While using my shunt-fed tower and amplifier on 80 and 160 CW, the K3 keying became erratic. The problem went away when I unplugged the spare headset from the rear panel jacks. The front panel jacks aren't a problem, no doubt because their shields go right to the chassis. If you use the rear panel ones at high power, it would be wise to wrap the cord around a ferrite core. I didn't have any trouble with the other rear panel cables, but I put cores on them anyway.
My shack is a high-RF environment on those bands, as it's only about 10 meters from the tower, but it's probably not the worst the K3 is likely to see. (Field Day, expeditions?) I've had to take measures to keep RF out of other equipment, though not the 60 pound behemoth next to the K3. I haven't looked into it, but maybe there's an easy way to ground those rear panel jacks more directly to the chassis. (This is a classic cause of RF susceptibility.) If not, a few ferrite cores is a small investment. 73, Scott Scott Ellington Madison, Wisconsin USA ______________________________________________________________ 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
