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

[Mark Goldberg]

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

[Bob Camp]

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 
> 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 of the ones
>>> I've bought on eBay have been from the customer-proprietary 500- series
>>> with unusual input frequencies.
>>> 
>>> 
>> I swept the input from 1 to 100 MHz. They lock at 38.4 MHz in. Yes they
>> are 4-5 kHz off when free running. Locked they are right on frequency.
>> 
>> Mark
>> 
>> 
> I have one more question.  Does anyone know if when unlocked it is possible
> to apply a tuning voltage to the Phase Lock Voltage monitor pin? What good
> is it to have an OCXO that needs to lock to a external frequency and is 4
> kHz off when unlocked? When locked, it comes up on frequency from first
> power on, so why would an oven be needed at all?
> 
> If interested, take a look at my qrz.com page for links as to why I am
> doing this. I have fallen down the rabbit hole of more accurate frequency!
> 
> Thanks,
> 
> Mark
> W7MLG
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Re: [time-nuts] Wenzel VHF PLO Oscillators Off Frequency

[Mark Goldberg]

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 of the ones
>> I've bought on eBay have been from the customer-proprietary 500- series
>> with unusual input frequencies.
>>
>>
> I swept the input from 1 to 100 MHz. They lock at 38.4 MHz in. Yes they
> are 4-5 kHz off when free running. Locked they are right on frequency.
>
> Mark
>
>
I have one more question.  Does anyone know if when unlocked it is possible
to apply a tuning voltage to the Phase Lock Voltage monitor pin? What good
is it to have an OCXO that needs to lock to a external frequency and is 4
kHz off when unlocked? When locked, it comes up on frequency from first
power on, so why would an oven be needed at all?

If interested, take a look at my qrz.com page for links as to why I am
doing this. I have fallen down the rabbit hole of more accurate frequency!

Thanks,

Mark
W7MLG
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Re: [time-nuts] Wenzel VHF PLO Oscillators Off Frequency

[Mark Goldberg]

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
> with unusual input frequencies.
>
>
I swept the input from 1 to 100 MHz. They lock at 38.4 MHz in. Yes they are
4-5 kHz off when free running. Locked they are right on frequency.

They don't spec the phase noise when locked. I hope it is decent. The phase
noise when unlocked is pretty good. I can only measure the phase noise
indirectly by driving my Perseus clock with this and comparing phase noise
measurements when using the internal clock. I may wind up using the
internal clock when measuring phase noise and this when measuring Allan
Deviation.

Thanks for the suggestions.

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

[John Miles]

> 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 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.

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 with unusual input 
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.

Not offhand.  If there's a PFD inside it should be easy to zero in on the right 
frequency, but if there's only a phase detector you may need to set up a sweep 
and watch the tuning-voltage output on a scope.  I don't remember it taking 
very long to find the correct input frequencies for the ones I bought, though.  
 

-- john, KE5FX
Miles Design LLC

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

[Bob Camp]

Hi

If it is a OCVCXO and it pulls > 50 ppm at 80 MHz, it’s got terrible phase 
noise close in.
That’s true with or without the PLL engaged.

Bob


> On Nov 12, 2017, at 7:46 PM, Mark Goldberg <marklgoldb...@gmail.com> wrote:
> 
> 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
> above.
> 
> 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.
> 
> Thanks,
> 
> Mark
> 
> 
> On Sun, Nov 12, 2017 at 5:19 PM, John Miles <j...@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-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.
>>>> 
>> 
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Re: [time-nuts] Wenzel VHF PLO Oscillators Off Frequency

[Mark Goldberg]

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
above.

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.

Thanks,

Mark


On Sun, Nov 12, 2017 at 5:19 PM, John Miles <j...@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-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.
> > >
>
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Re: [time-nuts] Wenzel VHF PLO Oscillators Off Frequency

[John Miles]

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.
> >

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

[Bob Camp]

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  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.
> 
> Mark
> 
> On Sun, Nov 12, 2017 at 12:34 PM, Bob Camp  wrote:
> 
>> 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 80 MHz) is also a good indication that
>> the oven
>> is not doing it’s job correctly.
>> 
>> If multiple units do the same thing, either they all got busted being
>> puled from gear
>> (unfortunately that’s common) or you are running it at the wrong supply
>> voltage.
>> 
>> Bob
>> 
>> 
>> 
>>> On Nov 12, 2017, at 1:19 PM, Mark Goldberg 
>> wrote:
>>> 
>>> 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. If it has an unlocked PLL on the output, with no control, would it
>> go
>>> to the max frequency? Since the seller seems to be reasonable, I was
>> trying
>>> to figure out best not to waste both of our's time, and me get a good
>> unit
>>> and them getting a sale.
>>> 
>>> Mark
>>> 
>>> 
>>> On Sun, Nov 12, 2017 at 9:22 AM, Bob Camp  wrote:
>>> 
 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 on eBay show up with
 issues as a result. There is no way to be sure this or that part was
 ok before it came out of the gear it was in. It’s always a gamble.
 
 Bob
 
> On Nov 12, 2017, at 10:41 AM, Mark Goldberg 
 wrote:
> 
> I have obtained a couple 80 MHz Wenzel Oscillators P/N 500-16423A. They
 are
> proprietary but similar to the VHF PLO and 501-14057 Oscillators. I
>> want
 to
> use this to replace the internal oscillator in my Perseus SDR, for
>> better
> accuracy and maybe better phase noise. Both of these are way off in
> frequency, about 4-5 kHz high from the ideal 80 MHz, and drift around
> hundreds of Hz. I believe they are broken in some way. The PLL lock
 signal
> toggles when I put an input into the 10 MHz reference, but the output
> frequency is not affected.
> 
> Wenzel has answered some of my questions, but can't get specific as
>> these
> are proprietary to a customer.
> 
> Any experts on these oscillators out there?
> 
> Thanks,
> 
> Mark
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>>> ___
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To 

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

[Mark Goldberg]

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.

Mark

On Sun, Nov 12, 2017 at 12:34 PM, Bob Camp  wrote:

> 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 80 MHz) is also a good indication that
> the oven
> is not doing it’s job correctly.
>
> If multiple units do the same thing, either they all got busted being
> puled from gear
> (unfortunately that’s common) or you are running it at the wrong supply
> voltage.
>
> Bob
>
>
>
> > On Nov 12, 2017, at 1:19 PM, Mark Goldberg 
> wrote:
> >
> > 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. If it has an unlocked PLL on the output, with no control, would it
> go
> > to the max frequency? Since the seller seems to be reasonable, I was
> trying
> > to figure out best not to waste both of our's time, and me get a good
> unit
> > and them getting a sale.
> >
> > Mark
> >
> >
> > On Sun, Nov 12, 2017 at 9:22 AM, Bob Camp  wrote:
> >
> >> 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 on eBay show up with
> >> issues as a result. There is no way to be sure this or that part was
> >> ok before it came out of the gear it was in. It’s always a gamble.
> >>
> >> Bob
> >>
> >>> On Nov 12, 2017, at 10:41 AM, Mark Goldberg 
> >> wrote:
> >>>
> >>> I have obtained a couple 80 MHz Wenzel Oscillators P/N 500-16423A. They
> >> are
> >>> proprietary but similar to the VHF PLO and 501-14057 Oscillators. I
> want
> >> to
> >>> use this to replace the internal oscillator in my Perseus SDR, for
> better
> >>> accuracy and maybe better phase noise. Both of these are way off in
> >>> frequency, about 4-5 kHz high from the ideal 80 MHz, and drift around
> >>> hundreds of Hz. I believe they are broken in some way. The PLL lock
> >> signal
> >>> toggles when I put an input into the 10 MHz reference, but the output
> >>> frequency is not affected.
> >>>
> >>> Wenzel has answered some of my questions, but can't get specific as
> these
> >>> are proprietary to a customer.
> >>>
> >>> Any experts on these oscillators out there?
> >>>
> >>> Thanks,
> >>>
> >>> Mark
> >>> ___
> >>> 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.
> >>
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> >> mailman/listinfo/time-nuts
> >> and follow the instructions there.
> >>
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Re: [time-nuts] Wenzel VHF PLO Oscillators Off Frequency

[Bob Camp]

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 80 MHz) is also a good indication that the 
oven 
is not doing it’s job correctly. 

If multiple units do the same thing, either they all got busted being puled 
from gear 
(unfortunately that’s common) or you are running it at the wrong supply 
voltage. 

Bob



> On Nov 12, 2017, at 1:19 PM, Mark Goldberg  wrote:
> 
> 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. If it has an unlocked PLL on the output, with no control, would it go
> to the max frequency? Since the seller seems to be reasonable, I was trying
> to figure out best not to waste both of our's time, and me get a good unit
> and them getting a sale.
> 
> Mark
> 
> 
> On Sun, Nov 12, 2017 at 9:22 AM, Bob Camp  wrote:
> 
>> 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 on eBay show up with
>> issues as a result. There is no way to be sure this or that part was
>> ok before it came out of the gear it was in. It’s always a gamble.
>> 
>> Bob
>> 
>>> On Nov 12, 2017, at 10:41 AM, Mark Goldberg 
>> wrote:
>>> 
>>> I have obtained a couple 80 MHz Wenzel Oscillators P/N 500-16423A. They
>> are
>>> proprietary but similar to the VHF PLO and 501-14057 Oscillators. I want
>> to
>>> use this to replace the internal oscillator in my Perseus SDR, for better
>>> accuracy and maybe better phase noise. Both of these are way off in
>>> frequency, about 4-5 kHz high from the ideal 80 MHz, and drift around
>>> hundreds of Hz. I believe they are broken in some way. The PLL lock
>> signal
>>> toggles when I put an input into the 10 MHz reference, but the output
>>> frequency is not affected.
>>> 
>>> Wenzel has answered some of my questions, but can't get specific as these
>>> are proprietary to a customer.
>>> 
>>> Any experts on these oscillators out there?
>>> 
>>> Thanks,
>>> 
>>> Mark
>>> ___
>>> 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.
>> 
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>> 
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Re: [time-nuts] Wenzel VHF PLO Oscillators Off Frequency

[Mark Goldberg]

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. If it has an unlocked PLL on the output, with no control, would it go
to the max frequency? Since the seller seems to be reasonable, I was trying
to figure out best not to waste both of our's time, and me get a good unit
and them getting a sale.

Mark


On Sun, Nov 12, 2017 at 9:22 AM, Bob Camp  wrote:

> 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 on eBay show up with
> issues as a result. There is no way to be sure this or that part was
> ok before it came out of the gear it was in. It’s always a gamble.
>
> Bob
>
> > On Nov 12, 2017, at 10:41 AM, Mark Goldberg 
> wrote:
> >
> > I have obtained a couple 80 MHz Wenzel Oscillators P/N 500-16423A. They
> are
> > proprietary but similar to the VHF PLO and 501-14057 Oscillators. I want
> to
> > use this to replace the internal oscillator in my Perseus SDR, for better
> > accuracy and maybe better phase noise. Both of these are way off in
> > frequency, about 4-5 kHz high from the ideal 80 MHz, and drift around
> > hundreds of Hz. I believe they are broken in some way. The PLL lock
> signal
> > toggles when I put an input into the 10 MHz reference, but the output
> > frequency is not affected.
> >
> > Wenzel has answered some of my questions, but can't get specific as these
> > are proprietary to a customer.
> >
> > Any experts on these oscillators out there?
> >
> > Thanks,
> >
> > Mark
> > ___
> > 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.
>
> ___
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Re: [time-nuts] Wenzel VHF PLO Oscillators Off Frequency

[Bob Camp]

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 on eBay show up with 
issues as a result. There is no way to be sure this or that part was
ok before it came out of the gear it was in. It’s always a gamble.

Bob

> On Nov 12, 2017, at 10:41 AM, Mark Goldberg  wrote:
> 
> I have obtained a couple 80 MHz Wenzel Oscillators P/N 500-16423A. They are
> proprietary but similar to the VHF PLO and 501-14057 Oscillators. I want to
> use this to replace the internal oscillator in my Perseus SDR, for better
> accuracy and maybe better phase noise. Both of these are way off in
> frequency, about 4-5 kHz high from the ideal 80 MHz, and drift around
> hundreds of Hz. I believe they are broken in some way. The PLL lock signal
> toggles when I put an input into the 10 MHz reference, but the output
> frequency is not affected.
> 
> Wenzel has answered some of my questions, but can't get specific as these
> are proprietary to a customer.
> 
> Any experts on these oscillators out there?
> 
> Thanks,
> 
> Mark
> ___
> 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.

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[time-nuts] Wenzel VHF PLO Oscillators Off Frequency

[Mark Goldberg]

I have obtained a couple 80 MHz Wenzel Oscillators P/N 500-16423A. They are
proprietary but similar to the VHF PLO and 501-14057 Oscillators. I want to
use this to replace the internal oscillator in my Perseus SDR, for better
accuracy and maybe better phase noise. Both of these are way off in
frequency, about 4-5 kHz high from the ideal 80 MHz, and drift around
hundreds of Hz. I believe they are broken in some way. The PLL lock signal
toggles when I put an input into the 10 MHz reference, but the output
frequency is not affected.

Wenzel has answered some of my questions, but can't get specific as these
are proprietary to a customer.

Any experts on these oscillators out there?

Thanks,

Mark
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