Hello Hank I sympathize with these difficult issues - the KRC2 is out of date and its about time it was replaced but at least it has always been reliable. I have one and it has never suffered from RF getting into it. Sorry if the below is stating what is already obvious to you.
This may be a symptom of an RF in the shack problem. The 1ft line should not be a problem and as long as it is screened additional filtering should not help. Using RS232 may cure the symptoms but not the cause and your own BCD interface likewise. If it is an RF getting into the system problem, how might that be happening? A good way to check if it really is RF in the shack is to ask yourself if you have issues with lots of noise on the bands from the shack computer. As antennas are reciprocal, if you have significant coupling of RF back you will also have coupling of noise in. Obviously with 1500W the antennas will have to be a long way away from the operating position (for safety if nothing else) so we can probably rule out this being due to direct radiation from the antenna. I assume you have remote antennas and the array solution switch somewhere remote with a long feeder back to the shack. Maybe at the base of a tower. Could RF be getting back on the control lines from the remote switch? Are the control lines screened? Are they running close to the feeder. Putting ferrite on the switch control lines may help. Ditto the feeder. Burying the feeder helps a lot but isn't always practical. One of the worst configurations for this problem is a feeder on a catenary because it will pick up like an antenna, especially if you have an effective RF choke at the antenna end. If you have that arrangement, ferrites are the answer - plus a good short connection to your RF ground where the cable enters the house. The other possibility is you are using several feeders via the switch with an ATU in the shack. That's a problem because you will potentially have a bad match on the feeder in use, almost certainly a bad match on the feeders not in use which will result in the pickup from all the feeders merging at the switch. So, if the remote switch is actually in the shack I would investigate if you can improve the grounding and maybe move it somewhere else - like right next to the ground stake. Mike -- View this message in context: http://elecraft.365791.n2.nabble.com/KRC2-K3-tp7578647p7578668.html Sent from the Elecraft mailing list archive at Nabble.com. ______________________________________________________________ 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
