Paul,
For the testing purpose, I connecting GPS-FC to my GPS Distribution Amp.
This is why antenna has disconnected on the picture. When I testing this
unit - i connecting coax to it.
Yesterday, I connected TTL serial to its Motorola Module, to see what is
going on there. Here is screenshots:
http://www.patoka.ca/OCXO/Moto1.JPG
http://www.patoka.ca/OCXO/Moto2.JPG
I left that unit up and running overnight, and even after that its still
not show me real location and number of "visible" satelites is still
"zero".
Regards,
Vlad
On 2015-05-31 21:50, paul swed wrote:
Quite difficult to see. But it appears the gps antenna cable is just
hanging there not connected to what I presume would be a antenna.
Regards
Paul
WB8TSL
On Sun, May 31, 2015 at 4:47 PM, Bob Camp <[email protected]> wrote:
Hi
If you look at the pictures you can see the oscillator they are using
for
the 10 MHz. At least as far as I can see
it’s markings look like those of a VC TCXO. If you mount the device
outdoors (as you must to get it to work) there
will be a lot of temperature swings. In if the little oscillator *is*
an
OCXO, it’s not a fancy one. Between the
simple oscillator and the outdoor location, you are unlikely to get
very
good performance out of the unit.
The Oncore in this device has many of the same issues as ones we have
discussed in other GPSDO’s. The
design of the one in your gizmo is now approaching 20 years old. The
interface strings are well documented
and you should be able to tap into the module’s i/o stream to see
what’s
going on. I would recommend tacking
a TTL to USB converter onto it and letting a terminal program show you
what is happening.
Bob
> On May 31, 2015, at 11:58 AM, Vlad <[email protected]> wrote:
>
>
>
> Hello,
>
> Some time ago, I got Efratom/Datum GPS-FC item. The apparatus itself
looks like good quality weather-proof aluminium case with embedded GPS
antenna. It has only one connector. That connector is using to supply
the
power to the unit and as well to get 10Mhz signal from it.
>
> Here is the sticker inside of the devices:
>
> http://www.patoka.ca/OCXO/GPS-FC-LBL.JPG
>
> I tried to play with this device, however all my attempts to get 10 Mhz
from it has failed.
>
> Here is how its looks inside:
>
> http://www.patoka.ca/OCXO/GPS-FC-PCB.JPG
>
>
> AFAIK, there is Motorola Oncore GPS. I checked the 1PPS signal from that
module and its looks good - I see the 1PPS on my scope.
> Also I did check on TP4 on PCB. Looks like its an output from 10Mhz
VTCXO. And I see the sine on the scope.
>
> I tried to contact Microesemi to obtain some service manual or even
schematic for this unit, but unfortunately its not an option.
Microsemi
sent me only this manual:
>
> http://www.patoka.ca/OCXO/GPS-FC-Manual.pdf
>
>
> Its appeared this units out of support for long period of time. So, I
would ask if anybody knows anythings about it ? Especially I would be
interested about what to measure/expect on control points on PCB. I
still
hope its repairable. Thanks in advance !
>
>
>
> --
> WBW,
>
> V.P.
> _______________________________________________
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--
WBW,
V.P.
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