Mark, This was addressed several months ago concerning the KX3. When the software gets ready to display SWR, it reads forward power, and a fraction of a second later, reverse power. Since voice peaks go up and down, the displayed SWA will not be accurate unless you use a steady signal.
Mark KE6BB -------- Original message -------- From: Mark N2QT via Elecraft <[email protected]> Date:08/19/2014 12:15 PM (GMT-08:00) To: [email protected] Cc: Subject: [Elecraft] K3 false SWR indication with SSB My k3 flashes a higher swr indication with ssb voice peaks than with a steady carrier. If using an antenna with 1:1 SWR the bar graph flashes the first segment. If swr is 1.5:1 all the segments illuminate on voice peaks, as if swr was greater than 3:1. To reduce the uncertainty introduced by my antennas, I connected a 50 ohm load after an external tuner so I could create the 1.5:1 SWR, and got the same results. I assume this is a benign problem and likely caused by the non simultaneous sampling of FWD and REV power by the CPU. However, if no one else sees this I'll do some more checking. FW 4.81/2.83 and TX Gain Cal done recently. Mark. N2QT ______________________________________________________________ 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 Message delivered to [email protected] ______________________________________________________________ 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 Message delivered to [email protected]
