[time-nuts] NTBW50AA Problem
azelio.boriani at gmail.com
Sat Jan 9 06:27:42 EST 2016
If there is a problem in the RF front-end, no software can report
this... actually the only way to test the radio section of a GPS
receiver is to just connect it to an antenna (unless there is a GPS
On Sat, Jan 9, 2016 at 2:49 AM, Michael Bauer <mjbauer46 at gmail.com> wrote:
> My subj Nortel Trimble GPSTM had been working well for about two years.
> Changed QTH by about 20 miles, reconnected with same power supply, coax and
> antenna. Cannot see any GPS satellites or 10 mHz output (9.8MHz on 8X Chip
> is present and front panel LEDs show the unit responding to software
> commands as before).
> Lady Heather and tboltmon both report ROM, RAM, OSC, POWER, EEPROM and
> ANTENNA OK thru RS-232 interface. Replaced bullet antenna anyway - no
> change. 5VDC present at antenna and it draws about 33 mA. Other local GPS
> devices (two vehicles and one EarthMate) achieve 3D fixes from ground level
> antennas. Performed warm, cold and hard resets (erasing former GPS
> position), min elevation set at 15 degrees. Survey starts, but doesn't
> proceed. All eight satellite status lines show yellow and zero's across.
> Undisciplined, No GPS time, no Posn. Start date is reported as 07 April
> 2019 week 2048.
> The unit performed flawlessly at previous QTH frequently showing good
> signals from 7-8 GPS satellites. What happened? Do I have a broken box
> that cannot be detected by software control/reporting programs?
> Thanks in advance for any ideas.
> Mike - W7GW
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