From: David Cutter G3UNA
I take your point entirely which is why I said
"ALC is an analog signal for gradually reducing drive, which
might not be appropriate for shutdown."
Shutdown for me is for protection against gross overload and for this
another signal might be more appropriate. Since many users do not connect
ALC, some other signal for protection should/could be provided. The
problem yet again is that users might still ignore what the manufacturer
offers, so, the amplifier must protect itself.
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David,
It has always been my understanding that normal and good practice is for a
shutdown system to actually *shutdown* the entire transmitter affected in
the event of gross overload / failure, e.g. *abnormal* VSWR, cooling system
failure etc. A system which protects the amplifier only could still result
in damage to the exciter / driver under some circumstances of gross overload
/ failure, for example when using my K2/100 a while back during some contest
wind toppled a large pine across the antenna in use, the KAT100 sparkled and
both the KPA100 and K2 were damaged. My K2/100 is now protected by the total
shutdown system used with my other rigs, something that I should have done
before ever using the K2/100 at this location.
I take your point that the amplifier should be able to protect itself if
people ignore what is offered.
73,
Geoff
GM4ESD
.
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