[time-nuts] Least costly 10 MHz reference solution

[Bob Camp]

Hi

Not to pick nits, but 7 decimal places at what input frequency? Seven places
is 10 ppb at 10 MHz. If the input was 100 MHz, it would be 1 ppb. 

The distinction is significant, since it crosses a boundary.  At 10 ppb a
free running Rb is fine with no adjustments. At 1 ppb, some adjustment might
be needed. 

You might also want a standard that's 5X better than the expected result.
That would get you into the 2 to 0.2 ppb range.

Lots of fiddly little details...

Bob

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Russ Ramirez
Sent: Wednesday, January 23, 2013 11:48 AM
To: time-nuts at febo.com
Subject: [time-nuts] Least costly 10 MHz reference solution

Greetings,

I have been reading what I can find on Rubidium and GPSDO approaches, but
there are some fine points that do not make it clear which is the best
'bang for the buck' solution. My requirement/desire is to have a 10 MHz
standard for my lab that I can trust to an accuracy of 7 decimal places (10
ppb?), so anything that is good to a few ppb is certainly adequate for what
I am looking for. I have a OCXO unit that is voltage adjustable - for
example, adjusting this to 10.0000000 MHz per my HP 5334A requires -12.71V.

So the simple (maybe) question is, should I go for a Rubidium disciplined
unit, or go with a home-brew GPSDO solution using the Vectron OCXO I
already have? My main cause of confusion is ignorance concerning all the
GPS solutions out there with 1pps outputs, to use in a GPSDO, and which
ones jitter too much to be useful (solutions under $50 exist).

Thanks in advance.

Russ
K0WFS
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