Bob, I had issues earlier, but only on 80 meters. I posted a message to this reflector about large transmit spurs in the 5 MHz region when transmitting on the low end of 80 meters. I discovered this because the SWR wouldn't drop with an external tuner. Early on I noticed that a different antenna tuner worked, but my old trusted Johnson Matchbox didn't. I spent a lot of time putting chokes on every lead imaginable. While troubleshooting, 80 meters quit working on the Matchbox, but still worked on the other bands. I had another Matchbox and noticed the problem went away. I am using open wire line and apparently the band switch on the first Matchbox is going bad. That meant the balanced feeders were no longer getting a balanced drive, and were radiating. Now everything is back to normal.
I assume you don't have these issues with your other HF rigs. I have a device from MFJ, the 854, that measures RF current. It has a snap on toroid that couples to the wire or feedline. I noticed the highest readings on the power cord. I don't know if you are running an amplifier, but I am only running 100 watts. I have all the equipment grounded to a common point with braid, which runs to a ground rod, but still had issues on 80 meters. I suspect a random wire might create similar issues. In general, I think the 5000A is more suspectible to RF than most gear. Also, be sure the PC is grounded to the same ground bus. You might want to change antennas. Don't assume coax shields RF. Coax and suffer from common mode currents on the shield. Maybe you've already done this. Also did you install the Firewire cable with the choke on the rig end? Hope this helps! 73, Steve N6VL -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of R.Haighton Sent: Tuesday, November 27, 2007 2:11 PM To: flexradio@flex-radio.biz Subject: [Flexradio] 5K HF Lockup I find the 5KA to be an excellent device on 80, 40,M but am having troubles on higher frequencies with HF Lockup after transmitting. It seems that the transmitter stays on and the only way to switch off is by removing power from the 5000A then re-booting Power SDR I have tried extra chokes on all the leads ands using a direct connection to a Dummy load as well as various grounding systems - all to no avail. Has anyone else met this problem and if so what is the solution?. 73 Robin Haighton VE3FRH -------------- next part -------------- An HTML attachment was scrubbed... URL: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/attachments/20 071127/1c35bb0c/attachment.html _______________________________________________ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/ _______________________________________________ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/
