Thank you - I've downloaded it and it looks very interesting - I guess I need to dig out my RS232-RS422 converter and have a play.
Regards, Pete On Tue, Oct 18, 2011 at 7:35 AM, [email protected] <[email protected]> wrote: > All that's interested, KO4BB now has my RFTGm information on his manuals > section under GPS Timing. Please let me know if you have questions about > it. 73's, Doug, K4CLE > > Connected by DROID on Verizon Wireless > > -----Original message----- > From: "Randy D. Hunt" <[email protected]> > To: Discussion of precise time and frequency measurement > <[email protected]> > Sent: Wed, Oct 12, 2011 16:53:04 GMT+00:00 > Subject: Re: [time-nuts] Lucent RFTG-m-XO GPSDO > > On 10/11/2011 6:28 PM, Peter Bell wrote: >> >> For some reason, the "No GPS" LED is back - although the GPS is >> tracking 8 satellites in 3D mode and according to the TRAIM status the >> timing error is below the alarm threshhold (alarm = 1300ns, current = >> 43ns) - I guess the uinit has it's own standards for the GPS quality, >> and they are being violated in some way. >> >> Still. at ;least I have seen it running with that LED off, which is a >> positve sign :) >> >> >> On Wed, Oct 12, 2011 at 5:42 AM, [email protected]<[email protected]> wrote: >>> >>> If I recall, the firmware in the RFTGm collects about an hours worth of > > position info and does an average to establish a self-survey. The next time > you cycle power, it will check the new position against the stored one and > if within 50 feet or so, it will use the stored position. That's probably > why it took a while for the LED to extinguish. >>> >>> Connected by DROID on Verizon Wireless >>> >>> -----Original message----- >>> From: Peter Bell<[email protected]> >>> To: Discussion of precise time and frequency > > measurement<[email protected]> >>> >>> Sent: Tue, Oct 11, 2011 12:49:45 GMT+00:00 >>> Subject: Re: [time-nuts] Lucent RFTG-m-XO GPSDO >>> >>> The Rx was defective - I just got the new one, hooked it up to my >>> little test rig anf the antenna, and it happily picked up satellites >>> and got a position fix. >>> >>> Swapped it into the box, and found a TTL level copy of the RX data >>> stream from the encore on pin 2 of the interface connector, so hooked >>> that up to a TTL->RS232 converter so I could monitor what was >>> happening. It all seemed to be tracking OK, although the "No GPS" LED >>> was still on, so I just left it and after a couple of hours the LED >>> went out. >>> >>> Next step is getting the Rb working :) >>> >>> >>> On Mon, Oct 10, 2011 at 2:41 AM, [email protected]<[email protected]> 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. >>>> >>>> Connected by DROID on Verizon Wireless >>>> >>>> -----Original message----- >>>> From: Peter Bell<[email protected]> >>>> To: Discussion of precise time and frequency > > measurement<[email protected]> >>>> >>>> Sent: Sun, Oct 9, 2011 05:52:25 GMT+00:00 >>>> Subject: Re: [time-nuts] Lucent RFTG-m-XO GPSDO >>>> >>>> On Sun, Oct 9, 2011 at 3:31 AM, [email protected]<[email protected]> wrote: >>>>> >>>>> Peter, do you have the software for this unit? The GPS antenna is > > supposed >>>>> >>>>> to draw apx. 20 mA at 5 volts in order for the NO GPS LED to turn off. >>>>> > > AT&T >>>>> >>>>> (Lucent) used the MicroPulse timing antenna (later sold and now > > provided by >>>>> >>>>> PCTE). You are correct in that Efratom used the Motorola UT+ 8 channel > > GPS >>>>> >>>>> receiver on these units. The rubidium companion box used the data from > > the >>>>> >>>>> same receiver (via an interconnect cable between the two units). Let > > me >>>>> >>>>> know if you have questions on this unit, Regards, Doug.... >>>>> Connected by DROID on Verizon Wireless >>>>> >>>>> -----Original message----- >>>>> From: Peter Bell<[email protected]> >>>>> To: [email protected] >>>>> Sent: Fri, Oct 7, 2011 14:13:31 GMT+00:00 >>>>> Subject: [time-nuts] Lucent RFTG-m-XO GPSDO >>>>> >>>>> I have been playing with one of these units, and noticed that there >>>>> has been some discussion on them before on this list, so I wondered if >>>>> anyone might have any suggestions. >>>>> >>>>> Basically, the unit powers up correctly, but the "No GPS" LED never >>>>> goes off - this obviously could be because it's broken or doesn't like >>>>> my antenna, but with some of these telecom GPSDOs you have to manually >>>>> trigger a site survey if you move them to another location. Does >>>>> anyone know if this Lucent box is like that? >>>>> >>>>> Everything else seems to be working - once the "OK" light comes on the >>>>> 15MHz output is enbled, the "No GPS" LED goes from solid to blinking >>>>> if you disconnect the antenna - it just doesn't want to get GPS lock. >>>>> >>>>> I suppose I could pull the Oncore board (a UT+ according to the label) >>>>> out of it and test that on it's own - but I thiought I would see if >>>>> maybe it's a known issue first. >>>>> >>>> Hi, Doug >>>> >>>> I don't have any documentation at all - just the actual box. The >>>> antenna is one that originally came with a Furuno marine GPS, but the >>>> spec looks plausible (+5V @ 40mA, Internal L1 preamp with 26dB gain - >>>> and it has worked with several other GPS units without problems. >>>> >>>> I just pulled the oncore out, and connected it up outside the box - >>>> and it doesn't work. It passes the self test with a response code of >>>> 0000 (or 8000 with the antenna disconnected / 4000 with a short on the >>>> antenna socket - so it seems the current consumption is OK) - but no >>>> matter how long you leave it it still says it's tracking 0 satellites, >>>> although it happiy generates status reports. >>>> >>>> I wonder if this UT+ version is expecially sensitive to the antenna? >>>> I remember that the oncore VP would work with pretty much anything you >>>> hooked up to it. Of course, it's equally possible that the GPS module >>>> is defective. >>>> >>>> I'm tending towards broken - I also got an RTFG-m-RB with this unit, >>>> and that has a faulty LPRO-101 in it (it's probably fixable - it looks >>>> like the FET that heats up the Rb cell had gone open circuit) - and >>>> the two units together only cost me $40 supplied on a "status unkown, >>>> but likely defective" basis. I should get at least $40 of >>>> entertainment out of trying to fix them :) >>>> >>>> _______________________________________________ >>>> time-nuts mailing list -- [email protected] >>>> To unsubscribe, go to > > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>>> >>>> and follow the instructions there. >>>> _______________________________________________ >>>> time-nuts mailing list -- [email protected] >>>> To unsubscribe, go to > > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>>> >>>> and follow the instructions there. >>> >>> _______________________________________________ >>> time-nuts mailing list -- [email protected] >>> To unsubscribe, go to > > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>> >>> and follow the instructions there. >>> _______________________________________________ >>> time-nuts mailing list -- [email protected] >>> To unsubscribe, go to > > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>> >>> and follow the instructions there. >> >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to > > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> >> and follow the instructions there. >> > The 'no gps light' on mine comes on periodically (usually aroundmidnight) > then goes off after a while. My antenna is not in the bestlocation, on > window sill in corner. But, for the most part, it staysoff most of the > time. . . > > Randy > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
