Also have this problem with capacitor-adjusted tuning. No matterhow careful you turn, stiction causes the adjustment to jump in the direction of the turn. Don
John Miles >> Great insight thanks. You nailed it: out with the old oscillator and in with >> one >> that doesn't have that problem. >> >> Btw the mechanical tuning issue you mentioned is essentially the same exact >> problem: even the slightest turn will make the frequency jump too high or >> too >> low. It can drive you (and the loop) crazy trying to get it on-frequency. > > Whenever I've seen this behavior, it has always been caused by uncertainty or > "quantization" on the part of the trimpot's wiper, rather than anything that > could be blamed on the varactor. What would be a good example of a TCXO or > OCXO model that exhibits EFC hysteresis? I don't immediately understand what > could cause this phenomenon, and I'd like to reproduce it here to see what's > happening. > > -- john, KE5FX > Miles Design LLC > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > -- "The power of accurate observation is commonly called cynicism by those who have not got it." -George Bernard Shaw Dr. Don Latham AJ7LL Six Mile Systems LLC 17850 Six Mile Road Huson, MT, 59846 mail: POBox 404 Frenchtown MT 59834-0404 VOX 406-626-4304 Skype: buffler2 www.lightningforensics.com www.sixmilesystems.com _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.