[time-nuts] A new take on the all-hardware GPSDO concept
nsayer at kfu.com
Tue Sep 27 00:24:42 EDT 2016
> On Sep 16, 2016, at 1:13 PM, Lars Walenius <lars.walenius at hotmail.com> wrote:
> My experience with the Venus838-T is only 2 weeks but disappointing. This can also be guessed from the datasheet ADEV curve, that I guess is sawtooth corrected values as it starts at 3E-9 at 1s, but is only 1E-11 at 1000s a factor 10 worse than I get with the LEA-6T with the same antenna and setup. If anyone have ADEV-MDEV curves to share I would be glad to see what can be achieved with the venus838-T. My conclusion is also that sawtooth correction is useless on my 838-T.
Are you talking about the PPS output or the frequency output (10 MHz by default)?
I haven’t attempted to get ADEV plots of the PPS output mainly because I’m not sure the best experimental setup.
I could (try to) capture time differences between the PPS output of a thunderbolt and the PPS output of the Venus, but would taking the ADEV of that give correct results?
>> Nick wrote:
>> Jim Miller's 10 kHz GPSDO that’s been referenced here has either solved this problem, or the 10 kHz output of the >Jupiter is substantially better than the Venus’ 10 MHz output, or the design doesn’t give the results time-nuts expect >from a GPSDO. Which of those applies?
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