Craig, Yes, this is a known bug that will require a K3 firmware change. When using semi break-in CW the P3 does not "mute" properly on transmit so you are seeing the transmit IF signal. It's on the list.
Alan N1AL On Fri, 2011-01-14 at 08:06 -0700, Craig D. Smith wrote: > To avoid confusion, please note that this posting is not about the recent > 0.50 firmware upgrade, but rather behavior with the previous release-level > version. > > I'm experiencing some curious behavior from the P3 on CW that perhaps some > of you can help explain. Certainly not a show-stopper, but sometimes mildly > annoying. > > I notice this mainly during contests when I'm using my contest program to > key the K3 via the KEY input. I see a spurious signal displayed on the P3 > that is 800 Hz above my xmit frequency. At first, I thought this was an > actual signal, but soon realized it was some kind of display artifact from > keying the K3. It looks like a regular CW signal, and has a maximum > amplitude of about -80 dBm. It seems to be generated during closures of the > KEY input to the K3. It appears to be independent of power level or the CW > pitch frequency. Same result using antenna or dummy load. > > This is MUCH less of a problem when using the internal K3 keyer via the > PADDLE inputs. If I hold down the paddle to generate a string of dits, the > P3 display freezes at the baseline noise level and the spurious indication > does not appear. On the other hand, if I generate a series of dits with the > paddle by making a sequence of rapid contact closures of the dit paddle, the > spurious P3 indication does appear. > > In other words, it appears to have something to do with how the K3/P3 > handles the "freezing" of the P3 display during CW transmit, especially in > the event of rapid keying contact closures. > > Any ideas? > > Thanks and 73 Craig AC0DS > > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > 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:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
