Re: [time-nuts] Efratom/Datum GPSDO GPS-FC

2015-06-01 Thread Bob Camp
Hi The biggest issue I see is that the module thinks it’s in the vicinity of New York City. Since it’s in position hold mode, it’s not going to lock up at your location. Next step is to watch the module dialog as it boots up. See what the CPU on the board is doing to the module at power on.

Re: [time-nuts] Efratom/Datum GPSDO GPS-FC

2015-06-01 Thread paul swed
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

Re: [time-nuts] Efratom/Datum GPSDO GPS-FC

2015-06-01 Thread Vlad
Its definitely VC TCXO. For the tests, I disconnected GPS-FC embedded antenna and connect it to my GPS distribution amplifier. In this case I could have GPS signal indoor. Its not perfect. But should be enough for troubleshooting. I soldered TTL Serail sniffer to GPS-FC and I got

Re: [time-nuts] Efratom/Datum GPSDO GPS-FC

2015-06-01 Thread Vlad
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

Re: [time-nuts] Efratom/Datum GPSDO GPS-FC

2015-06-01 Thread Mike Cook
Le 1 juin 2015 à 15:38, Vlad t...@patoka.org a écrit : 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

[time-nuts] Efratom/Datum GPSDO GPS-FC

2015-05-31 Thread Vlad
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

Re: [time-nuts] Efratom/Datum GPSDO GPS-FC

2015-05-31 Thread Bob Camp
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