Re: [time-nuts] Surplus Lucent RFTG-m-II units in rack shelf
I bought one also. Figured it was worth $150 in educational value alone given I've never done anything with Rb before. Hope it ends up being a good lesson and not a bad one. hi hi 73/jeff/ac0c www.ac0c.com alpha-charlie-zero-charlie -Original Message- From: paul swed Sent: Friday, May 12, 2017 8:05 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Surplus Lucent RFTG-m-II units in rack shelf Hello to the group. A good price but the RBs are quite old I have 4 of these units purchased at $25 each some 4 years ago. Like the oscillator. Well worth what I paid. RBs are OK but aged and running out of fumes. I have reheated the rb lamp and recovered several of the units. Good luck. Regards Paul WB8TSL On Fri, May 12, 2017 at 4:48 AM, Clint Jay wrote: Congratulations, I was mulling over buying it, even just for resale if the Rb standard worked its worth way more than the asking price, looking forward to seeing the results of testing. On 12 May 2017 9:18 am, "Iain Young" wrote: > On 12/05/17 07:23, Gregory Beat wrote: > > As noted by Bob Camp, this Lucent pair has a rubidium standard and OCXO. >> Since I posted (15 hours ago), he has sold 18 units. >> > > Think I just grabbed the last one. > > Note, judging by the pictures, the 10MHz reference from the Rb is fed > to the GPS receiver, and that outputs 15MHz (presumably disciplined). > The output on the right hand side of the Rb unit looks to be 15MHz. > > Also interesting, the splitter appears to have two inputs. I'm guessing > that's two splitters, or more likely for this gear, for fail over, > and only one output is active. > > Should be fun to find out. I'm betting more than just me acquired one > on this list. Like Gregory, I'd love to see the good/bad/ugly, both > in Frequency and Time > > (It's likely to be two weeks before it arrives here, and I'll not get > chance to play until at least the second half of June, so I bet others > will get there ahead of me) > > > Iain > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/m > ailman/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. ___ 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] Vectron 233Y5317 OCXO data 250 Mhz
Thank you gentlemen! 73/jeff/ac0c www.ac0c.com alpha-charlie-zero-charlie -Original Message- From: Bob Raker Sent: Thursday, March 16, 2017 6:48 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Vectron 233Y5317 OCXO data 250 Mhz Jeff, You have a 250MHz VCXO +/100 ppm deviation for +/-5V 12V supply Here are general specs: https://www.vectron.com/products/vcxo/co-233vf_233vfw.htm 73, BR On Thu, Mar 16, 2017 at 4:51 PM, Jeff AC0C wrote: Looking for a datasheet for this OCXO, or for the general family. Thanks! 73/jeff/ac0c www.ac0c.com alpha-charlie-zero-charlie ___ 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.
[time-nuts] Vectron 233Y5317 OCXO data 250 Mhz
Looking for a datasheet for this OCXO, or for the general family. Thanks! 73/jeff/ac0c www.ac0c.com alpha-charlie-zero-charlie ___ 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] Bye-Bye Crystals
Making a finished crystal, especially a high-Q one of a target frequency far removed from the 8-10 Mhz sweet spot, is definitely one of those projects that is a lot harder than you would think it is. I was down at ICM a few years back when we were building some high-Q 70 Mhz VHF crystals for a filter project and it was amazing the amount of stuff they had there. 73/jeff/ac0c www.ac0c.com alpha-charlie-zero-charlie -Original Message- From: Bob Camp Sent: Monday, March 13, 2017 5:19 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Bye-Bye Crystals Hi …. ummm …. errr … Add to that: X-ray gear to work out the orientation of the (possibly natural) bar you are sawing Lapping gear to get the blanks flat (as optically flat) Automated / sorting X-ray gear to figure out what’s what after they are lapped Rounding equipment to turn the square ones into round ones without damaging them Contouring gear to put the proper shape on one or both sides (or pipes) Polishing gear to finish the shaping process Etching baths to get the surface to it’s final condition High vacuum cleaning to get all the crud off of all the parts before you do much of anything with themA base plater to put on the initial electrodes Mounting fixtures to get the crystal into the holder Cement curing (generally vacuum based) gear Plate to frequency gear That’s a short list, there actually is a bit more on a full list. The cleaning gear can get pretty extensive depending on the end application. Bob On Mar 13, 2017, at 3:56 PM, Attila Kinali wrote: On Mon, 13 Mar 2017 15:01:39 + Adrian Godwin wrote: What minimal equipment would you need to make your own crystals ? The equipment is quite minimal: * A diamond precision saw to cut the crystals * Some tool to check the accuracy of the cut (orientation and thicknes) * a lapping/grinding machine * an electroplating machine (usually sputtering) for the electrodes. * either some machine to produce the crystal holder yourself or buy them * vacuum system to evacuate the crystal holder and to bake everything * something to (cold) weld the case close All of this can be put in a (relatively) small workshop. The difficulty is also not producing quartz crystals in holders. The difficulty controlling the whole process to such an degree that you get high quality crystals at the frequency you want. If you managed to do that, you can further improve your system by using a BVA[1,2] like geometry, where the electrodes are not on the resonator itself but on the surrounding crystal, which acts at the same time as holder. But be warned, many attempted to re-create the BVAs but few succeeded... and none but Oscilloquartz ever managed to produce a economically viable product. Attila Kinali [1] http://www.nature.com/articles/srep02132/figures/1 [2] http://www.nature.com/articles/srep02132/figures/2 -- It is upon moral qualities that a society is ultimately founded. All the prosperity and technological sophistication in the world is of no use without that foundation. -- Miss Matheson, The Diamond Age, Neil Stephenson ___ 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.
[time-nuts] WTB: GPSDO
We had a small tornado come through north of our house about 1/2 mile on Monday. Really did a number on the antennas. Only electronics impacted was my old Nortel GPSDO. It’s pretty much deaf now, as far as I can tell. The Nortel always had a hard enough time obtaining the initial lock in the past on startup, but since “the event” it’s been no joy. So I’m in the market for a GPSDO. Key application here is as a bench precision frequency reference. Something with good composite noise performance close in. If you have a suitable GPSDO in solid operational condition, kindly contact me off list. Thanks! 73/jeff/ac0c www.ac0c.com alpha-charlie-zero-charlie ___ 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] No sat positions in LH with Trimble NTBW50AA?
I have a '50AA here. But I don't use any command line options relating to box ID. Just start up LH - LH talks to the box, determines it's a Trimble variant, and off to the races it goes. 73/jeff/ac0c www.ac0c.com alpha-charlie-zero-charlie -Original Message- From: Peter Reilley Sent: Thursday, January 05, 2017 12:11 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] No sat positions in LH with Trimble NTBW50AA? I tried /rxt but that won't communicate. Must I put the unit in Thunderbolt mode?Is there a jumper or a command that will do it? The manual that I have does not mention different modes. It only talks about SCPI. Thanks, Pete. On 1/5/2017 12:41 PM, Mark Sims wrote: The Nortel devices can talk either as a Thunderbolt or as a SCPI device. Use it as a Thunderbolt (/rxt). In SCPI mode the satellite positions are polled for once a minute (at xx:xx:33). Thunderbolt mode provides much more and better control of the receiver. --- I just got my Trimble NTBW50AA GPSDO up and running with Lady Heather 5.0. However I don't see any satellite data as I do with my Resolution T. I am using ___ 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.
Re: [time-nuts] Line Voltage - USA
The electric company in OKC repaired a pole problem at my parents house there a few years back. Somehow they managed to hook up the 240 across a single leg of the 120. Fried most of the electrical stuff in the house and caused enough damage to the house to require a complete rewiring. Parents lived in a motel for about a month while the work was done. The insurance company and the utility were transparent, covering all costs including replacement with new similar products without issue (other than the inconvenience). I think the electric company was especially glad that a fire did not result and there was no legal action as a result. 73/jeff/ac0c www.ac0c.com alpha-charlie-zero-charlie -Original Message- From: Hal Murray Sent: Wednesday, January 04, 2017 2:42 AM To: Discussion of precise time and frequency measurement Cc: hmur...@megapathdsl.net Subject: Re: [time-nuts] Line Voltage - USA Did the utility replace the damaged equipment? A friend lived in a building when the city crew working on a transformer put 440 on the line. It blew out all the electronics in 12 condos - mostly TVs. I think toasters and refrigerators were OK. There wasn't any question that the city was at fault. I don't remember how much paperwork they had to go through to get reimbursed. It might get sticky for something like a time-nut with a lot of used gear that may not be easy to replace at the original price. (Could be a good excuse to clean up and start over.) How much trouble do hams have with their insurance companies? -- These are my opinions. I hate spam. ___ 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] How can I measure GPS Antenna quality?
Mark, Was that screen invoked from the LH application or via command line? I don't see a mention of something similar on the LH help pop-up. 73/jeff/ac0c www.ac0c.com alpha-charlie-zero-charlie -Original Message- From: Mark Sims Sent: Tuesday, November 22, 2016 12:13 PM To: time-nuts@febo.com Subject: [time-nuts] How can I measure GPS Antenna quality? Attached is a screen shot from Lady Heather showing various antenna signal displays. The antenna was a cheap GPS/GLONASS patch antenna (mounted on a 3 foot ground level tripod ) connected to a rather nice NVS-08 receiver tracking GPS, SBAS, and GLONASS satellites (typically around 22 sats). The signal strength vs elevation mask plot shows a typical antenna characteristic where the signal strength drops off rapidly as the satellite elevation angle decreases. The yellow marker tick is where the signal strength is 80% of the peak strength. Swapping antennas can cause this angle to change by up to 15 degrees. When Heather does an "autotune" function, it uses this angle to decide where to set the antenna elevation mask angle. The relative signal strength vs azimuth plot can be a bit deceiving... it shows great signal strength to the north, but this is mainly due to the fact that the only times sats are visible there is when they are at high elevation angles. Weighting the signal strengths by 1/ELevation angle does a better job of showing signal obstructions... There is a two-strory house 25 feet to the west of the antenna. The signal level vs az/el map gives the best information on the antenna sky view characteristics... My best view is to the south east. Lots of trees to the north, house to the west, lots of other ground level obstructions everywhere. ___ 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] Nortel GPS hard to hold lock reciently
I have a Nortel/Trimble GPSDO which has been holding lock for the last month – at least it’s been in lock whenever I have thought to check it. But it seems like for the last several days LH has been indicating “RECOVERY MODE” or “OCXO COMP” instead of PHASE LOCKED. Appreciate any suggestions. I really don’t know what I’m looking at with the LH screen so the reason for this is likely literally in front of my eyes but I just don’t know enough to interpret what I’m seeing. 73/jeff/ac0c www.ac0c.com alpha-charlie-zero-charlie ___ 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] Ovenaire OSC 49-56b OCXO
Looking for data on this OCXO. No other markings than “Precision Crystal Oscillator” and the serial. If you have anything, appreciate it. Thanks. 73/jeff/ac0c www.ac0c.com alpha-charlie-zero-charlie ___ 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] Anybody want a Thunderbolt power supply?
I bought a module off ebay for a project recently. It has a LM317/LM337 pair, small heat sinks, regulator, bypass caps, rectifiers and filtering caps all on one board for about $10 delivered. To this you add a small transformer and piggy-back a 7805T/heat sink and that would give the 3 voltages required by this unit. Of course it's linear so it's got the linear heat dissipation issue but by the right pick of transformer that could be as low as about 3W (around 2KWH per month). Then again, it's also got the linear noise "problems" which are pretty much zero. 73/jeff/ac0c www.ac0c.com alpha-charlie-zero-charlie -Original Message- From: Bob kb8tq Sent: Wednesday, August 31, 2016 7:49 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Anybody want a Thunderbolt power supply? Hi It is not that hard to do. Use a linear rather than a switching approach. Run the +12 and +5 supplies off of LT1764 regulators. The -12 is very low current, run it off of a low noise op amp. There are lots of toroidal line transformers that will drive something like this. Bob On Aug 31, 2016, at 6:20 PM, Cube Central wrote: Wow, given all the responses about the cleanliness of the power into a Thunderbolt, I would be even more interested in a power supply that did *not* leave the "last mile" up to me. I would be more interested in a "pretty clean" power supply that I could just plug in and go. Any thoughts of me actually wiring the last bit of it make me break out in a cold sweat and come face to face with my (established, and sadly slow-to-expand) limitations. Maybe I'm the only one that would be interested in such a solution? I hope not, but I can see that there is a lot to consider about such a thing. Cheers! -Randal (at CubeCentral) -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob Stewart Sent: Wednesday, 31 August, 2016 15:29 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Anybody want a Thunderbolt power supply? OTOH, how many time-nuts have any interest in paying for a power supply that's up to time-nuts standards? It's really not easy to bring a small product to market at a small price. Even if you completely discount the personal effort of design, construction, and marketing, there's the issue of packaging. Without a package, it's just an amateur effort not worth considering. With a package, such as a Hammond box, the price moves into new territory and nobody's interested. Bob From: Charles Steinmetz To: time-nuts@febo.com Sent: Wednesday, August 31, 2016 4:24 PM Subject: Re: [time-nuts] Anybody want a Thunderbolt power supply? Mark wrote: Some times a full linear supply is not a viable option due to power dissipation/size issues or the utter convenience of using a switching wall wart. In the context of the present discussion -- powering a Tbolt for time-nuts use -- the first consideration would just be laughable and the second would be nothing but terminal laziness. Best regards, Charles ___ 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. ___ 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] Lady Heather Data Explained?
I appreciate Richard's query also. Not sure what I'm looking at on my screen either. Fantastic eye candy! I assume that seeing "discipline OK" and "phase locked" is likely a very good thing and in the first order approximation, that means things are as they should be. 73/jeff/ac0c www.ac0c.com alpha-charlie-zero-charlie -Original Message- From: William H. Fite Sent: Wednesday, August 17, 2016 2:20 PM To: Discussion of precise time and frequency measurement Subject: [time-nuts] Lady Heather Data Explained? The phrase, "ill documented' comes to mind. It is a wonderful piece of software but opaque and intimidating to the newbie. On Wednesday, August 17, 2016, Richard Mogford > wrote: Does anyone have a description of the various types of data on the Lady Heather user interface? I can figure out some of it, but still have some questions. For example, what are the data being graphed on the moving time chart? Richard ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/m ailman/listinfo/time-nuts and follow the instructions there. -- If you gaze long enough into the abyss, your coffee will get cold. ___ 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] WTB: HP 5334a or 5334b
If you have a unit in good condition, excess to your needs, kindly contact me off list please. 73/jeff/ac0c www.ac0c.com alpha-charlie-zero-charlie ___ 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.
