I have an AL80A with an internal QSK 5 switch (one of the early ones)
that I've had since new (S/N 095). For well over 20 years, it's been
working flawlessly. Recently, though, I had some 160 m antenna
problems under high power and blew the fuse lamps that protect the rx
PIN diodes. Blowing these is no biggie as it's happened before when I
mis-selected an antenna or has a switch set wrong. I replace them and
go on my merry way.
WIth K3LR's help, may 160 m antenna seems to be going again. So, as a
final smoke test, I stated testing it under high power. But, this
time I'm seeing the fuse lamps light up when I transmit with more
that a few hundred watts on 160 m into a dummy load. I don't see this
on 80 m or any of the higher frequencies. As far as I know, this is
new, though I've never had much of a 160 m antenna and so didn't use
the amp it much down there.
I'll check the schematic, but does anyone have an idea or two about
what might be going on?
73,
Kim Elmore, N5OP
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