Roy,
In the early days of time-nuts and eBay the URQ-10A (made by FEI) was
highly sought after due to its reputation for superb stability. There's
also the -23A which is similar but has a frequency drift compensation
feature.
With any old piece of gear it's hard to know if a specific unit for sale
is bad, good, or superb so YMMV.
See fellow time nut Brooke's page with photos:
https://www.prc68.com/I/URQ10-URQ23.shtml
Is your -10A manual hard-copy or PDF? If the latter, consider adding it
to fellow time nut Didier's page:
http://www.ko4bb.com/getsimple/index.php?id=manuals
I don't have any suggestions about fixing the ~10 Hz offset. It's either
aged very far over the decades or perhaps there's just an oven problem.
You can do some simple non-destructive experiments to determine which.
Note that some people would pay a lot for a ultra high stability
oscillator with a 5 MHz + 10 Hz offset: it could make a wonderful beat
note reference for a mixer-based frequency stability analyzer.
/tvb
On 7/17/2019 3:07 PM, Roy Thistle 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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