Lucia, The KX3 SWR reoports the input value to the KXAT3 that it has found after tuning. That value may be quite different than the SWR measured at the antenna.
If you want to check the calibration of the SWR metering in the KX3. set the ATU MD menu parameter to BYPass and do a TUNE. OTOH, if the ATU MD menu is set to Auto, the tuner should do a TUNE and then report the SWR that results. 73, Don W3FPR On 9/19/2012 12:23 AM, luca de marinis wrote: > Hi Don, yes I agree with you that if I measure the swr between the radio and > the antenna I will have the same value I measured with the antenna analyzer. > > The Automatic Tuner is installed and the mane ATU MD on AUTO > > My point is: > > Why do I read ON THE KX3 swr GRAPH a peak value close to 2.0 when I transmit? > > Why do I read the real SWR of the antenna - in my case 1.4 - when I hold XMIT > to activate TUNE? > > Thanks > > Luca > > > > > > > > > On Sep 18, 2012, at 7:12 PM, Don Wilhelm <w3...@embarqmail.com> wrote: > >> Lucia, >> >> You say that you had an SWR of 1.4, then used the ATU which lowered the >> SWR to 1.0 >> OK, That was on the KX3 display. >> >> Please tell us where you were reading the continued 1.4 SWR. The KX3 >> display does not show the SWR during transmit - only during a TUNE. >> The SWR shown externally to the KX2 ATU will not change, so if you are >> using an external device, you will not see any change in the SWR reading. >> >> The KX3 ATU will reduce the SWR between the KX3 output PA and the input >> to the KXATU3 to the value shown during on the KX3 display during a >> TUNE, but the SWR between the KXATU3 and the antenna (as measured by an >> external device) will not change. >> >> 73, >> Don W3FPR >> >> On 9/18/2012 8:14 PM, luca de marinis wrote: >>> Hi, >>> >>> I completed my KX3 #1715 few days ago and today I went to the park and >>> using a Buddipole I tried to make some contacts. Buddipole swr was 1.4 on >>> 20m so I used the ATU. It worked fine lowered the swr to 1.0 but then I >>> transmitted I still could read a 1.4 swr. I moved up and down the band and >>> tuned again and every time the ATU started from 9.9 and did the all cycle. >>> Sometime couldn't go lower than 1.4. Sometimes after tuning the power was >>> reduced to 2W >>> >>> Am I missing something. I did a search on the reflector but didn't show >>> anything. >>> >>> Thank you in advance for your help >>> >>> >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:Elecraft@mailman.qth.net >> >> 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:Elecraft@mailman.qth.net > > 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:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
