I've actually done this... Lady Heather has built in "alternate disciplining" algorithm for the Thunderbolt. I tricked up some code to use this along with a TAPR-TICC to make a GPSDO. The first (rather crude) hack worked pretty well. I haven't had a chance to do it properly... yet. The idea was to allow the 5071A to run with the CBT in standby for applications that do not require the cesium goodness. ------------- > A fun (and actually very useful) project would be to turn it into a GPSDO

On Thursday, December 19, 2019, 5:34:55 PM EST, Mark Sims <holrum@hotmail.com> wrote:  

My experiment is not going well so far.  I have NOT done any tuning.  Just connected 1 pps out from GPS to 1 pps IN on 5071A.  Frequency keeps increasing, which I think is weird.  I thought it might just be unstable without proper parameters, but no.  Over last 24 hours, it kept going up.  I was about to start reading the 5071A manual.  Likely as TVB says, it will likely be needing quite a bit of refining loop parameters.  One unknown is, in this current state (fault), if OCXO is even steerable.  1 pps WAS detected and menu option did tell me so.  I didn't know you can put 5071A in (Cs tube only) STAND-BY mode...  Mine is dead so it's in permanent stand-by.  It's initial boot sequence detects this and shuts it down.  On a slightly different topic, my PRS10 + GPS experiment is working rather well.  I haven't done any tuning and using default for everything.  I'm going to wait about a month before doing so.  Loop constant is 1 day, so it may take quite some time to completely stabilize. --------------------------------------- (Mr.) Taka Kamiya KB4EMF / ex JF2DKG On Thursday, December 19, 2019, 5:34:55 PM EST, Mark Sims <holrum@hotmail.com> wrote: I've actually done this...  Lady Heather has built in "alternate disciplining" algorithm for the Thunderbolt.  I tricked up some code to use this along with a TAPR-TICC to make a GPSDO.  The first (rather crude) hack worked pretty well.  I haven't had a chance to do it properly... yet. The idea was to allow the 5071A to run with the CBT in standby for applications that do not require the cesium goodness. ------------- > A fun (and actually very useful) project would be to turn it into a GPSDO _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.

On Thursday, December 19, 2019, 5:34:55 PM EST, Mark Sims <holrum@hotmail.com> wrote:  

Hi The PPS input on the 5071 does *not* set the frequency of the device. To do so would “break” the Cs ( = you use the beam to get frequency). The *only* thing the PPS input gets used for is to reset the *time* to sync with UTC. Bob > On Dec 19, 2019, at 5:56 PM, Taka Kamiya via time-nuts <time-nuts@lists.febo.com> wrote: > > My experiment is not going well so far. I have NOT done any tuning. Just connected 1 pps out from GPS to 1 pps IN on 5071A. Frequency keeps increasing, which I think is weird. I thought it might just be unstable without proper parameters, but no. Over last 24 hours, it kept going up. I was about to start reading the 5071A manual. Likely as TVB says, it will likely be needing quite a bit of refining loop parameters. One unknown is, in this current state (fault), if OCXO is even steerable. 1 pps WAS detected and menu option did tell me so. > > I didn't know you can put 5071A in (Cs tube only) STAND-BY mode... Mine is dead so it's in permanent stand-by. It's initial boot sequence detects this and shuts it down. > > On a slightly different topic, my PRS10 + GPS experiment is working rather well. I haven't done any tuning and using default for everything. I'm going to wait about a month before doing so. Loop constant is 1 day, so it may take quite some time to completely stabilize. > --------------------------------------- > (Mr.) Taka Kamiya > KB4EMF / ex JF2DKG > > > On Thursday, December 19, 2019, 5:34:55 PM EST, Mark Sims <holrum@hotmail.com> wrote: > > I've actually done this... Lady Heather has built in "alternate disciplining" algorithm for the Thunderbolt. I tricked up some code to use this along with a TAPR-TICC to make a GPSDO. The first (rather crude) hack worked pretty well. I haven't had a chance to do it properly... yet. > > The idea was to allow the 5071A to run with the CBT in standby for applications that do not require the cesium goodness. > > ------------- > >> A fun (and actually very useful) project would be to turn it into a > GPSDO > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there.