Have you got any pointers? The only document I could find was a "repair guide" prepared by PE1FBO - and whiile it's certainly useful (especially for the specific purpose of getting my unit running), it's not the original Efratom info. Maybe it's my history in the avionics business, but I really like to use official docs if possible :)
Regards, Pete On Mon, Oct 10, 2011 at 1:01 PM, randy hunt <randy_hunt...@yahoo.com> wrote: > There are scans of the L-Pro service manual out there. Google should help > here. > > Randy > > > > > ________________________________ > From: Peter Bell <bell.pe...@gmail.com> > To: Discussion of precise time and frequency measurement <time-nuts@febo.com> > Sent: Sun, October 9, 2011 9:13:14 PM > Subject: Re: [time-nuts] Lucent RFTG-m-XO GPSDO > > On Mon, Oct 10, 2011 at 2:41 AM, k4...@aol.com <k4...@aol.com> wrote: >> Hi Peter, yes it sounds like the UT+ is defective if it never gets any sats. >> You can probably find one on eBay. Someone probably fired RF into the >> receiver >>front-end and zapped it. I think the antenna you are using should be OK. >> >> I will look for my drawings on this unit and send copies to you. And I know >> I >>have the software too, just need to find it! >> >> I have read in some of the notes here on time-nuts that people may be able to >>use RS232 for communicating with the RFTG units. But it was designed for >>RS422 >>and I would suggest you use RS422 for best results. I use a little >>RS422-4S232 >>converter which has worked fine for me. >> >> The early units had FRS rubidiums in them. The LPRO was used in the newer >>units. So, you have the more recent design. > > Any documentation you can provide would be very helpful - I'm pretty > much sure, based on the comments made by yourself and the other people > on the list, that my GPS Rx is broken - I just found my other oncore > (a VP) and that works correctly in the same test setup that the UT+ > out of the RFTG failed to track in. I also tried the little Motorola > antenna on both boards, with the same results. I tried plugging the > VP into the Lucent box, but it doesn't seem to like it (the fault > light just stays on), so I have ordered a replacment UT+ board. > > I assume the units that had a FRS in them had different PCBs? The > LPRO is plugged directly into the baseboard on my RB unit (KS-24019 > L105B, if that means anything) and it seems to be pretty clearly > designed around it. The XO (KS-24019 L106C) has the same PCB in it, > except that there is an extra section of PCB with an Efratom OCXO > mounted on it where the LPRO is in the RB unit. > > It's sort of a pity it's not an FRS - I've fixed some of those in the > past, and they were pretty straightforward things to work on - all > standard parts and it had the schematic in the manual - all the LPRO > manual says is "not user-servicable; send it back to us" - but that > lamp heater circuit looks fairly simple anyway, so I guess I can have > a go at that while I'm waiting for the GPS board to arrive. > > And thank you to everyone that offered suggestions. > > Regards, > > Pete > > _______________________________________________ > 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.