On Tue,11/11/2014 3:26 AM, Nick-VE3EY wrote:
This happened with my KPA500 until I realized that my Microham double-six antenna switch is only rated to max 30MHz.
Nothing specific about this antenna switch -- getting any matrix switch like that to have low SWR at 6M is quite tricky to do. I had a similar problem with a different 2x6 switch on 6M -- rather high SWR. My solution was to not run my SteppIR through that switch. Instead, I feed it directly into one output of my KAT500. The matrix switch feeds a different input of the KAT500.
I also found that other "stuff" I had in series with the path between the KPA500 and the tuner was increasing to the SWR -- a not very good power/SWR meter and a tapoff for a monitor scope. I also found a few junk connectors connecting that stuff.
Bottom line -- when I cleaned up the signal path, SWR went from slightly more than 2:1 down to 1.1:1.
73, Jim K9YC ______________________________________________________________ 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]
