I like to use Spectrogram, and setup markers for 500 & 600 Hz, these are the tones most often heard on WWV, and then use that to zero beat WWV. With that setup I was able to get down to where I was 9.997 or 8 for the 10 Khz WWV signal. -
David Wilburn [EMAIL PROTECTED] K4DGW K2 S/N 5982 On Sun, 2007-12-02 at 19:04 -0600, paul wrote: > Hi, > > Recently I started to upgrade my K2 (sn 2592) with the KPA100 kit. Before > I could complete the KPA100 though, I had to upgrade the K2 from rev A to > rev B. I have completed all the revs except for the firmware upgrade - > Elecraft sent only the MCU but not the IOC. It is now being mailed. > > Before the rev, the frequency on the dial matched the received frequency. > Now WWV is received on 10.012 MHz. I have done the calibration of the 4MHz > several times - checking with a known good receiver (AOR AR7030+). I can > vary the c22 and zero beat exactly on frequency (USB and LSB) - also at > higher harmonics (16Mhz). I ran an antenna wire next to the 4MHz xtal and > listen on the SW receiver. > > After the 4MHz calibration, I have run the CAL PLL and then modified every > CAL FIL entry afterwards. Still no change. The dial reads 7.010Mhz when > hearing 7MHZ and 14.020Mhz when hearing 14Mhz. > > Otherwise, the receiver is excellent - much better than before. Had a low > volume problem before, now it is really loud. Did all the RF and contol > board changes, BFO temp stability mod, PLL upgrade, AF gain smoothness, > VFO ALC 10/12 meter band pass filter, AGC threshold (R1 from 51k to > 22.5k). I have checked for bad solder joints or bridges - nothing wrong > that I can see. > > I did not do the second crystal filer flatness mod or the sidetone mod > yet. Also no firmware had been changed yet. Any ideas what to check? > > Thanks, > > Paul > AD5IW > > Here are some measurements when receiving 10MHz WWV: > > TP3 14913.05 > TP2 4913.19 > TP1 12089.38 > > Dial: 10011.99 > > -------------------Range measurements > PLL > min: 12083.69 > max: 12094.29 > range: 10.60 > > TP3 > min: 14906.04 > max: 14919.09 > range: 13.05 > > BFO > min: 4916.99 > max: 4912.59 > range: 4.40 > > R30: 4.34V 10MHz > 5.70V @ 4MHZ > 2.02V @ 3.5Mhz > _______________________________________________ > 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 _______________________________________________ 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
