My 5k tuner will do this too. It happens when the antenna's reactance gets too high. It'll match, but as the power level peaks it's no longer a good enough match and makes wacky things happen.
> On a perhaps related note, PSDR does not show that I have a tuner in about 1 > out of 10 starts. A restart then shows the tuner. Happens on mine all the time too. -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Jim Jannuzzo Sent: Thursday, February 17, 2011 11:51 AM To: [email protected] Subject: [Flexradio] ATU Behavior F5K, w/ ATU; PSDR 2.0.16, Fast 4 core, Win 7/64 I’m puzzled by the behavior of the ATU in my 5K. When set to AUTO and a 2.0 SWR threshold, I still sometimes get the red “High SWR” warning. Shouldn’t the ATU then start to tune, instead of just sitting there doing nothing? It doesn’t, and I have to manually start the tune process. Antenna is a dipole that is resonant on 40M. 2.0 or less SWR bandpath extends throughout the band, according to a trusty MFJ 259b. Reflected power at full TX level is 7 watts or less according to F5K meter. I have four DX Engineering 41 ferrites on my antenna coax as it enters the radio. (I had extras, and simply “store” them here.) No symptoms of RF-In-The-Shack. On a perhaps related note, PSDR does not show that I have a tuner in about 1 out of 10 starts. A restart then shows the tuner. Resetting the database, and routinely withdrawing all power to the radio overnight, does not change either symptom. Is it my ATU settings, my ATU hardware, or is there more work to be done on the ATU code? Jim KJ2P _______________________________________________ FlexRadio Systems Mailing List [email protected] http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flexradio.com/ Homepage: http://www.flexradio.com/ _______________________________________________ FlexRadio Systems Mailing List [email protected] http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flexradio.com/ Homepage: http://www.flexradio.com/
