Fw: HIgh swr on 6m
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Posted this to support but no reply yet, maybe on a well earned summer break?! Anyone here help?
Thanks, Stewart, GW0ETF ----- Forwarded Message ----- >From: Stewart Rolfe <[hidden email]> >To: "[hidden email]" <[hidden email]> >Sent: Monday, 22 July 2013, 9:10 >Subject: HIgh swr on 6m > > > >Hi, > > >Just tried 6m for the first time on #145(!) and getting high swr into a well matched antenna as well as a dummy load plugged directly into either antenna socket; around 2.1/2.6:1 and high enough for tx calibration to fail. > > >All other bands fine so wondering if I should check the low pass filter? > > >73, >Stewart Rolfe, GW0ETF > > 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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Stewart, do you have an amplifier attached? I have found that having my Clipperton L in the circuit causes high SWR on 6 meters, but if I connect direct to the antenna switch the SWR on my SteppIR is low as it should be.
Willis 'Cookie' Cooke K5EWJ & Trustee N5BPS, USS Cavalla, USS Stewart ________________________________ From: Stewart Rolfe <[hidden email]> To: "[hidden email]" <[hidden email]> Sent: Tuesday, July 23, 2013 10:09 AM Subject: [Elecraft] Fw: HIgh swr on 6m Posted this to support but no reply yet, maybe on a well earned summer break?! Anyone here help? Thanks, Stewart, GW0ETF ----- Forwarded Message ----- >From: Stewart Rolfe <[hidden email]> >To: "[hidden email]" <[hidden email]> >Sent: Monday, 22 July 2013, 9:10 >Subject: HIgh swr on 6m > > > >Hi, > > >Just tried 6m for the first time on #145(!) and getting high swr into a well matched antenna as well as a dummy load plugged directly into either antenna socket; around 2.1/2.6:1 and high enough for tx calibration to fail. > > >All other bands fine so wondering if I should check the low pass filter? > > >73, >Stewart Rolfe, GW0ETF > > 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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In reply to this post by GW0ETF
I have seen higher SWR with amplifiers connected in-line but not
energized. It seems I saw this in recent tests I made with my Mirage A1015G (10w/150w), so I did a quick check. I ran 5w with the K3/10 so I could use the 5A element (25-60 MHz) in my Bird power meter and tested into a dummy load to start with. had 1.0 SWR indicated by the K3 and zero reflected showing on the Bird with power adjusted exactly to 5w forward. Then I inserted the 6m PA and got exactly the same readings. I did see forward power shift about 0.2w so its not a perfect match. I repeated the test with my 3-element 6m yagi as load. Straight connection shows 0.25w reflected and SWR=1.5. I got exactly the same measurements when the amp was inserted. I would not have been surprised to see a change in readings with the antenna load since it is not a perfect match. Getting a good match is often not realized with the open frame relays that are commonly used in ham amplifiers ------------------------------------------------------------------- While I had everything set up I decided to measure the amp output with my 100H and 500H elements. With 6w drive I found I get 100w output showing with the 100H and 110w showing with the 500H. With power set to full output of 8w 130w is displayed with the 500H element. I typically claim it will do 125w. -------------------------------------------------------------------- Subject: Re: [Elecraft] Fw: HIgh swr on 6m Message-ID: <[hidden email]> Content-Type: text/plain; charset=iso-8859-1 Stewart, do you have an amplifier attached? ?I have found that having my Clipperton L in the circuit causes high SWR on 6 meters, but if I connect direct to the antenna switch the SWR on my SteppIR is low as it should be. ? ? Willis 'Cookie' Cooke K5EWJ & Trustee N5BPS, USS Cavalla, USS Stewart 73, Ed - KL7UW http://www.kl7uw.com [hidden email] "Kits made by KL7UW" ______________________________________________________________ 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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______________________________________________________________ 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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In reply to this post by GW0ETF
Thanks to all who replied. You fellas really make me feel stupid when you remind me what important details I've forgotten to include like is the KAT3 included....
Well yes, I do have the KAT3 and with some help from Gary in Support I found the IF trap on the board (L10/C10) was causing the high swr on 6m. No obvious damage to the components but for now I've bypassed the trap as recommended by Gary and all is well. Thanks again...! 73, Stewart, GW0ETF
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