[MRCA] GPS disciplined oscillators

Nick England navy.radio at gmail.com
Tue Oct 4 16:39:49 EDT 2022


I was surprised a few years ago when I calibrated a URQ-10 double-ovened
crystal freq standard against WWV and then checked it against my HP and GR
freq counters. They were a bit off so I decided to calibrate them. To my
surprise I found that their crystals were just sitting out in free air. But
hey, they had digits reading down to 0.1 Hz so they *looked* really
accurate.

I need to revisit this issue some day and get everything slaved to the
URQ-10. The proper procedure for calibrating it involves a chart recorder
so you get the beat against WWV down to less than one cycle per week….

Too many interesting projects!
Nick K4NYW

On Tue, Oct 4, 2022 at 3:16 PM Ray Fantini <RAFANTINI at salisbury.edu> wrote:

> Lot to be said for having everything run in the background from an
> external reference of known accuracy. Been doing manual calibration with
> the WWV thing for years but these days people expect crazy degrees of
> accuracy. Along with things like being able to look at a display and not
> have to do any thinking.
>
> For $200 I will be getting something that’s will keep everything accurate
> well below the resolution of my equipment and when I have people in the
> shop wont have to put up with stupid “ this is my new BoFang that I paid
> $35 for and its got to be more accurate then your old stuff” statements.
>
>
>
> Ray F/KA3EKH
>
>
> --
Nick England K4NYW
www.navy-radio.com
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