Re: [time-nuts] Galileo

Hello, Martyn. Thursday, October 22, 2009, 0:28:47, you wrote: M> Does anyone know of Galileo GPS receivers or dual receivers? If memory serves me correctly, all uBlox 5 based GPS modules with flash memory advertised as Galileo-ready (assumed that you must flash new firmware once system is opera

Re: [time-nuts] Vremya-ch Hydrogen Masers

Hello, J> Anyone here have any experience with these masers? J> In particular the VCH-1005A? J> I have been tasked to look after a number of these units and am currently J> going through the manuals (which are in English but written by a Russian, so J> they can be challenging :-) Do you have or

Re: [time-nuts] gravimeters

Hello, Saturday, December 13, 2008, 1:40:47, Neville Michie wrote: N> The problem with helium is that it comes out of oil wells. N> It does not cost much because they were digging up the oil anyway. N> If what they say about peak oil is true, in 30 years or so there will N> be no N> more helium a

[time-nuts] RF transformers for distribution amplifier

Hello, Just digged in my junkbox(es) in hope to find something to quickly build distribution amp for Rb module that I just received from fluke.l. Figured out that I'm pretty short in fast opamps, but found considerable quantity of Mini-Circuits TC1-6-75-1 SMT wideband transformers (same as sold no

Re: [time-nuts] He is a Time-Nut Troublemaker....

Hello, Tuesday, December 23, 2008, 2:37:46, Neon John wrote: N> since we have so many shooting time nuts here, I thought that y'all would N> enjoy this page: N> http://www.neon-john.com/Misc/Antique_Chrono.htm Fun thing... I seen similar decade modules in some russian counters dated early 50's.

Re: [time-nuts] Agilent 53132A Needs Help

Hello, Tuesday, January 20, 2009, 17:26:00, Richard M. Hambly wrote: R> One of my 53132As, an Agilent unit, s/n KR01202209 fail the power-on self R> test with a FAIL:ROM error message. Cannot say anything about your particular counter, but very often such error is due to 'leaked' EPROM chip, tha

Re: [time-nuts] Upgrade for LPRO 10 MHz Oscillator?

Helloъ Sunday, January 25, 2009, 23:05:01, Bruce Hunter wrote: B> Has anyone upgraded the LPRO oscillator by out-boarding a suitable OCXO unit? Why not just lock external oscillator to LPRO output with long enough time constant? Is there any real difference? -- Best regards, Yuri

Re: [time-nuts] Agilent 53132A Needs Help

Hello, Monday, January 26, 2009, 14:14:54, David wrote: D> I think I've seen seven Agilent 54132A counters and three of units flagged a D> ROM fault after Power On Self Test. They had all been well looked after, D> sitting in racks in a very high end environment, I suspect they were D> switched o

Re: [time-nuts] Replacement High-Speed AOP for Distribution Amplifier

Hello, Monday, April 6, 2009, 17:59:49, Samuel D. wrote: S> Hi there, S> I'm working on a new GPS-Disciplined Rubidium Frequency Standard and I'm now S> designing the distribution amplifier stage. There is many schematics S> everywhere on the Internet, the most famous is the TADD-1 reviewed by t

Re: [time-nuts] Efratom FRS 10mhz rubidium frequency oscillator+ board

Hello, Sunday, May 31, 2009, 19:29:23, GandalfG8 wrote: G> Bob, Fluke.1, is selling these on Ebay, for example item # 290313671907, G> and supplies the FRS module itself with an interface board containing the G> FRS connector, plus another PCB containing a 15MHz oscillator and assorted G> oth

Re: [time-nuts] Multiple Voltage monitoring

Hello, Friday, July 31, 2009, 8:00:51, Matt Ettus wrote: M> Does anyone have a good solution for monitoring 4-8 different voltages M> at the same time? I only need a sample rate around 1-2 Hz, but would M> need GPIB, serial, or ethernet support with protocol documentation. M> Any help identifyi

[time-nuts] Galvanic decoupling of GPS antenna

Hello, I'm trying to put gps (for a coarse timing sync and RTC auto-setting) to a small controller that must be completely galvanically decoupled from outside world. Antenna power must be supplied from separate power source (ground potential of isolated part of circuit can slowly float up to +/- 2

Re: [time-nuts] Galvanic decoupling of GPS antenna

Hello, Thursday, June 17, 2010, 2:44:43, Didier Juges wrote: D> It is not clear to me why the antenna should be isolated from the D> receiver, I would prefer to keep the antenna and receiver on the D> same return, and isolate that assembly from the rest of the world. D> It is much easier to prov

[time-nuts] Looking for Kyoritsu EF-511 camera shutter tester manual (also some sort of time-measuring device ; ))

Hello, I'm trying to find user (or, better, service) manual for older (mid-80's) Kyoritsu EF-511 camera shutter tester. As I can see, it contain calibrated light source, external photosensor to mount on a film frame of camera under test, and some sort of time intervals meter built in. Maybe also l

[time-nuts] Rb lamp lifetime...

Hello, Readed list archives and googled a lot, and seen two opposing points of view - one is that there is nothing to age in Rb lamp, another is that Rb lamp is degrading when in operation (without details, how and why). I'm planning to get some Efratom Rb oscillator to use it in a constantly run

Re: [time-nuts] Rb lamp lifetime...

Hello, Sunday, November 2, 2008, 6:31:32, WB6BNQ wrote: W> Hi Yuri, W> Unless you need the longer term stability of an undisciplined Rb source, I think W> you would be better served to get one of the “Timenuts group” Trimble Thunderbolt W> GPS units to use as a home standard. It is available

Re: [time-nuts] Finding a good antenna location?

Hello, Alan. Friday, November 21, 2008, 18:11:47, you wrote: A> I recently picked up a Thunderbolt on eBay. For the present, I will be A> using it with the antenna inside, and have been experimenting with various A> window locations for the best signals. Even small changes in position make A> a

Re: [time-nuts] GPS Valid Fix Detector

Hello, Monday, November 24, 2008, 1:08:45, Peter Putnam wrote: P> Greetings, P> For those interested in a very simple means of determining if the NMEA P> data stream from a GPS receiver contains valid fix data, I offer P> design details for a "Valid Fix" detector that runs in a Microchip P> 12F6

Re: [time-nuts] Oncore question

Hello, Monday, November 24, 2008, 0:02:27, Arnold Tibus wrote: A> You describe that using LiIon batteries are not yet the ideal way, but why A> cannot higher capacities come into play (space should be not the problem A> for on ground use in fix stations)? I simply put large rechargeable Lithium-

Re: [time-nuts] Oncore question

Hello, Tuesday, November 25, 2008, 0:36:20, Morris Odell wrote: M> In the meantime the discussion prompted a baord redesign to find some M> real estate for a Li cell :-) Not necessarily... You can always get (or make) batery holder with wires and affix it with piece of adhesive foam or velcro to

Re: [time-nuts] Eclipses and atomic clocks

Hello, Tuesday, November 25, 2008, 21:39:41, Bill Hawkins wrote: B> There is an article in the Nov 22, 2008, issue of Science News B> (www.sciencenews.org) about variations in the decay rate of B> radioactive atoms. The title is "Half-life (More or Less)" B> where "more or less" is an idiom for

Re: [time-nuts] Eclipses and atomic clocks

Hello, Saturday, November 29, 2008, 0:16:28, John Miles wrote: J> I'm sure there's a more appropriate list for this bogosity. There is list of facts on page 4 and related references that saved me some time searching them all... ;) The rest... I do not pretend that the rest it is somewhat related

[time-nuts] "Foolproof" cleanup PLL design for FRS-C Rb module

Hello, Recently, I looked for some birthday gift for a friend of mine (a guy who is interested in SHF and weak-signal comms). Ocassionally I found my extra FRS-C with connector and decided that it is good gift idea. It was my mistake. ;) Since then he constantly asking quite advanced questions ab

Re: [time-nuts] Russian GPSDO

Hello, Tuesday, October 18, 2011, 12:01:46, Attila Kinali wrote: A> On Mon, 17 Oct 2011 08:53:51 -0700 A> "WarrenS" wrote: >> So where do I get a cheap, used Russian GPSDO? >> I have not seen any on EBay >> Can I trade them my Tbolt? :) A> uBlox offers GLONASS ready modules for a few months.

Re: [time-nuts] Russian GPSDO

Hello, Wednesday, October 19, 2011, 1:21:31, Tom Van Baak wrote: T> So the antenna and receiver architecture is more complicated. Have you seen any T> portable car navigation or cell phones with GLONASS? Smartphone with both nav systems (sorry, Russian page only): http://www.shop.mts.ru/phones

Re: [time-nuts] Russian GPSDO

Hello, Wednesday, October 19, 2011, 10:04:06, Mike Cook wrote: m> and on the bay of course. see for example 150659387614, again a Russian m> product which even flags the sats with the national flag. Navigation m> only, but a nut might want to poke probes into it. Russian design based on one of

[time-nuts] MC145151-2 in a Rb cleanup PLL

Hello, Just found a dozen of older MC145151P2 parallel load PLL chips in junkbox. Looks quite interesting, and may allow to lock, say, 50 MHz VCOCXO to 10MHz Rb output without too much extra parts. Does anyone tried to use this (or similar) chips in a cleanup PLL for Rb oscillator module? -- B

Re: [time-nuts] Hydrogen Maser KIT! Update #1

Hello, Monday, November 3, 2014, 5:40:30, Chuck Harris wrote: C> I would think that making the teflon coating would be pretty easy. C> What I would try is to put a nichrome boat, and some teflon into the C> vessel, and pull it down to a good vacuum. Then heat up the boat, C> and the teflon shou

Re: [time-nuts] Cheap 5370A on eBay

Hello, Friday, December 19, 2014, 21:34:35, Poul-Henning Kamp wrote: PH> PH> In message <766218c3-5ac3-4189-899b-916858f1f...@n1k.org>, Bob Camp writes: >>A *lot* of errors on the 5370’s (A or B) can be traced to a couple PH> of fairly simple issues: PH> 4) (E)PROMS loosing their memor

[time-nuts] Output MMIC in Lucent Rb units....

Hello, Does anyone know model of MMIC that is used in output stage of 15 MHz amplifier chain in Lucent Rb units? It is pretty large ceramic case with gold plated covers. For example, it is U4 on a following board photo. http://www.makarov.ca/images/rubidium/Lucent%20011.jpg The same MMIC was se

[time-nuts] "Chinese" MV89A OCXO oven oscillation

Hello, Does anyone have any experience in fixing MV89A's that have oven oscillation after warm-up (current consumption fluctuate with a 0.8-0.9 sec period from almost zero to approx 0.7A)? While cold, OCXO drawing about 0.96A and there is no fluctuations. During warm-up current drops, and somewhe

Re: [time-nuts] Rb standard questions

Hello, Tuesday, July 30, 2013, 3:03:57, Bob Camp wrote: >> 3) what is the typical life of such a unit? B> If it's run without a heat sink, about two years. B> If it's power off on the shelf, many decades. There was another "aging factor" mentioned in some documents that circulate around the n

Re: [time-nuts] Rb standard questions

___ 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] Rb standard questions

Hello, Tuesday, August 13, 2013, 0:08:01, paul swed wrote: >What are the two lamp voltages? >You may be in the middle part of the life curve. >Regards >Paul >WB8TSL 8.34 V back in tne 2008. 8.26 V in the beginning of 2013 (after few hours of operation, started after long inactivity with lamp

Re: [time-nuts] Datum GPS Receiver 9390-5537 found

Hello, Friday, March 24, 2017, 19:09:14, Heinz Breuer wrote: H> Google directed me to website in Russia for a download but a H> window popped up asking me to enter my phone number. This was H> suspicious and I left immediately. Usually it may be translated as "some server in .ru domain located o

[time-nuts] Interfacing of 74ALVC divider chain to ADF4350 output (yet another low jitter sine-to-logic thread ; ) )

Hello, Trying to make low-PN fine tuning step synth for experiments in HF range from the parts I have on hand. Looks like the best I can do is to add extra dividers to chinese ADF4350 board from eBay that was used in the past and now is collecting dust on the shelf. But interfacing of 74ALVC flip

Re: [time-nuts] Interfacing of 74ALVC divider chain to ADF4350 output (yet another low jitter sine-to-logic thread ; ) )

Hello, Thank you for your reply! Monday, July 31, 2017, 0:25:19, Attila Kinali wrote: A> Alternatively, use something like an SY89874 as first divider A> stage to get down to a more managable frequency range, then A> continue with your ALVC dividers. I think it will be easier (faster and cheape