Sounds like something in your antenna circuit is overheating and causing the resonance to change. I had that same thing happen with a trap antenna and finally a coil in the antenna burned up. I was running about 500 watts on 160. So I build an inverted L for 160 and I am using that will good results when my rotator dial starts turning and the control box smokes. New I am buying a new rotator and i am not planning to run power on 160 any more. I cannot afford it. WB5OXQ ----- Original Message ----- From: "M. K. Hess" <[email protected]> To: <[email protected]> Sent: Saturday, July 18, 2009 12:16 PM Subject: [AMRadio] Odd tuning on 160M
> Hi Folks, > > Here's a question that may need to get filed under "dumb", or maybe not, > but > here goes! > > I have a V-Beam, a Vertical, and a Dipole, all capable of 160M operation. > I > use a K3 as my exciter, an Alpha 91B as an Amp, and > a Palstar AT-Auto for the tuner. The following happens with any of these > antennas, including my dummy load (Heath CanTenna)... > > I have the Alpha in Stby, and key up the K3 w/ 10w through the Palstar to > "whatever" load.... If finds a 1:1 match and all is well. > If I advance the K3 to 120W all remains well... Can Xmit all day and > night, > without issue. NOW.... > > I fire up the Alpha 91B, and begin to tune it.... after a couple of > seconds, > the Palstar starts to "re-tune" the load. I wait until it settles, and > start the Alpha load again, same thing... this happens a few times until > finally the Palstar thinks it's got a match, AND the Alpha thinks it's > happily loaded... > > Finally, I hear someone calling.... I call back... as I'm talking, the > Palstar starts re-tuning again and the Alpha usually goes into Hi-SWR > shutdown... > I fiddle with them for a bit, and try the call again.... Sometimes it > stays > stable, most times it goes haywire several times during the QSO... > > WTF is going on!?!?!?! > > I have grounding out the ying-yang, and no RF back to the station, I have > heavy duty parts from the shack to the antennas.. (See my web > www.n3eaq.net > for details) > This mostly seems to happen on 160 and 80 and DEFINITELY on 1885 when I'm > trying to do AM! > > Any ideas!?!?!?! All help is appreciated! > > Mike - N3EAQ > > ______________________________________________________________ > Our Main Website: http://www.amfone.net > AMRadio mailing list > Searchable Archives: http://www.mail-archive.com/[email protected]/ > List Rules (must read!): http://w5ami.net/amradiofaq.html > List Home: http://mailman.qth.net/mailman/listinfo/amradio > Post: [email protected] > To unsubscribe, send an email to [email protected] with > the word unsubscribe in the message body. > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > > > ______________________________________________________________ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/[email protected]/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: [email protected] To unsubscribe, send an email to [email protected] with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
