Mike, You are hearing the PLL reference transitions (Sverre explained it nicely), but they should be at a low level and not very noticable unless you listen closely.
If you happened to run CAL PLL without the bottom cover in place, those clicks will be louder than normal - so re-run it with the cover on. You may be able to reduce the intensity of the clicks/pops by moving the PLL reference voltages a bit - be certain 80/75 meters is entirely within the specified range. Of course, re-run CAL PLL after shifting the PLL range. 73, Don W3FPR ----- Original Message ----- > I have just completed "Test and Alignment, Stage II" of K2 #4137. > Everything seems to have gone very well -- all Voltages were in range and it > seemed that everything worked as it should. However, I've now run across a > strange problem. > > I find that clicks/pops occur when I tune the VFO in the presence of > strong signals. For instance, if I set the XG1 for 50uV and tune the VFO up > and down from the XG1's frequency of 7040kHz, I hear clicks/pops (about > S-5/6) when the VFO transitions the following boundaries: > > 7015.79/80 (click/pop getting very weak here) > 7020.79/80 > 7025.79/80 > 7030.79/80 > 7035.79/80 > 7040.79/80 (XG1's signal is theoretically centered at 7040.00) > 7045.79/80 > 7050.79/80 > 7055.79/80 (clock/pop getting very weak here) > > The clicks/pops occur when I roll the VFO's last two digits > back-and-fourth across the .79/.80 boundary. The clicks/pops do not occur > when I turn off the XG1. > > I have also noticed that I can hear these clicks/pops when I get up around > 7300 and strong broadcast stations are present. > _______________________________________________ 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
