Dear all, I ran through the K2 filter aligment considering all your tipps and tricks. I also adjuest the reference oscillator on the control board again. My filter bandwidths are 1.5 kHz, 700 Hz, 500 Hz and 200 Hz (Filter FL1 to FL4).
I have used Spectrogram to align the filters. The settings are matching with zero beat tests on a carrier. Now Fliter FL1 to FL3 are working perfectly. I can switch through the filters and the tuned signal stays with maximum amplitude in the filter with minimum frequency change. The strange thing: Filter FL4 was not working. So I have set it's bandwidth to 2 kHz and analysed the passband By tuning over a carrier observing the peak in spectogram. I have seen, that the center frequency of FL4 is different from FL1 to FL3! How can that be, because the Filter settings FL1 to FL4 are controlling the same electrical filter?!? Regards Martin _______________________________________________ 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
