[time-nuts] NTBW50AA Problem

Michael Bauer mjbauer46 at gmail.com
Sat Jan 9 14:42:43 EST 2016


Thanks for responding.  Unfortunately I don't have another GPS receiver.

The coax is RG6 with solid center conductor.  I can put AIM4170 antenna
analyzer on it but mine only goes up to 180 MHz.  Coax could show quite OK
at 180 and be a lot different at 1500.  Won't hurt to try tho.

On Fri, Jan 8, 2016 at 8:31 PM, Lizeth Norman <normanlizeth at gmail.com>
wrote:

> Can you attach another gps reciever to the coax and confirm it's a
> receiver issue?
> Can you test coax with a load on one end and a antenna analzyer at the
> other to ensure performance at some reasonable value (432 MHz)?
> RG-59 (solid core) can do some odd stuff.
> 73 from el89va
> n3ykf
>
> On Fri, Jan 8, 2016 at 8:49 PM, 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.
> >
> > 73,
> >
> > Mike - W7GW
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