I have a CHA-250B antenna, but it is not currently up. This antenna is only rated for 250W SSB which is probably 100W on CW or a digital mode. I think this antenna has a matching network and at higher powers will saturate the cores causing SWR to rise out of control. Same thing happens for me with an EFHW antenna on 80M at 500W. This is a limitation with core matching networks.
Bruce, WB6IZG On Fri, Jan 12, 2024 at 9:29 PM Michael Reynolds, NO6O <mich...@no6o.com> wrote: > Greetings, > > I joined this list today, after sending a message to Elecraft support, > describing a similar problem. I have an Icom IC-7610, with the KPA500 > and KAT500, and my SWR spontaneously climbs into the red sometimes > during transmissions. It takes some effort to correct it, and I > typically lose a QSO in the process. The relays go nuts trying to > re-tune, and sometimes produces a fault condition. Usually, I can > correct it by restarting both the amplifier and tuner. I have a Comet > CHA-250HD, which has a almost a flat 1.1 SWR from 80m to 6m. I don't > need a tuner while barefoot. However, when I first hooked up the > KPA500, the SWR was not flat, and added the KAT500 this week, which led > to my SWR issue. > > I hope the cause and resolution can be determined. > > Michael > NO6O > > > ______________________________________________________________ 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 Message delivered to arch...@mail-archive.com
