[time-nuts] AN/URQ-10A

[Bob kb8tq]

Hi

Positive aging on a crystal is not at all unusual. If your device dates to the 1970’s, 
it’s had a *lot* of time to age. Aging up a couple ppm over 40 years is not at all 
unusual ….

There are a variety of methods out there to double the frequency. The diode “rectifier”
doublers are generally the most stable approach. The thing to avoid is a lot of bandpass 
filters. They will be temperature sensitive and “modulate” the output as temperature changes.

Bob

> On Jul 17, 2019, at 6:07 PM, Roy Thistle <roy.thistle at mail.utoronto.ca> wrote:
> 
> Hi All:
> 
> I tried to search for this, in the forum, but, I didn't find much.
> 
> I'm interested in getting a AN/URQ-10A... I have the manual. It's an old on ship, frequency standard.
> 
> Does anyone have recommendations, or issues, concerning these units?
> 
> The one I am thinking of is a little bit high (about +10 Hz, I think) and can't be "tuned" back to 5 MHz, without... I am guessing calibration. But, I am wondering if... because of the positive drift, if the crystal is damaged.
> 
> By the way, how and why 5MHz... because its not that useful! … at least today.
> 
> Does a frequency doubler… assuming a lock on the standard... cause errors in the 10 MHz signal obtained?
> 
> Best regards and wishes
> 
> Roy
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