Mark, Yes, your math is correct, and since your BFO is at a lower frequency than the IF, that should give you LSB output - something strange is going on here.
Let's take this off-reflector after this note, because we may have to exchange a bit of detail information. It may be of interest to some, but the specifics are not common for most cases, and I don't want to cause boredom for other builders for your specific problem - you can report the results to the list after we figure things out. The VCO frequency is within the realm of reason, we do not need to look at that further. Did you move the slug of L34 up near the top of the can? If you would remove the [Elecraft} from the subject in your reply, that will make your reply more obvious to me (it will go to my inbox rather than the Elecraft folder - which I peruse more quickly than my inbox). Go to Tom Hammond's website www.n0ss.net and download Spectrogram (it will be near the end of the page). I will help you get it setup if necessary, but I need to know how your filter bandpass looks on the Spectrogram display before I can draw any conclusions or offer any suggestions. My initial guess is that your actual filter bandwidth is much wider than expected (indicating a problem with the filter itself), and your passband may be straddling the zero frequency point - but all that remains to be seen. 73, Don W3FPR > -----Original Message----- > > > Tune to 7000 and put the counter probe into TP1 and tell me what the > > frequency reading is there (in CAL FCTR mode) - 11915 kHz is expected. > > 7000.00MHz CW, St P of 0.60 > > at TP1: 11914.18 > TP3: 12094.20 > TP2: 4913.60 > > If my math is correct, mixing 7000.00 and 11914.18 should have an > output at 4914.18. Is this the expected value? Is it on the 'correct' > side of the IF filter? (Keep mind that my C22 has not been set, its > just at the midpoint.) > > > ... so we would have to look at your > > test setup - is it possible that you are driving a very strong > signal into > > the K2 and you are actually hearing both sidebands? > > I hear the incorrect sideband when using the filter settings shown on > page 89 of the Rev F manual. I hear both sidebands when using the > filter settings that Gary Surrency sent me. > > Yes I was using a strong signal -- the high output from an XG2 with > the preamp still ON. I have now switched to the lower output on the > XG2 and turned the preamp off. Still hearing the wrong sideband. > > I guess a wrong IF frequency would explain the problem with tuning the > IF can, but I'm still baffled about how the IF frequency can be wrong. > By the way, I can match the XG2 to the spot tone (do we still call > this zero-beating?) at 7037.60 on the display, but the tone goes down > when I turn the freq dial up towards 7040. > > > -- > No virus found in this incoming message. > Checked by AVG Free Edition. > Version: 7.1.392 / Virus Database: 268.5.3/331 - Release Date: 5/3/2006 > > _______________________________________________ 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
