[time-nuts] Using HP5071A with dead tube along with GPS

[Taka Kamiya]

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 at 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 at lists.febo.com
To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
and follow the instructions there.