Hello:
I just bought an AA-54 RigExperts analyzer. I am tuning a Buddipole which I use with my K3 (25+ countries and counting). The RigExpert says my SWR is 1:2.5 at 14.200Mhz. I also scan the SWR curve with it and I see that I am 1:3 or lower a couple of 100hz around the 14.200 center frequency. I hook my feedline up to my K3, put the KAT3 on bypass, set VFOA to 14.205Mhz and ask if the frequency is in use. I immediately see "HI SWR" on it. I can definitely use the KAT3 to tune out any reactance and my SWR/RF look reasonable (I hit 100on the RF Scale and the SWR meter doesn't go above 2). What am I missing here? I am trying to compare the SWR meter on the K3 against what the RigExperts claims as a learning exercise (1.5 month old ham here). 73 -aps ______________________________________________________________ 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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On Mon, May 9, 2011 at 6:03 PM, Jeff Cochrane - VK4BOF
<[hidden email]> wrote: > Hi Alexander, > I see this a lot with my K3. > The truth is that the KAT3 is never really out of circuit. > The trick is to enable the KAT3 (Hold ATU Tune), use it to show a low VSWR > to the rigs finals, then disable it (Hold ATU TUNE) again. > You will then find that the VSWR will presented to the rig will be correct > as per the analyser. > I don't why the KAT3 still appears to be in circuit when supposedly switched > out but at least there is a workaround. Funny I tried that too and still got HISWR cause that is what I thought was going on....but I did this particular test so fast and I might have changed my VFO making my observation invalid. I will try again...(and verify its ANT1!). 73 -aps ______________________________________________________________ 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 |
As a "confidence building" exercise, try it into a dummy load rather
than the amp. If it works into the dummy load, blame the input if the amplifier. 73, Don W3FPR On 5/9/2011 6:22 PM, Alexander Sack wrote: > On Mon, May 9, 2011 at 6:03 PM, Jeff Cochrane - VK4BOF > <[hidden email]> wrote: >> Hi Alexander, >> I see this a lot with my K3. >> The truth is that the KAT3 is never really out of circuit. >> The trick is to enable the KAT3 (Hold ATU Tune), use it to show a low VSWR >> to the rigs finals, then disable it (Hold ATU TUNE) again. >> You will then find that the VSWR will presented to the rig will be correct >> as per the analyser. >> I don't why the KAT3 still appears to be in circuit when supposedly switched >> out but at least there is a workaround. > Funny I tried that too and still got HISWR cause that is what I > thought was going on....but I did this particular test so fast and I > might have changed my VFO making my observation invalid. > > I will try again...(and verify its ANT1!). > > 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 |
In reply to this post by Jeff Cochrane - VK4XA
On Mon, May 9, 2011 at 6:03 PM, Jeff Cochrane - VK4BOF
<[hidden email]> wrote: > Hi Alexander, > I see this a lot with my K3. > The truth is that the KAT3 is never really out of circuit. > The trick is to enable the KAT3 (Hold ATU Tune), use it to show a low VSWR > to the rigs finals, then disable it (Hold ATU TUNE) again. > You will then find that the VSWR will presented to the rig will be correct > as per the analyser. > I don't why the KAT3 still appears to be in circuit when supposedly switched > out but at least there is a workaround. That works! I tried it last night (been busy). I had a 1.5 on my RigExpert and the K3 confirmed it. You absolutely have to tune it FIRST or the VSWR will be off. Seems strange. @Elecraft (Wayne/Eric/Alan, etc): Can you confirm this is by design? :-) And what does *bypass* do exactly? I would assume leave the circuit tuned based on the last push of the ATU button which of course maybe wrong depending on what frequency you are on (which is why I initially had a "HI SWR" message. 73 -aps ______________________________________________________________ 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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