> 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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