[time-nuts] Datum 9390 issues & spectracom 8195a woes

[paul swed]

Downloaded the manual not too helpful with respect to the schematic.
Further its not clear to me one way or another that the antenna was
actually the first down converter as had been the case with older systems.
A bit of a clue maybe is that the antenna could be up to 350 ft away from
the rcvr.
But assuming it was just an active antenna. Some of the rcvrs need a bit of
current drawn on the antenna port to believe there is an antenna. Try a 450
ohm R to ground.
Oddly though the front panel on these rcvrs normally alarm if they don't
believe they have an antenna.
Good luck
Paul
WB8TSL



On Sun, Jun 9, 2013 at 1:15 PM, Tammy A Wisdom <tammy-lists at wiztech.biz>wrote:

> Hi all
> I have a datum 9390 that will pick up GPS and get the date etc but will
> not go into oscillator lock state. Anyone have any suggestions on this?
>
> Next up is the spectracom 8195a I have. Allegedly it was working when
> removed from an American tower site. Sadly it doesn't see any GPS
> satellites. I'm guessing when it was removed someone cut the antenna coax.
> It still has 4.5v dc on the antenna port but never sees any satellites.
> This device uses oncore gps module. Does anyone know if a) if I replace
> said oncore module will it actually work & b) is there anything goofy they
> did with the antennas on these units?  & c) is it possible they blew the
> front end of the oncore?  I'm using a trimble bullet antenna with both
> devices
>
> That all said. If you have a working 9390 or 819x gps reciever that you
> would consider parting with please let me know. I'm trying to put together
> a ntp server for my collocation facility.
>
> Thank you
> Tammy A Wisdom
>
>
> Sent from my iPhone
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