On 1/13/2021 3:13 AM, Rune Øye wrote:
I have been told that Oscillation in Narrow tuned antennas can occur and
make damage to your equipment, radio or amplifier. It is really the first
time I have heard about this potential issue. On 160m band, I use a
Can you give us more details on this theory? I've never heard
of it. Maybe it is something that only applies to modern LDMOS
devices?
Reason for asking is that I have burned the final transistor in my radio
and the final FET`s in my PA is broken. It all happens “out of the blue”.
The first question I would ask is whether you have a shunt RF choke to
provide a DC ground for the antenna. If you do, verify that the
connections to it are reliable. I mounted a backup RF shunt in a
little metal box with RF connectors that hangs off the output of
my radio to make sure static never blows up the radio, no matter what
antenna I connect it to. This was after I left the radio connected
to a dipole that didn't have DC short across it and blew up the first
transistor in the receiver.
73
Rune LA7THA
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73
Rick N6RK
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