Sounds like he's talking about the small 'bricks' that Wenzel sells with internal PLL-disciplined OCXOs. Some of these expect oddball input frequencies. Just looking at the 80 MHz parts on the shelf around here, 500-14273 wants a 13 MHz input, 500-25010 uses 24.576 MHz, and 500-25009 uses 19.2 MHz. So that's probably the issue, if two of them seem to be failing the same way.
-- john, KE5FX Miles Design LLC > -----Original Message----- > From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob > Camp > Sent: Sunday, November 12, 2017 2:03 PM > To: Discussion of precise time and frequency measurement > Subject: Re: [time-nuts] Wenzel VHF PLO Oscillators Off Frequency > > Hi > > I guess my point was more that there is not a VCO / PLL combo in an OCXO. > > If dropping the supply gets you on frequency, then you have moved things a > lot > with that voltage change. 50 PPM is a lot of delta T on any normal OCXO > crystal. > That strongly suggests there is something wrong in the control circuit. > > Bob > > > On Nov 12, 2017, at 2:52 PM, Mark Goldberg <marklgoldb...@gmail.com> > wrote: > > > > The standard oscillator, 501-14057 ( > > www.wenzel.com/wp-content/parts/501-14057.pdf) will lock to an > external 10 > > MHz reference and this one is marked "80 MHz" and "15V on the label. > Maybe > > someone swapped the labels. I did try lowering the supply voltage. It got > > to 80 MHz at about 11V and still did not lock to the reference. This > > oscillator is specified at 1e-6/year aging. That is way less than it is off > > now. > > _______________________________________________ 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.