[time-nuts] Lucent RFTGm-II-XO / Lucent RFTGm-II-Rb / NT BW50AA

[Bob kb8tq]

Hi

Pretty much all of these big old telecom beasts are “good enough” for “typical use”. The gotcha
is that both of those terms are very much lacking in precision. Since this is a precision sort of
thing, that may not be ideal :)

If 0.1 ppb is good enough for what you are doing, then they all should be fine. If you need 0.001 ppb, 
then none of them are likely to do what you need to do. Between those two limits, things like antennas,
survey locations, lab temperature, and the accuracy definition you use all get into play. Yes, you *can*
have some unusual cases (your lab goes from -20 to +90 (F of course …) on a daily basis. For anything
reasonable, the limits above are pretty good. 

If time rather than frequency *is* the goal, then one of these GPSDO's is not really what you want. 
The time pulse output from a good GPS module is likely closer to UTC (after some math) than the 
output of the GPSDO.

Bob

> On Feb 11, 2019, at 9:57 PM, Jeff Blaine <KeepWalking188 at ac0c.com> wrote:
> 
> I have these 3 systems operational here and wonder what is the "best" of the sources?
> 
> The local use for the reference is as a time base for test equipment.  Nothing hyper critical in the way of end-use requirements - but after running the NT GPSDO for a few years and watching the Lucent box collect dust, I wonder if I have got that backward?
> 
> The lucent has a 10 Mhz output on the front panel of the RB but the XO would need a tiny bit of modification to have 10 Mhz instead of the current 15 Mhz.
> 
> There is a lot of data on http://leapsecond.com/u/sims/gpsdo17/ but I don't see the RFTG XO on there - which I assume is due to it's native 15 Mhz Fo vs. 10 Mhz for the rest of the field.
> 
> Appreciate any advice you may have for a (very) novice 'nut.
> 
> 73/jeff/ac0c
> alpha-charlie-zero-charlie
> www.ac0c.com
> 
> 
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