[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
Sun Dec 18 17:41:38 EST 2016


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.

I can't help feeling there should have been more informative status
available by the LEDs. The fact it is locked, but at reduced accuracy,
should really be visable from the front panel IMHO. Anyway, it seems to be
getting there - see below.

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

SYNCHRONIZATION ............................ [ Outputs Valid/Reduced
Accuracy ]
SmartClock Mode ___________________________   Reference Outputs
_______________
>> Locked to GPS: stabilizing frequency       TFOM     3
FFOM     1
   Recovery                                   1PPS TI -15.9 ns relative to
GPS
   Holdover                                   HOLD THR 1.000 us
   Power-up                                   Holdover Uncertainty
____________
                                              Predict  432.0 us/initial 24
hrs

ACQUISITION ................................................ [ GPS 1PPS
Valid ]
Tracking: 6 ____   Not Tracking: 3 ________   Time _____ +1 leap second
pending
PRN  El  Az   SS   PRN  El  Az                UTC      22:39:23     18 Dec
2016
  2  28  87   86     6  20  48                GPS 1PPS Synchronized to UTC
 12  57  70  119    24  24 137                ANT DLY  0 ns
 14  39 287  106    31  27 303                Position
________________________
 25  76 284   96                              MODE     Survey:    9.7%
complete
 29  37 194   79
 32  39 249  109                              AVG LAT  N  51:39:04.205
                                              AVG LON  E   0:46:36.347
ELEV MASK 10 deg                              AVG HGT           +42.42 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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