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 _________________
73 Rick N6RK _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
