[time-nuts] HP 58503A GPS receiver not locking to GPS
Dr. David Kirkby
drkirkby at kirkbymicrowave.co.uk
Thu Aug 13 20:07:20 UTC 2020
Some time ago my GPS receiver would not lock to GPS. I put this down to the
fact the antenna had got tilted over quite a bit, and since I was not
needing the receiver, it got switched off, and I forgot about it for some
time.
I've since straightened the antenna up, and push it a little higher - it is
now about 3 m above ground
However, the unit will not lock, despite being on for a couple of days. The
status shows "attempting to lock", but does not actually lock one
satellite. I set the and time manually, as well as latitude, longitude, and
antenna height. I've also set the elevation mask to 10 degrees.
The data below shows some results of :system:status? over a period of a
little over two hours. I've run self-tests, and they all pass okay. The
occasional error below, such as E-113, it just where I have mis-typed
something. If I type *CLS, the display shows scpi>
I'm a bit concerned if the mode of "hold" is correct, but I'm unsure.
Has anyone got any suggestions as to what I can do to get it to lock?
scpi > :system:sy
E-113> :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 17:53:34 [?] 13 Aug
2020
* 1 -- --- 7 39 159 GPS 1PPS Invalid: not tracking
2 46 286 * 8 -- --- ANT DLY 0 ns
* 3 -- --- 9 77 72 Position
________________________
4 37 64 *10 -- --- MODE Hold
5 17 292 *11 -- ---
6 54 214 *30 15 182 LAT N 51:39:04.128
LON E 0:46:36.375
ELEV MASK 10 deg *attempting to track HGT +46.29 m
(MSL)
HEALTH MONITOR ......................................................... [
OK ]
Self Test: OK Int Pwr: OK Oven Pwr: OK OCXO: OK EFC: OK GPS Rcv:
OK
E-113> *CLS
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 17:54:01 [?] 13 Aug
2020
* 1 -- --- 7 39 159 GPS 1PPS Invalid: not tracking
2 46 286 * 8 -- --- ANT DLY 0 ns
* 3 -- --- 9 76 72 Position
________________________
4 37 64 *10 -- --- MODE Hold
5 18 292 *11 -- ---
6 54 214 *30 15 182 LAT N 51:39:04.128
LON E 0:46:36.375
ELEV MASK 10 deg *attempting to track HGT +46.29 m
(MSL)
HEALTH MONITOR ......................................................... [
OK ]
Self Test: OK Int Pwr: OK Oven Pwr: OK OCXO: OK EFC: OK GPS Rcv:
OK
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 18:00:50 [?] 13 Aug
2020
2 47 282 *11 -- --- GPS 1PPS Invalid: not tracking
4 34 64 *12 -- --- ANT DLY 0 ns
5 20 293 *13 -- --- Position
________________________
6 51 210 *14 -- --- MODE Hold
7 42 158 *15 -- ---
9 73 70 *16 10 64 LAT N 51:39:04.128
LON E 0:46:36.375
ELEV MASK 10 deg *attempting to track HGT +46.29 m
(MSL)
HEALTH MONITOR ......................................................... [
OK ]
Self Test: OK Int Pwr: OK Oven Pwr: OK OCXO: OK EFC: OK GPS Rcv:
OK
scpi > scpi > :system:status?
E-113> ------------------------------- Receiver Status
-------------------------------
E-121>
E-121> SYNCHRONIZATION ........................................... [
Outputs Invalid ]
E-113> SmartClock Mode ___________________________ Reference Outputs
_______________
E-113> Locked TFOM 9
FFOM 3
E-113> Recovery 1PPS TI --
E-113> Holdover HOLD THR 1.000 us
E-113> >> Power-up: GPS acquisition Holdover Uncertainty
____________
E-101> Predict --
E-113>
E-113> ACQUISITION .............................................. [ GPS
1PPS Invalid ]
E-113> Tracking: 0 ____ Not Tracking: 12 _______ Time
____________________________
E-113> PRN El Az PRN El Az UTC 18:00:50 [?]
13 Aug 2020
E-113> 2 47 282 *11 -- --- GPS 1PPS Invalid: not
tracking
E-103> 4 34 64 *12 -- --- ANT DLY 0 ns
E-103> 5 20 293 *13 -- --- Position
________________________
E-103> 6 51 210 *14 -- --- MODE Hold
E-103> 7 42 158 *15 -- ---
E-103> 9 73 70 *16 10 64 LAT N
51:39:04.128
E-103> LON E
0:46:36.375
E-113> ELEV MASK 10 deg *attempting to track HGT
+46.29 m (MSL)
E-113> HEALTH MONITOR
......................................................... [ OK ]
E-113> Self Test: OK Int Pwr: OK Oven Pwr: OK OCXO: OK EFC: OK
GPS Rcv: OK
E-113> scpi >
E-113> scpi > :system:status?
E-113> ------------------------------- Receiver Status
-------------------------------
E-121>
E-121> SYNCHRONIZATION ........................................... [
Outputs Invalid ]
E-113> SmartClock Mode ___________________________ Reference Outputs
_______________
E-113> Locked TFOM 9
FFOM 3
E-113> Recovery 1PPS TI --
E-113> Holdover HOLD THR 1.000 us
E-350> >> Power-up: GPS acquisition Holdover Uncertainty
____________
E-101> Predict --
E-113>
E-113> ACQUISITION .............................................. [ GPS
1PPS Invalid ]
E-113> Tracking: 0 ____ Not Tracking: 12 _______ Time
____________________________
E-113> PRN El Az PRN El Az UTC 18:00:50 [?]
13 Aug 2020
E-113> 2 47 282 *11 -- --- GPS 1PPS Invalid: not
tracking
E-103> 4 34 64 *12 -- --- ANT DLY 0 ns
E-103> 5 20 293 *13 -- --- Position
________________________
E-103> 6 51 210 *14 -- --- MODE Hold
E-103> 7 42 158 *15 -- ---
E-103> 9 73 70 *16 10 64 LAT N
51:39:04.128
E-103> LON E
0:46:36.375
E-113> ELEV MASK 10 deg *attempting to track HGT
+46.29 m (MSL)
E-113> HEALTH MONITOR
......................................................... [ OK ]
E-113> Self Test: OK Int Pwr: OK Oven Pwr: OK OCXO: OK EFC: OK
GPS Rcv: OK
E-113> scpi >
E-113> :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 19:43:25 [?] 13 Aug
2020
2 27 228 *26 -- --- GPS 1PPS Invalid: not tracking
5 63 284 *27 -- --- ANT DLY 0 ns
7 62 81 *28 -- --- Position
________________________
9 29 83 *29 -- --- MODE Hold
13 29 262 30 65 165
*25 -- --- *31 -- --- LAT N 51:39:04.128
LON E 0:46:36.375
ELEV MASK 10 deg *attempting to track HGT +46.29 m
(MSL)
HEALTH MONITOR ......................................................... [
OK ]
Self Test: OK Int Pwr: OK Oven Pwr: OK OCXO: OK EFC: OK GPS Rcv:
OK
E-113> ?
E-103> *CLS
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 19:56:10 [?] 13 Aug
2020
* 1 -- --- 7 58 72 GPS 1PPS Invalid: not tracking
2 22 224 * 8 -- --- ANT DLY 0 ns
* 3 -- --- 9 24 86 Position
________________________
* 4 -- --- *10 -- --- MODE Hold
5 68 273 13 34 265
* 6 -- --- 30 69 155 LAT N 51:39:04.128
LON E 0:46:36.375
ELEV MASK 10 deg *attempting to track HGT +46.29 m
(MSL)
HEALTH MONITOR ......................................................... [
OK ]
Self Test: OK Int Pwr: OK Oven Pwr: OK OCXO: OK EFC: OK GPS Rcv:
OK
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 20:02:13 [?] 13 Aug
2020
2 19 223 13 36 267 GPS 1PPS Invalid: not tracking
5 69 267 *14 -- --- ANT DLY 0 ns
7 56 69 *15 -- --- Position
________________________
9 22 88 *16 -- --- MODE Hold
*11 -- --- *17 -- ---
*12 -- --- 30 71 148 LAT N 51:39:04.128
LON E 0:46:36.375
ELEV MASK 10 deg *attempting to track HGT +46.29 m
(MSL)
HEALTH MONITOR ......................................................... [
OK ]
Self Test: OK Int Pwr: OK Oven Pwr: OK OCXO: OK EFC: OK GPS Rcv:
OK
scpi >
Dr David Kirkby Ph.D C.Eng MIET
Email: drkirkby at kirkbymicrowave.co.uk Web:
https://www.kirkbymicrowave.co.uk/
Kirkby Microwave Ltd (Tel 01621-680100 / +44 1621-680100)
Stokes Hall Lodge, Burnham Rd, Chelmsford, Essex, CM3 6DT.
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