Re: [time-nuts] Wenzel VHF PLO Oscillators Off Frequency

With help from an number of people who responded, I have gotten the Wenzel oscillators to work and provide a frequency locked external clock to a Perseus SDR radio. I had to add an external clock input to the Perseus and describe it at: https://sites.google.com/site/perseusmods/ Mark W7MLG

Re: [time-nuts] Wenzel VHF PLO Oscillators Off Frequency

Hi If the device pulls > 50 ppm at 80 MHz, it’s a wide range VCXO with a heater on it :) That is way more than you can pull a proper (low ADEV) OCXO. Bob > On Nov 13, 2017, at 5:04 AM, Mark Goldberg wrote: > > On Sun, Nov 12, 2017 at 7:02 PM, Mark Goldberg

Re: [time-nuts] Wenzel VHF PLO Oscillators Off Frequency

On Sun, Nov 12, 2017 at 7:02 PM, Mark Goldberg wrote: > > On Sun, Nov 12, 2017 at 6:38 PM, John Miles wrote: > >> >> Most of the 100 and 200 MHz bricks I've seen work with either 5 or 10 MHz >> . I don't know if I've seen any 80 MHz units that do. All

Re: [time-nuts] Wenzel VHF PLO Oscillators Off Frequency

On Sun, Nov 12, 2017 at 6:38 PM, John Miles wrote: > > Most of the 100 and 200 MHz bricks I've seen work with either 5 or 10 MHz > . I don't know if I've seen any 80 MHz units that do. All of the ones > I've bought on eBay have been from the customer-proprietary 500- series >

Re: [time-nuts] Wenzel VHF PLO Oscillators Off Frequency

> 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. That does seem like a lot. I'd expect a few hundred Hz of error at the most. > I saw 13 MHz

Re: [time-nuts] Wenzel VHF PLO Oscillators Off Frequency

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 Fr

Re: [time-nuts] Wenzel VHF PLO Oscillators Off Frequency

y, 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. > > >

Re: [time-nuts] Wenzel VHF PLO Oscillators Off Frequency

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 thing

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

Re: [time-nuts] Wenzel VHF PLO Oscillators Off Frequency

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

Re: [time-nuts] Wenzel VHF PLO Oscillators Off Frequency

Hi It’s pretty certain that there is no PLL inside an 80 MHz low phase noise OCXO. If it is 4 KHz off frequency at 80 MHz, that gets you into the 50 ppm range. Either it is running on a really odd crystal spur or it’s not at the right temperature. Drifting around by 100’s of Hz ( = ppm’s at

Re: [time-nuts] Wenzel VHF PLO Oscillators Off Frequency

The seller has replaced it with one that does the exact same thing, which is weird to have two fail in the same way. They are getting hot and the frequency varies with the input voltage, so I tended to guess not the heater as I don't think it could pull that far over temp, and it always is high.

Re: [time-nuts] Wenzel VHF PLO Oscillators Off Frequency

Hi As a guess - the oven circuit has stopped working. Next step would be to tear it open and trace out the schematic. After that make reasonable guesses for any parts that are poorly labeled. Much of what shows up on eBay has been through the ringer in China. A high percentage the OCXO's I get