Re: [time-nuts] 60Hz More or Less
That's it!! From: Tom Van Baak To: Discussion of precise time and frequency measurement Sent: Sun, April 1, 2012 5:59:11 PM Subject: Re: [time-nuts] 60Hz More or Less > I used to have a webpage bookmarked where they did this. The author of the >page hooked up a hydrogen maser to an HP3325b set to 60 Hz then drove an HP >bipolar amplifier with the 3325 to drive a mechanical flip clock at 100 VAC @ >60.00 Hz. Interesting page, is billed as Worlds most accurate mechanical >clock. OBTW, he had several HP cesiums available too. . . > > Randy, KI6WAS http://leapsecond.com/pages/atomic-nixie/ /tvb ___ 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.
Re: [time-nuts] Lucent RFTG-m-XO GPSDO
There are scans of the L-Pro service manual out there. Google should help here. Randy From: Peter Bell To: Discussion of precise time and frequency measurement 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 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.
Re: [time-nuts] List Noise Level [was...]
why reply at all? From: Poul-Henning Kamp To: Discussion of precise time and frequency measurement Sent: Thu, July 14, 2011 8:00:43 AM Subject: Re: [time-nuts] List Noise Level [was...] In message , "William H. Fite" writes: >Like this polemic didn't worsen the S/N ratio? If you take a clue from it, it will improve the S/N ratio. Seeing that you sent a 1-line reply, quoting the entire message, in a discussion about S/N ratio does not give me high hopes however, and I will happily be the first to move that you get thrown off the list, if you don't acquire clue rapidly. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. ___ 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.
Re: [time-nuts] HP 5065A rubidium lifetime
Try measuring a known length of the resistance wire, say 6 inches and then double. . . Randy Hi Next step would be to figure out what a reasonable ohms / foot number is. Bob On Mar 21, 2010, at 12:41 AM, Chuck Harris wrote: > HP just wound two parallel wires around the cylinder. They did not > twist. The wires at the entrance end of the solenoid went to the > electronics, the wires at the exit end of the solenoid were shorted > together... I think they used a crimp for the short. > > -Chuck Harris > > J. L. Trantham wrote: >> Do you make a 'twisted pair' and then wind that or just wind two parallel >> wires around the cylinder? >> Joe > > ___ > 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.
