[time-nuts] 58503A does not track
claude.ff at aliceadsl.fr
claude.ff at aliceadsl.fr
Thu Jan 28 01:37:15 EST 2016
Thanks for your reply
I don't think it's a computer problem because I can see the GPS is not locked when I compare the 10 MHz output with a Rubidium.
By the way, I don't use software but the screen command under Linux.
Maybe the motorola bord is dead, I will investigate this : I have to send commands directly to the board, as suggested by someone offlist.
The board in the GPSDO is a Motorola 84D43579M03 . The same as this one :
http://www.ebay.com/itm/HP-Z3801A-Z3805A-GPS-Module-Motorola-Oncore-P-N-84D43579M03-/161594138402?nma=true&si=jnWr5n2KQf1WL6JylF%252BMgtIr1%252FM%253D&orig_cvip=true&rt=nc&_trksid=p2047675.l2557
Do you think it can be replaced by this one :
http://www.ebay.com/itm/Z3801A-Z3805A-GPS-Receiver-VP-oncore-B4121Z1116-/281670591394?hash=item4194e023a2
Thanks
Claude
----- Mail original -----
De: "Artek Manuals" <Manuals at ArtekManuals.com>
À: "Discussion of precise time and frequency measurement" <time-nuts at febo.com>
Envoyé: Jeudi 28 Janvier 2016 00:27:43
Objet: Re: [time-nuts] 58503A does not track
Claude
Are you using the same software on the same computer platform for the
whole time?
By example I have a Z3801 which works sometimes under Z38xx and
sometimes not, while SATSTAT works all the time. I did find some flaky
things going on with the software and was finding that I had to close
Z38xx and reopen it after every command to change something?
Dave
On 1/26/2016 11:39 AM, claude.ff at aliceadsl.fr wrote:
> Hello list !
>
> I have a HP 58503A who worked fine for two years.
> After a short power cut, it does not lock on GPS. I tried some commandsn including :SYST:PRESET but nothing works
>
> Here's a :SYSTEM:STATUS ? after the PRESET and after waiting a few hours :
>
>
> ------------------------------- 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: 6 ________ Time ____________________________
> PRN El Az UTC 16:06:43 [?] 29 Feb 2016
> * 1 -- --- GPS 1PPS Invalid: not tracking
> * 6 -- --- ANT DLY 0 ns
> * 9 -- --- Position ________________________
> *14 -- --- MODE Survey: 0% complete
> *22 -- --- Suspended: track <4 sats
> *24 -- --- INIT LAT N 596:30:43.423
> INIT LON E 596:31:10.845
> ELEV MASK 10 deg *attempting to track +21474708.00 m (MSL)
> HEALTH MONITOR ......................................................... [ OK ]
> Self Test: OK Int Pwr: OK Oven Pwr: OK OCXO: OK EFC: OK GPS Rcv: OK
>
> I tried to set the date with :GPS:INIT:DATE 2016,01,26 but this command has no effect.
>
> Setting the LAT and LON with :GPS:POS «myposition» works.
>
> ------------------------------- 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: 6 ________ Time ____________________________
> PRN El Az UTC 02:58:13 [?] 24 Mar 2016
> * 3 -- --- GPS 1PPS Invalid: not tracking
> * 4 -- --- ANT DLY 0 ns
> * 8 -- --- Position ________________________
> * 9 -- --- MODE Hold
> *23 -- ---
> *29 -- --- LAT N blah blah
> LON E blah blah
> ELEV MASK 10 deg *attempting to track HGT +194.57 m (MSL)
> HEALTH MONITOR ......................................................... [ OK ]
> Self Test: OK Int Pwr: OK Oven Pwr: OK OCXO: OK EFC: OK GPS Rcv: OK
>
>
> But the unit is still not tracking, it sees the birds because the PRN are changing but
> does not calculate the "El" and "Az" ...
>
> Here is the output of :DIAGnostic:LOG:READ:ALL?
>
> Log 001:20160122.00:00:00: Log cleared
> Log 002:20160122.00:00:00: System preset
> Log 003:20160122.00:00:35: Self-test failed
> Log 004:20160122.00:12:38: Position hold mode started
>
> As you can see, the date is 2016-01-22, it's the date when the power cut happened .
>
> And when I run :GPSYSTEM:POSITION:SURVEY ONCE, I get the same first status with crazy
> lattidude and longitude.
>
>
> Finally a self test *TST? gives +0 and the ALARM LED and the LOCK LED are off.
>
> I've tried with a second antenna and have the same problem :-(
>
> Can someone give me an advice for this problem ? The receiver looks dead, no ?
>
> Thanks in advance,
>
>
> Claude
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--
Dave
Manuals at ArtekManuals.com
www.ArtekManuals.com
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