It might be eye candy, but is very useful eye candy when coupled with the satellite SNR values. A GPSDO does not NEED any communications to the GPS or the outside world, but EVERY commercial one does support it. The GPSDO firmware asks for the sat info from the GPS (so it can show it in the SYST:STAT status page) and, if it doesn't get it, it assumes the GPS is defective, crawls into a corner, and sobs. ---------------- > Isn’t info about what satellites are where, just eye candy and irrelevant to a real GPSDO?

Hi At some very basic level, the GPSDO needs to decide when to go into or come out of holdover. That decision often involves initial setup of the GPS module and subsequent monitoring of the module. The risk in swapping modules is always tripping over an obscure IF statement somewhere that does not work right with the “new” module. On the Lucent boxes, there is a survey process “up front’ that likely gets tangled when you change modules ….. Bob > On Nov 15, 2017, at 1:27 AM, Mark Sims <holrum@hotmail.com> wrote: > > It might be eye candy, but is very useful eye candy when coupled with the satellite SNR values. A GPSDO does not NEED any communications to the GPS or the outside world, but EVERY commercial one does support it. > > The GPSDO firmware asks for the sat info from the GPS (so it can show it in the SYST:STAT status page) and, if it doesn't get it, it assumes the GPS is defective, crawls into a corner, and sobs. > > ---------------- > >> Isn’t info about what satellites are where, just eye candy and irrelevant to a real GPSDO? > _______________________________________________ > 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.

Is there an easy way to get 10Mhz out of the REF1? Next time I am using my electric screwdriver to take this apart. I can’t believe how many bolts it has. I used a screwdriver that turns double in reverse, pretty cool tool, but even then it took forever. > On Nov 15, 2017, at 7:00 AM, Bob Camp <kb8tq@n1k.org> wrote: > > Hi > > At some very basic level, the GPSDO needs to decide when to go into or come > out of holdover. That decision often involves initial setup of the GPS module and > subsequent monitoring of the module. The risk in swapping modules is always > tripping over an obscure IF statement somewhere that does not work right with > the “new” module. On the Lucent boxes, there is a survey process “up front’ that > likely gets tangled when you change modules ….. > > Bob > >> On Nov 15, 2017, at 1:27 AM, Mark Sims <holrum@hotmail.com> wrote: >> >> It might be eye candy, but is very useful eye candy when coupled with the satellite SNR values. A GPSDO does not NEED any communications to the GPS or the outside world, but EVERY commercial one does support it. >> >> The GPSDO firmware asks for the sat info from the GPS (so it can show it in the SYST:STAT status page) and, if it doesn't get it, it assumes the GPS is defective, crawls into a corner, and sobs. >> >> ---------------- >> >>> Isn’t info about what satellites are where, just eye candy and irrelevant to a real GPSDO? >> _______________________________________________ >> 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.

I found the write-up on getting 10Mhz out. I added the resistors and cap and brought it out the 15Mhz connector after separating it from the 15Mhz drive. I booted it up and I have a Yellow No GPS light and a Red Fault. The unit sees the GPS antenna as when I disconnect it the GPS light blinks. I have the interface plug jumper with 2-8 and 3-13 shorted. I’ve seen others that say to take 2 and 3 to 8 and I will try that next. I was very careful in the entire process as it is tough to get the motherboard out of the frame. I am getting 10Mhz on the 15Mhz TP as expected. This is using the original REF1 GPS board. Any ideas? Not seeing any sats on lady heather at all. The antenna is known to be good. Thanks, close but I hope I didn’t do more harm than good. Jerry

OK, go figure, after resetting the loopback jumpers it came alive with a green light, GPS time is ok, still not presenting a satellite on the LH display but it must be seeing something to have the time correct. Interesting project all along. > On Nov 15, 2017, at 12:03 PM, Jerry Hancock <jerry@hanler.com> wrote: > > I found the write-up on getting 10Mhz out. I added the resistors and cap and brought it out the 15Mhz connector after separating it from the 15Mhz drive. > > I booted it up and I have a Yellow No GPS light and a Red Fault. The unit sees the GPS antenna as when I disconnect it the GPS light blinks. I have the interface plug jumper with 2-8 and 3-13 shorted. I’ve seen others that say to take 2 and 3 to 8 and I will try that next. I was very careful in the entire process as it is tough to get the motherboard out of the frame. I am getting 10Mhz on the 15Mhz TP as expected. This is using the original REF1 GPS board. > Any ideas? Not seeing any sats on lady heather at all. The antenna is known to be good. > > Thanks, close but I hope I didn’t do more harm than good. > > Jerry > _______________________________________________ > 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.

Just to close this one out, I was able to get the Ref-0 and Ref-1 working standalone with 10Mhz on both using my spare Motorola UT+ GPS. Lots of help from lots of people and especially Peter Garde who stuck with me to the end. It would be nice if all this was in one place or maybe one combined document. Anyway, now I have two, so I’ll be guessing which one is right half the time. Thanks, Jerry