Hi Here is a way to check the alignment of the filters. Assuming a 600 Hz sidetone tune to 4.000 MHz in CW normal mode You should hear the 4 MHz internal oscillator as a 600 Hz tone, Switch to each filter and the tone should not change frequency by more than a few hertz. Then switch to CW reverse and go back through the filters. Again the 600 Hz tone should not change. To check the SSB filters select LSB and tune to 4.00060. You should hear the same 600 hertz tone then check each SSB filter and the tone should not change. Now change to USB and tune to 3.99940 MHz and check for the 600 hertz tone on each filter. If you do not hear the correct tone on any of the above tests then you need to recheck the filter alignment for that filter. You may have it set on the wrong side of the filter slope or may need to move it slightly. Use spectrogram to re-align the filters after first setting them to the values listed in the manual so they are in the ballpark. You should move each filters BFO frequency slightly even if it is correct so the firmware will recalculate the sidetone offsets.
Don Brown KD5NDB ----- Original Message ----- From: <[EMAIL PROTECTED]> To: <elecraft@mailman.qth.net> Sent: Monday, March 13, 2006 7:05 AM Subject: [Elecraft] Filter alignment question > > Hi, > > I was monitoring the K2's local oscillator frequency and I noticed that as > I tune to WWV in the various modes, that the LO frequency is different at > zero beat. I expected an offset (w/respect to SSB) in the CW mode but I > expected the LO to be the same at zero beat whether I was in LSB or USB > modes. It isn't so I am wondering if something is not aligned properly. > > Any insight is appreciated. > > Thanks > > Mike, WA1SEO > K2 4778 > _______________________________________________ > Elecraft mailing list > Post to: Elecraft@mailman.qth.net > 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: Elecraft@mailman.qth.net 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
