Regarding "as good a place to start as any", ublox receivers will do
10KHz all day long.
I didn't realize ublox receivers have dual output until after I built
a couple of other GPSDOs, (well, maybe four)
As for a good OCXO: other than the Morion MV89a, ($20-$50) for
anything else, figure about one or two hundred bucks depending on new
vs used and "luck".
But as it's been said before it all depends on if you are building
"to use" or "to play/learn/experiment/get your hands dirty"
Building does not save money or time and buying doen't give you an
excuse to fire up the soldering iron.
Decisions...decisions...
Dimitri.p
At 12:00 PM 4/4/2016, Chris Caudle wrote:
On Mon, April 4, 2016 11:18 am, Tom Holmes wrote:
> The preceding questions always come up when a newbie
> comes up on the list wanting to build their own GPSDO.
It is good to make sure the person actually wants to build a GPSDO.
A few years back I was in a similar position, and my answer was I actually
needed a high accuracy reference to check frequency accuracy of some
clocks, and the recommendation was just get a Thunderbolt. I didn't know
about surplus GPSDO's available so that was good advice for me, I didn't
actually >want< to build a GPSDO myself. It would have been fun, but the
end goal was more important to me.
So I think really the first question should be do you want to build a
GPSDO, or do you want a high accuracy time and frequency source for its
own use? Because if you want to own a GPSDO to use, building one yourself
is probably not the way to go. Get a surplus unit, or save up a little
more and get a new Jackson Labs.
If you just like to build stuff and a GPSDO is the particular stuff you
want to build next, then go ahead and have fun. Chris Albertson's arduino
based design is probably as good a place to start as any, it should be
cheap and I think the pieces are easier to find than that CPLD based
design that relies on having a GPS that can output 10kHz instead of just
PPS.
--
Chris Caudle
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