Wayne, Thanks for the fast reply. I think I had this issue only two times (am not sure if both were the same band) perhaps during 3 hours or so, but what you are saying would explain why I couldn't reproduce it. If it were RFI, I would expect it to happen all the time which doesn't seem to be the case.
Just one more question: are you saying the LC data is not loaded before I transmit in a "new" segment, just like e. g. the Smartuner? The ATU doesn't follow the VFO when I am only in rx mode? Thanks in advance Vy 73, Ralf, DL6OAP Am 02.05.2013 um 17:33 schrieb "wayne burdick [via Elecraft]" <[email protected]>: > Ralf, > > Like the K3's ATU, the KX3's ATU stores up to 32 segments of LC data on each > band. On 160 m the segments are 10 kHz wide (1800-1810, 1810-1820, etc.). > Anytime you move the VFO into a new segment, then transmit, the ATU will > reload the last-used LC data for that segment (or the closest segment for > which data has been stored). If the data is the same as for the previous > segment, nothing will change. If it's different, the LC data will be sent to > the ATU's relays, and the "ATU" icon will flash. > > Note that this will not happen until after you pause 1/2 second in your > transmission. This way we don't mess up the timing on your first transmission > if you were in CW mode. > > My guess is that you moved the VFO into a new segment where you had > previously tuned up into a different load, so that the LC data was a little > different. > > There are a couple of things you might want to do. If you changed antennas, > you can optionally go into the ATU MD menu entry and hold CLR to erase all of > the ATU LC data for the current band. Then retune the ATU in the part of the > band you use, as needed (when SWR is high). > > A more exhaustive approach might be useful if the antenna's SWR varies widely > across the band (often the case on 160 m): Tune up the ATU ahead of time on > every segment. That is, set the VFO to about 1805, tune the ATU, then move to > 1815 and tune the ATU, etc. This is usually overkill, but it would optimize > the LC settings ahead of time for a narrowband antenna. > > You might try the above and let me know what happens. > > Another possibility is that you simply have very high SWR resulting in RFI. > If that were the case, reducing power to a couple of watts would reduce RFI > and the symptoms would go away (or at least be different). My guess is that > this is not what's happening; you're just seeing the ATU retune in new > segments. > > I'll also send you our latest field-test firmware which is likely to be > released as beta later today (rev 1.47). It has significant stability > improvements that could have some bearing on ATU-related problems. > > 73, > Wayne > N6KR > > > On May 2, 2013, at 1:16 AM, DL6OAP <[hidden email]> wrote: > > > Hi, > > > > I received my KX3 one week ago and had some fun yesterday with it and an > > end-fed wire antenna roughly 20 mtrs long. The ATU worked great on getting > > the SWR down to 1:1 (not on 160) but there was an issue that concerns me: > > while transmitting, the ATU icon in the display went flashing and the SWR > > changed…. > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > > > If you reply to this email, your message will be added to the discussion > below: > http://elecraft.365791.n2.nabble.com/KX3-antenna-tuner-intermittend-operation-tp7573335p7573346.html > To unsubscribe from KX3 antenna tuner intermittend operation, click here. > NAML -- View this message in context: http://elecraft.365791.n2.nabble.com/KX3-antenna-tuner-intermittend-operation-tp7573335p7573348.html Sent from the Elecraft mailing list archive at Nabble.com. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
