I tried to see the 1PPS on my oscilloscope. Here is the series of
screenshots from that experiment:
https://www.patoka.ca/OCXO/TBvsSL/
I also tried to catch something using HP5386A. However I was not able to
measure the pulse.
Regards,
Vlad
On 2016-03-29 18:53, Henry Hallam wrote:
If you put the PPS outputs of the two GPSDOs into an oscilloscope and
trigger on the leading edge of one of them, what does the other look
like?
Henry
On Tue, Mar 29, 2016 at 12:56 PM, Vlad <t...@patoka.org> wrote:
Hello,
I am looking for for the advise regarding some strange difference in
frequency between of two GPSDO: Trimble Thunderbolt and Datum Starloc
II
Measuring by HP 5386A counter it shows something around 0.0000014
delta.
If I connect TB as REF source then I am getting numbers like this:
10.000001396 Mhz
If I connect StarLoc II as REF source then I am getting following:
9.999998612 Mhz
May be somebody could recognize, what 10.0000014 Mhz could be used for
?
TB Lady Heather screenshot
http://www.patoka.org/OCXO/TB-LH-Mar.png
Allan Deviation for several hours looks like this:
http://www.patoka.org/OCXO/TB-SL.png
I connected both GPSDO to Rigol DS1102E Oscilloscope to see the phase
difference. And its shows me the ellipse which change its orientation
left
to right and vice versa.
Its classical case of Segal's law: "A man with a watch knows what time
it
is. A man with two watches is never sure". This is exact situation.
Now I am
not sure which GPSDO (if any) is more accurate.
I have no third GPSDO (or equivalent) to compare. TB and Starloc
connected
to the same GPS Antenna distribution amplifier. So basically both
using the
same antenna. Both of them was turned on at relatively the same time
and
both was warmed up for few days.
I have a theory, that may be StarLoc II was customized somehow to
produce
the freq. slightly different from 10Mhz. But its just a theory.
Is it worth to compare 1PPS outputs using something like AD8302 + DAC
+ MCU
?
--
WBW,
V.P.
_______________________________________________
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
--
WBW,
V.P.
_______________________________________________
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
