KAT3 don't tune
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Hello,
I have worked CQWW SSB this weekend and noted that kat3 don't tune correctly. Many times after tuning SWR is 1.2 or 1.3 even there is no more swr on antenna. I have dipole on 160 meter and swr is under 3 to1 on band, but kat3 try and try long time and leave it 1.8 if at all. My K2 with KAT100 work correctly with these same antennas. What is the problem? juha - oh6os K2 #4781 K3 #2100 |
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Hi I have the same problem, but with a twist to it. I even got Elecraft to send me a replacement KAT3, but it did not help anything. By chance I tried one of the older configurations (call it config B) and then all of a sudden the ATU worked excellent (able to tune a 80m loop and a 17m dipole on all bands from 80m thru 10m ... Yes even the dipole!... Both antennas use 450 ohm ladder and 4:1 baluns. By the way, now the ATU works better than ever before. It never before was able to tune the 17m dipole on 30m, 40m or 80m - but now it is! BUT now with config B something weird happens when the rig is switched ON. The TX symbol flashes like in test mode, but there is no audio and the TX LED goes on when keyed. I have not found any other way to get out of that mode than to make the EE Init reset. Having done the EE Init I can only make the rig "see" the KPA3 and the KAT3 by loading a config file. If I try manually to use CONFIG to select ATU Auto I hear relays clicking, when selecting KPA3 I dont hear any fans going in the fan test and leaving the KPA3 in norm and leaving the CONFIG it seems that the rig doesn't see either KAT3 or KPA3. As soon as I load config B all works again and the ATU too ... Until next time I switch ON the rig. Then it needs another EE Init and config load. If I load config A the ATU doesn't work, but now the rig can be switched OFF and ON without problems. I can not see any difference between config A and B and I don't know why the rig configuration should influence the functioning of the ATU. Also my K2 works fb with its ATU. So the problem is not in the hardware or antenna, but something else. Elecraft is looking into it. OZ4UN Poul-Erik -----Oprindelig meddelelse----- Fra: [hidden email] [mailto:[hidden email]] På vegne af Juha - oh6os Sendt: 31. oktober 2010 19:32 Til: [hidden email] Emne: [Elecraft] KAT3 don't tune Hello, I have worked CQWW SSB this weekend and noted that kat3 don't tune correctly. Many times after tuning SWR is 1.2 or 1.3 even there is no more swr on antenna. I have dipole on 160 meter and swr is under 3 to1 on band, but kat3 try and try long time and leave it 1.8 if at all. My K2 with KAT100 work correctly with these same antennas. What is the problem? juha - oh6os K2 #4781 K3 #2100 -- View this message in context: http://elecraft.365791.n2.nabble.com/KAT3-don-t-tune-tp5691912p5691912.html Sent from the [K3] 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:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ 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 |
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Thank you for information.
If I first tune 1810 kHz then 1820 kHz and so on... It tunes very well 1.0 to 1 rather wide band because impedance is near 50 ohm in 1810 kHz. But, if I tune first 1870 then 1860.... It doesn't tune very well because first trying was bad. I think that problem is in software not hardware. juha - oh6os 2010/11/1 Poul Erik Karlshøj (PKA) <[hidden email]> > > Hi > I have the same problem, but with a twist to it. I even got Elecraft to > send me a replacement KAT3, but it did not help anything. > > By chance I tried one of the older configurations (call it config B) and > then all of a sudden the ATU worked excellent (able to tune a 80m loop and a > 17m dipole on all bands from 80m thru 10m ... Yes even the dipole!... Both > antennas use 450 ohm ladder and 4:1 baluns. By the way, now the ATU works > better than ever before. It never before was able to tune the 17m dipole on > 30m, 40m or 80m - but now it is! > > BUT now with config B something weird happens when the rig is switched ON. > The TX symbol flashes like in test mode, but there is no audio and the TX > LED goes on when keyed. I have not found any other way to get out of that > mode than to make the EE Init reset. Having done the EE Init I can only make > the rig "see" the KPA3 and the KAT3 by loading a config file. > > If I try manually to use CONFIG to select ATU Auto I hear relays clicking, > when selecting KPA3 I dont hear any fans going in the fan test and leaving > the KPA3 in norm and leaving the CONFIG it seems that the rig doesn't see > either KAT3 or KPA3. As soon as I load config B all works again and the ATU > too ... Until next time I switch ON the rig. Then it needs another EE Init > and config load. > > If I load config A the ATU doesn't work, but now the rig can be switched > OFF and ON without problems. > > I can not see any difference between config A and B and I don't know why > the rig configuration should influence the functioning of the ATU. Also my > K2 works fb with its ATU. So the problem is not in the hardware or antenna, > but something else. > > Elecraft is looking into it. > > OZ4UN > Poul-Erik > > -----Oprindelig meddelelse----- > Fra: [hidden email] [mailto: > [hidden email]] På vegne af Juha - oh6os > Sendt: 31. oktober 2010 19:32 > Til: [hidden email] > Emne: [Elecraft] KAT3 don't tune > > > Hello, > > I have worked CQWW SSB this weekend and noted that kat3 don't tune > correctly. > > Many times after tuning SWR is 1.2 or 1.3 even there is no more swr on > antenna. > > I have dipole on 160 meter and swr is under 3 to1 on band, but kat3 try and > try long time and leave it 1.8 if at all. > > My K2 with KAT100 work correctly with these same antennas. > > What is the problem? > > juha - oh6os > K2 #4781 > K3 #2100 > -- > View this message in context: > http://elecraft.365791.n2.nabble.com/KAT3-don-t-tune-tp5691912p5691912.html > Sent from the [K3] 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:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > 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 |
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