[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 17:14:29 EST 2016
On 18 December 2016 at 18:19, Dan Rae <danrae at verizon.net> wrote:
> On 12/18/2016 9:34 AM, Dr. David Kirkby (Kirkby Microwave Ltd) wrote:
>
>> ________________________
>> *12 -- --- MODE Survey: 0%
>> complete
>>
>>
> If it's still showing that after being on for five hours, maybe it needs
> to be explicitly told to start a survey?
>
> dr
>
I seem to be having some issues now with this. I've reset it, and entered
the approximate latitude, longitude, height, as well as date and time. The
commands below were executed, although NOT necessarily in the order give.
E-113> GPS:INIT:DATe 2016,12,18
E-113> gps:init:time 19,18,35
E-113> SYSTEM:PRESET
scpi > DIAG:LOG:READ:ALL?
Log status: 2 entries
Log 001:19970504.00:00:00: Log cleared
Log 002:19970504.00:00:00: System preset
The receiver seems to find satellites fairly quickly, tries to track them,
and is showing reasonable values for the things I set, like date, time,
position etc. However, the receiver doesn't seem able to track any
satellites, so not surprisingly the survey never starts. I assume it wont
start until it has tracked sufficient number of satellites.
scpi > SYSTEM:STATUS?
------------------------------- Receiver Status
-------------------------------
SYNCHRONIZATION ........................................... [ Outputs
Invalid ]
SmartClock Mode ___________________________ Reference Outputs
_______________
Locked TFOM 9
FFOM 3
Recovery 1PPS TI --
Holdover HOLD THR 1.000 us
>> Power-up: GPS acquisition Holdover Uncertainty
____________
Predict --
ACQUISITION .............................................. [ GPS 1PPS
Invalid ]
Tracking: 0 ____ Not Tracking: 12 _______ Time
____________________________
PRN El Az PRN El Az UTC 21:57:41 [?] 18 Dec
2016
6 20 67 12 76 56 GPS 1PPS Invalid: not tracking
* 7 -- --- 14 32 307 ANT DLY 0 ns
* 8 -- --- 24 42 129 Position
________________________
* 9 -- --- 25 58 259 MODE Survey: 0%
complete
*10 -- --- *31 10 299 Suspended: track <4
sats
*11 -- --- 32 45 274 INIT LAT N 51:39:03.825
INIT LON E 0:46:36.277
ELEV MASK 10 deg *attempting to track INIT HGT +29.99 m
(MSL)
HEALTH MONITOR ......................................................... [
OK ]
Self Test: OK Int Pwr: OK Oven Pwr: OK OCXO: OK EFC: OK GPS Rcv:
OK
It will run overnight. Perhaps tomorrow it will sort itself out, but I'm
not too hopeful.
Dr. David Kirkby Ph.D CEng MIET
Kirkby Microwave Ltd
Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, Essex, CM3 6DT,
UK.
Registered in England and Wales, company number 08914892.
http://www.kirkbymicrowave.co.uk/
Tel: 07910 441670 / +44 7910 441670 (0900 to 2100 GMT only please)
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