David. Your situation as described in another email seems very similar to mine. I am operating a K2/10 with an indoor antenna, a closed loop approximately 20m in circumference with the feedpoint about 2m directly above the K2. The loop is fed via the KAT2, some 2.5m of RG-213 and an Elecraft BL-1 balun at the feed point. I have no RF ground, being in an upstairs bedroom. When connected to the power supply, the K2 is grounded through the electrical supply earth, but I have never noticed any difference when operating it from its internal battery, completely isolated.
In over 6 years of operating, including frequency-sensitive digimodes, I have never noticed any frequency shift of the K2 TX frequency. I just attempted, by holding the FT-817 with whip antenna right next to my K2, to test for sensitivity to UHF, while monitoring a PSK31 station on 20m, and there was no perceptible change in frequency. Therefore I wonder if you should look elsewhere for the cause of the problem. Before investigating inside the K2, is your power supply immune to RF? Does the voltage change in the presence of RF? -- Julian, G4ILO K2 s/n: 392 K3 s/n: ??? G4ILO's Shack: www.g4ilo.com Zerobeat Ham Forums: www.zerobeat.net/smf On 10/14/07, David Woolley <[EMAIL PROTECTED]> wrote: > I checked the transmit frequency relative to the receive one with a > dummy load, at 10 watts, and there is no problem. It's possible that > this is simply a combination of my voice and the filter settings, but it > could also be that RF on the chassis is upsetting the BFO and/or > reference oscillator control voltages. Is this a known issue? _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
