For evaluation I purchased last spring directly from China one of the
BG7TBL 10 mhz sine output GPS Defined Oscillators when the price was
$125. These very nice units are now being sold from CA for a bit more
and comes with everything needed, Unit, GPS antenna, power supply.
http://www.ebay.com/itm/10MHZ-Output-Sine-Wave-GPS-Disciplined-Clock-GPSDO-GPS-Antenna-Power-Supply-US-/261977676713?hash=item3cff161ba9:g:ZJQAAOSwrklVf3wV
It uses the Russian Morion Double oven crystal oscillators controlled by
voltage feedback against the GPS1 pulse per second signal using a very
long time constant control loop. If you would like a block drawing
contact me directly.
I gave the unit to KE5FX, a member of the "Time Nuts" group, who has the
equipment to evaluate it. His results are posted at
http://www.ke5fx.com/gpscomp.htm It was found due to the pulse width
method of creating the Morion oscillator control voltage this unit was
operating 2 to 3 times ten to the minus 11 cycles low. I wouldn't get
too upset at this as that error would only be 3 hz off at 100 GHZ.
Found the unit works great as a master reference for not only the K3 but
lab gear like counters and signal generators.
73 Bob W7AVK
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