Hi Don, Thank you for your response. When I try the freq. range test, there is no freq. change. I searched the reflector and found an earlier email response authored by yourself with the subject of: K2 PLL range test SN 05233. That person had a similar issue, so it would seem I can start tracking down the problem based on your diagnosis in that email. 73, Byron N6UI
Don Wilhelm-4 wrote: > > Byron, > > Don't be too concerned about the 4 MHz oscillator calibration at this > point in your assembly process. Once you have completed your K2, you > can refine the calibration - see the K2 Dial Calibration article on my > website www.w3fpr.com for "the rest of the story". > > Yes, 12650 is higher than the high end of the range should be, but > please tell me what the low range is - while in CAL FCTR, tap BAND+ and > tell me what the frequency is, then tap BAND- and again tell me what the > displayed frequency is. Perhaps I can craft an answer to the possible > trouble spots from that information. > > 73, > Don W3FPR > > Byron Viets wrote: >> Hello everyone. I purchased my K2 kit about 4 years ago and as life >> would >> have it, I rarely have time to work on the beast except during holidays >> etc. >> More time for amateur radio would sure be nice, but I'm not near >> retirement >> and for some reason I keep getting pesky bills in the mail. Anyway here >> is >> my situation: >> >> 1) I am at the Alignment and Test, Part II portion and trying to get >> through >> the 4 MHz Oscillator Calibration section. >> 2) When I take a freq. measurement at TP3 for the PLL with the frequency >> probe, I get a reading of ~12650, obviously way too high. >> 3) I inspected parts, soldering etc and cannot find a fault. >> 4) Decided to do some signal tracing and performed a measurement of the >> reference oscillator signal on pin 1 of U4. My reading is .51, instead >> of >> the expected 0.8-1.8. Vrms. >> >> So my question is this: >> >> It seems that the 12650 measurement is so high that it may be an >> indicator >> that the X1 crystal in the PLL oscillator is defective. However, with the >> low reading on pin 1 of U4 I'm not so sure about the crystal. Could the >> increased frequency reading at TP3, cause the voltage drain on the U4 or >> am >> I barking up the wrong tree? >> >> I've looked through the email archives and haven't found anything quite >> similar to my issue. I hate to start pulling stuff apart if the crystal >> is >> the issue and would like to hear what others think of the problem. >> >> > ______________________________________________________________ > 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 > > -- View this message in context: http://n2.nabble.com/PLL-Reference-Oscillator-Question-tp4219007p4219481.html Sent from the Elecraft mailing list archive at Nabble.com. ______________________________________________________________ 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
