Hello Wolfgang, Thanks for including links to your audio captures of the distorted received signals. The CW recording is more instructive, I think, but the SSB recording has similar character. To me it sounds as though you're tuned to the sideband of a wide CW signal, which I've heard on occasion. This results in the sound of modulated noise rather than a pure tone. This is very similar to reciprocal mixing, which occurs when a strong signal to which the receiver is not directly tuned mixes with the phase noise sidebands of the receiver LO. Since this distortion occurs on both CW and SSB modes, and apparently only on 40 meters, and then briefly until switching bands, I wonder if the K2 PLL VCO is at issue? I can't come up with a plausible transient failure that would cause what you observe, but will give it more thought. I don't believe the BFO circuit is the issue because that would be apparent on all bands.
I suggest doing a CAL PLL, then a CAL FIL to see if anything changes. 73, Mike, K8CN ______________________________________________________________ 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 Message delivered to arch...@mail-archive.com
