With my K3 terminated in a dummy load and the preamp off, I can just barely hear the decoder pulses. I checked it in both CW and SSB, and I set both modes to 1 KHz bandwidth and adjusted the shift for the same center frequency of 600 Hz. With the preamp on they are more noticeable, making the S-meter briefly tick up to about S2 if I tune quickly. When I stop tuning, of course, the pulses disappear so I'm not sure they would ever actually hinder me from making a QSO.
Here's an interesting quirk ... possibly just my imagination but I don't think so. I have the subreceiver installed, and if I engage it so that I can simultaneously hear the main receiver in my left ear and the subreceiver in my right ear, tuning the subreceiver across 28005 creates louder decoder pulses in the main receiver than it does in the subreceiver. Then again, I have never found as many birdies in the subreceiver as I have found in the main receiver, and those I've found in the subreceiver are at least ten db weaker than their main receiver counterparts. I do not hear any birdie at that frequency, though. If I listen very, very hard with the preamp on, I can hear a tone just under the background noise, but I have to tune the VFO to hear the changing pitch in order to detect it. Without the preamp on, it is impossible to hear it at all. It isn't a birdie, though ... the pitch changes smoothly and slowly as I tune across it. I have found (and removed via SIG RMV) a few other birdies on 10m, on my rig 28005 isn't one of them. I do believe that tuning artifacts vary quite a bit from K3 to K3, though, so you may be experiencing a much greater problem than I am. If so, you may want to consider making an audio recording of it so that the rest of us can hear it. 73, Dave AB7E Jan Erik Holm wrote: > When 10m opens up this will be a serious problem. > > On 28005 KHz a quite strong birdie carrier, on > each side of this carrier there are "tuning pulses > generated from the encoder in the segment 28000 to > 28010 KHz. All this gets stronger with Preamp ON. > > Is it only my K3? Or is this on all of them? > > Any solution? > > This internal carrier might be removed with the > new FW but any solution for this tuning puls > problem. > > 73 Jim SM2EKM > > ______________________________________________________________ > 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 > > ______________________________________________________________ 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
