Mine is from G3RUH http://www.jrmiller.demon.co.uk/projects/ministd/frqstd.htm
he states: The stability as given by the Allan Deviation is typically 5x10-12
at τ=10s.
That figure is 0.05 Hz at 10 GHz and is a remarkably small value.
Using mine as a example I would say the one you have is way off.
I'm not sure what you are using for an Antenna, I'm using an external GPS
Timing Antenna
________________________________
From: Jay Miller <jayfmil...@mindspring.com>
To: elecraft@mailman.qth.net
Sent: Monday, May 8, 2017 6:28 PM
Subject: [Elecraft] GPS Disciplined 10MHZ source from China
I was curious so I bought a GPS disciplined 10MHz source from China using
the eBay seller "cybereveryday." I have a calibrated scope and a Rubidium
10MHz source. I noticed a frequency offset on three of the WWV frequencies
when I plugged it into the K3 XREF module after getting "GPS Lock" rather
than using my Rubidium lamp standard I measured the 10MHz output from the
GPSDO and it is 10,000,025 Hz. (2.5 PPM) The eBay ad states "Accuracy: than
above OXCO 2 order of magnitude." The point is, even using the K3 zero-beat
method with 15 MHz WWV I can get closer to being dead on frequency than
using this Chinese mfg. GPSDO. Again, Elecraft quality and engineering WINS.
Jay Miller, N4NUI
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