[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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