[Elecraft] GPS Disciplined 10MHZ source from China

[Harry Yingst]

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 <jayfmiller at mindspring.com>
To: elecraft at 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