Check your connections. Loose or poor PL-259s. Also check to see if the antenna is close to something causing it to arc over. I had one antenna that used ladder line with solid conductors. Due to it moving around in the wind one of the conductors developed a break which tested fine under low power or with an analyzer but would have problems at higher power. I've since moved to Davis RF copper clad stranded ladder line.
Dave wo2x -----Original Message----- From: [email protected] <[email protected]> On Behalf Of Stephen Rabinowitz Sent: Sunday, September 15, 2019 7:58 PM To: [email protected] Subject: [Elecraft] Reflected power My KPA-1500 switches from operate to standby due to reflected power more than 200w whenever drive power exceeds about 8 watts on 7 MHz. The forward power at that point is about 400w. The antenna is a double bazooka that shows an SWR of about 1.2 on a RigExpert AA-230Pro antenna analyzer. A Telepost LP-100A digital wattmeter shows SWR 1.3 with Z=52, R=49, Ph=17, and X=15. The KP1500 tunes to an SWR of what it labels 1.1 on that frequency. The latest firmware, version 2.27 is installed. This problem does not occur with double bazooka antennas on 80m or 30m, or with Yagis from 20m to 6m. It seems to me that there is a brief surge in reflected power at the very onset of the transmission that triggers the response, but that the reflected power quickly decreases to normal levels of just a few watts. Any ideas for dealing with this problem would be much appreciated. 73, Steve K2SN ______________________________________________________________ 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]
