> One thought. If you're going to operate SO2R and run > power, you should > probably use the bigger coax for the jumper, because the > more robust shield > can help interstation crosstalk. I did that in my shack > for that reason, and > it made a difference.
I'd be very surprised if that had anything to do with shielding Jim. Try this experiment if you have a network analyzer and an amplifier. take 30 feet of RG8X and wrap it tightly against another cable, but treat the ends properly. Terminate the amplifier end and measure cross talk signal on the other with the opposite end terminated. You'll measure virtually no crosstalk, certainly much less than -80 dB, with nearly any cable. Even very crappy Radio Shack cable that you can see through the braid is surprisingly good. After making dozens of measurements here, I concluded the major problems I had were from antennas coupling to antennas (even at 1000 foot spacing) and how connectors were mounted on radios and amplifiers, and things like BNC and phono connectors. I need to expand this page, but here is some actual data comparing coupling at 1/2 mile between antenna to ingress through the shield of one type cable. I think we far overestimate shield ingress. The real problem is poor connector mounting and grounding. (Sound familiar?) We use RG8X no problems, but I have cleaned up the grounding of connectors on all my RF equipment and panels. 73 Tom ______________________________________________________________ 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
