[time-nuts] Wenzel VHF PLO Oscillators Off Frequency
marklgoldberg at gmail.com
Sun Nov 12 19:46:50 EST 2017
Yes, exactly those. With no input, would they be expected to be 4 kHz off?
The spec for the standard part wants the input to be within 1e-7. I would
not expect them to be so far off free running.
I saw 13 MHz on the 500-14273 and stayed away from those.
Do you know of any part numbers that use 10 MHz in? Wenzel would not tell
me the exact specs of the 500 series parts available on ebay and only sent
me the specs for the standard 501-14057 that takes 10 MHz.
I have a couple 8642As and can generate any frequency I want with decent
phase noise, locked to my 10 MHz reference. I could try these frequencies
Do you know what the pll lock output does when the input frequency is off?
These toggle high for any frequencies I have put in.
Any other ideas are appreciated.
On Sun, Nov 12, 2017 at 5:19 PM, John Miles <john at miles.io> wrote:
> 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-bounces at 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
> > 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 <marklgoldberg at 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
> > > 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.
> > >
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