[time-nuts] Wenzel VHF PLO Oscillators Off Frequency

Bob Camp kb8tq at n1k.org
Mon Nov 13 12:13:34 EST 2017


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 <marklgoldberg at gmail.com> wrote:
> 
> On Sun, Nov 12, 2017 at 7:02 PM, Mark Goldberg <marklgoldberg at gmail.com>
> wrote:
> 
>> 
>> On Sun, Nov 12, 2017 at 6:38 PM, John Miles <john at miles.io> 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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