Normand Martel wrote: > It's bizarre.. > > The oscillator is some kind of Colpitts but with coils > instead of capacitors in the feedback path. > > (i don't call it a Hartley, bcause Hartley's use a > SINGLE tapped inductor.) > > 73 de Normand VE2UM > > --- Dr Bruce Griffiths <[EMAIL PROTECTED]> > wrote: > > >> Hal Murray wrote: >> >>>> Is it okay to power up the main assembly once it >>>> >> is removed from the >> >>>> outer shell / insulation? >>>> >>>> >>> Lots of info here: >>> >>> > http://www.hparchive.com/Manuals/HP-10811AB-Manual.pdf > >>> I think I saw a warning about that, but maybe it >>> >> was something else. >> >>> >>> >> It is OK to power up the oscillator and output >> amplifier, but the oven >> circuit should not be powered up. >> >> Bruce >> >> _______________________________________________ >> time-nuts mailing list >> time-nuts@febo.com >> >> > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > > > > > ____________________________________________________________________________________ > Now that's room service! Choose from over 150,000 hotels > in 45,000 destinations on Yahoo! Travel to find your fit. > http://farechase.yahoo.com/promo-generic-14795097 > > _______________________________________________ > time-nuts mailing list > time-nuts@febo.com > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > Normand
It is in fact a Colpitts with unwanted mode suppression. At the desired oscillation frequency the feedback network is capacitive. At the undesired overtone frequencies one of the feedback components is inductive, and the circuit will not oscillate. Some form of mode suppression is required in most precision overtone oscillators. Bruce _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
