Damon, The procedure in the manual is written for the "average" filter (of which very few exist), so I highly recommend you use the procedure documented on my website www.w3fpr.com dealing with K2 Dial Calibration instead of the procedure in the manual. The entire procedure involves 3 steps - first adjusting C22 using the N6KR method which needs no tools if you have perfect pitch, but those without it can use Spectrogram or a similar computer application to tune WWV "right on". After setting C22, run CAL PLL followed by CAL FIL. The article has several links to supporting information should you need it.
BTW - I am working on a Technical Note document that may be placed on the Elecraft website in the future dealing with exactly this same information - stay tuned, but in the meantime, use the information on my website. Once calibrated, the K2 will not "drift" because the settings are stored in digital form and are not dependent on any oscillator other that the PLL reference. I know that many K2s that I have worked on have retained their calibration information for several years. If you have trouble with the CAL PLL or CAL FIL routines not storing data into EEPROM, that is a separate problem and must be resolved before you attempt the calibration and filter alignment procedures. 73, Don W3FPR On 7/24/2011 7:05 PM, KC5CQW wrote: > About twice a year I like to run through the cal's on my K2. > Today, I was unable to store the BFO adjustments to eeprom and I noticed > that the USB audio sounds muddy. > Almost like the RF pot was turned down and the 2k audio filter active. The > RTTY (USB) mode also sounds like this. > LSB and CW are quite loud and clear with a more believable S-Meter response. > > I was following the C22 cal Application Note procedure. > The last few times I did this, the K2 "cal'ed" to within 10Hz of WWV. > Before starting the cal today, it was 70Hz off. It is now within 30Hz post > cal. > The difference between TP1 and TP2 is negligible (limited by 10Hz DAC). > My beat dial Freq. is/was 10.000.02 LSB (at this point when I triple checked > the C22 cal) > > I used a soundcard program to "watch" the 10MHz WWV 500Hz and 600Hz tones > while adjusting the BFO settings. > Once it comes back to OPT1 from FIL4 the audio tones are back at their > starting points and not were I set them. The BFO value did seem to save > however. In LSB, the S-Meter showed S-3 (as did my other HF rig), on USB the > meter was a solid S-9. > The volume was not as loud and had more bass. > > I have a feeling this is just a matter of me forgetting a simple step but I > can honestly say that I have followed the procedure word for word. I even > double checked with the main K2 manual just to be sure. > > 73, Damon > ______________________________________________________________ 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
