I have a 58503 that occasionally is not able to track satellites. Usually I wait until the holdover expires but then the only fix seems to restart the 58503 (SYST:PRESET) better than power cycle. It seems there is a command to reset only the GPS receiver but it is not in the 58503 manual.
On Tue, Jul 16, 2013 at 6:33 AM, Mark C. Stephens <ma...@non-stop.com.au> wrote: > I have a Z3816A and it periodically jumps into holdover with error message: > Holdover: 1PPS TI exceeds hold threshold > Then for the next 3-4 hours it gradually adjusts the phase alignment. > The error message is Recovery: phase alignment [TI +435.5 us] > (when I noticed it had changed, they figure was likely to have been much > higher) > The TI then gradually decreases, currently it is sitting on: > Recovery: phase alignment [TI +129.9 us] > > I am hoping that I won't have to power cycle the GPSDO to get it locked again. > > I emailed the seller (Yixun HK) and they are trying to tell me power cycle is > only fix. > They also claim the cause is due to weather? > > I explained to Yixun I have a lot of smart clocks here and none have > exhibited the same problem ever. > This is the 3rd defective Z3816A I have got off Yixun and it is costing me a > small fortune to send these back. > The first was reporting the 12v Supply was out of tolerance, a quick jump > into pForth confirmed the A, B and C 12v supplies were over 12.5v. > I ended up sending it back to Yixun. > The second I was able to fix myself, apparently someone had changed the OCXO > but left the insulating-spacing washers out from the pins of the OCXO. > This was causing a short on the EFC. > That Z3816A unit and now appears to be running normally except the PU is > terrible, I'll run Cal for 24 hours and see if it improves. > > However, Now the 3rd unit is getting this TI exceeded error. > I think I have had enough of shipping things back to these guys - they won't > replace anything, including parts, unless you ship back to them first. > > > I would just like to get some informed opinions, could the issue be with: > > a) Antenna > > b) GPS Module > > c) OCXO > > d) PLL circuit on main board. > > Many thanks, > --marki > _______________________________________________ > 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. _______________________________________________ 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.
