If they are NOT properly sequenced, you had best fix them so they 
are. Otherwise you are leaving yourself open to bandswitch 
damage and other load-fault related problems in normal operation. 

I'd be reluctant to use application of ALC voltage as the sole means 
of shutting off the exciter, because ALC lines can be a bit slow and 
you also must depend on an external negative supply. Anything 
gets unplugged or shorted and you have no protection.

If I used ALC, I'd be darned sure I also dropped the antenna relays 
during a fault.


73, Tom W8JI
w8ji@contesting.com

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