[time-nuts] Why is holdover LED on HP 58503A not lit, when GPS lock is unlit too?

Dr. David Kirkby (Kirkby Microwave Ltd) drkirkby at kirkbymicrowave.co.uk
Mon Dec 19 23:15:50 UTC 2016


On 18 December 2016 at 22:41, Dr. David Kirkby (Kirkby Microwave Ltd) <
drkirkby at kirkbymicrowave.co.uk> wrote:

> It is looking much better now. I
>
> 1) Powered off
> 2) Left off for 30 s
> 3) Pulled antenna out.
> 4) Powered on
> 5) Connected antenna, making sure if was firmly screwed in.
>
> It then got GPS lock in a few minutes. It is running at reduced accuracy,
> with the survey only 9.7% complete, but it is looking more hopeful.
>

This does appear now to be working - see below. I'm not exactly sure what
was the secret to getting this to work, but the above procedure seemed ok.


scpi >  SYSTEM:STATUS?
------------------------------- Receiver Status
-------------------------------

SYNCHRONIZATION ............................................. [ Outputs
Valid ]
SmartClock Mode ___________________________   Reference Outputs
_______________
>> Locked to GPS                              TFOM     3
FFOM     0
   Recovery                                   1PPS TI -8.3 ns relative to
GPS
   Holdover                                   HOLD THR 1.000 us
   Power-up                                   Holdover Uncertainty
____________
                                              Predict  9.6 us/initial 24 hrs

ACQUISITION ................................................ [ GPS 1PPS
Valid ]
Tracking: 6 ____   Not Tracking: 2 ________   Time _____ +1 leap second
pending
PRN  El  Az   SS   PRN  El  Az                UTC      23:11:07     19 Dec
2016
  2  31  69   83     6  15  34                GPS 1PPS Synchronized to UTC
 12  41  80  110    32  27 234                ANT DLY  0 ns
 14  37 266   81                              Position
________________________
 25  83  33  127                              MODE     Hold
 29  55 195  135
 31  42 301   75                              LAT      N  51:39:04.198
                                              LON      E   0:46:36.358
ELEV MASK 10 deg                              HGT               +45.42 m
(MSL)
HEALTH MONITOR ......................................................... [
OK ]
Self Test: OK    Int Pwr: OK   Oven Pwr: OK   OCXO: OK   EFC: OK   GPS Rcv:
OK
scpi >



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