[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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