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 <kb...@n1k.org> 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 <t...@patoka.org> 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. > > _______________________________________________ > > time-nuts mailing list -- time-nuts@febo.com > > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.