Hi Rick Well I have not heard about it either but the info I got from the company that makes the amplifier told me this. There is no shunt static discharge at the moment. The antenna is 27.5 meter vertical with a loading coil at the base of the antenna and it is DC grounded.
73 Rune ons. 13. jan. 2021 kl. 18:01 skrev <[email protected]>: > Send Topband mailing list submissions to > [email protected] > > To subscribe or unsubscribe via the World Wide Web, visit > http://lists.contesting.com/mailman/listinfo/topband > or, via email, send a message with subject or body 'help' to > [email protected] > > You can reach the person managing the list at > [email protected] > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Topband digest..." > > > Today's Topics: > > 1. Re: Oscillation in Narrow band tuned antenna. > (Richard (Rick) Karlquist) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Wed, 13 Jan 2021 08:54:34 -0800 > From: "Richard (Rick) Karlquist" <[email protected]> > To: Rune ?ye <[email protected]>, [email protected] > Subject: Re: Topband: Oscillation in Narrow band tuned antenna. > Message-ID: <[email protected]> > Content-Type: text/plain; charset=utf-8; format=flowed > > On 1/13/2021 3:13 AM, Rune ?ye 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 > > > ------------------------------ > > Subject: Digest Footer > > _______________________________________________ > Topband mailing list > [email protected] > http://lists.contesting.com/mailman/listinfo/topband > > > ------------------------------ > > End of Topband Digest, Vol 217, Issue 17 > **************************************** > _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
