[time-nuts] In praise of service: PTF

Let me praise the support provided by PTF (www.ptf-llc.com): I obtained a faulty GPS time clock off ebay to replace the one that was burned by a lightning strike on the house. First, the manual is online. Second, the support emails provided by PTF (probably by the owner) allowed me to diagnose

[time-nuts] Buying a pig in a poke - Zyfer NTP box receiver problems

So. There was this nice Zyfer NTP box on the usual auction site. I powered it up whereupon it reported a fault on the ethernet board. I decided to contact the source and after a while, the Zyfer support staff responded and told me that the box was de-mil'ed by the buyer and I was missing the

Re: [time-nuts] Time nut soon to be in Shenzhen

I think you need "The Essential Guide to Electronics in Shenzhen" by Bunnie Huang. On Sun, Nov 6, 2016 at 8:37 PM, Li Ang <379...@qq.com> wrote: > Hi >Welcome to Shenzhen. As far as I know there is no market that you can > see pile of OCXO. They were taken off from equipments, and the

Re: [time-nuts] Get together at IMS?

ic Engineers). > Good proposal to meet at the Industry reception on Wednesday. Please come > up with a proposal for the meeting point, as the hall is big. > Best regards > > Bernd DK1AG > > -Ursprüngliche Nachricht- > Von: time-nuts [mailto:time-nuts-boun...@f

[time-nuts] Get together at IMS?

Anyone else going to IMS in SFO this coming week? I would propose meeting during the "industry Reception" Wednesday afternoon... ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] Lightning 1, tbolt 0.

I had a lightning strike on our roof last year - blew slate tiles at least 15 meters away. Burnt out several ports on my ethernet switches. And also took out my Symmetricom TS2100 GPS clock in strange ways. If anyone wants a peculiar TS2100L then let me know! On Thu, Mar 31, 2016 at 9:13 AM,

[time-nuts] Spreadsheet from Ulrich Rohde's paper

If you don't have MathCAD but would like a parameter fed version in Python... Drop me a line and I'll send you my version. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and

Re: [time-nuts] MIT 2 inch cesium fountain, optically pumped

For those who are interested, a relevant dissertation can be found here: http://dspace.mit.edu/bitstream/handle/1721.1/71453/795174737.pdf Unfortunately, you can't print it, but you can read it. A rather complete discussion of the construction of the experimental apparatus is included. On

Re: [time-nuts] MIT 2 inch cesium fountain, optically pumped

, November 24, 2014 at 9:05 AM From: Mark Kahrs mark.ka...@gmail.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Subject: Re: [time-nuts] MIT 2 inch cesium fountain, optically pumped For those who are interested, a relevant dissertation can be found here: http

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

There's been a fair number of papers from Hahvahd about bulb coating for masers. Interestingly enough, here's a patent: http://www.google.com/patents/US3859119 from 1972. I had to figure this out, but Yuri is referring to flourophosgene a.k.a. carbonyl flouride. If you'd like to read a

[time-nuts] Unusual 10544A

Jerry Johnson has the following question: Some of the documents that I have found show pins and feed throughs with SMB right angle connectors for RF and probably control voltage. This one doesn't have the SMB connecgtor, just pins. The case says 10544A part number (which I've not

Re: [time-nuts] A small piece on HP's hydrogen maser in 1968

So what's all this about a Thallium Beam Tube??? (Isn't Thallium incredibly toxic?) n.b. One of the pictures references a Th beam tube... On Tue, Feb 25, 2014 at 2:46 AM, Poul-Henning Kamp p...@phk.freebsd.dkwrote: [Jim Lux] Wasn't that Gravity Probe B.. which finally launched in 2004,

Re: [time-nuts] A small piece on HP's hydrogen maser in 1968

Thanks, also consider the HP patent: http://www.google.com/patents/US3407295 On Tue, Feb 25, 2014 at 4:40 PM, Tom Van Baak t...@leapsecond.com wrote: So what's all this about a Thallium Beam Tube??? For info about the pro/con of Thallium beam frequency standards, see:

Re: [time-nuts] fast edge, rise time.

You might be interested to know this was discussed in a paper by Jim Andrews (founder of Picosecond Pulse Laboratories): http://www.nist.gov/calibrations/upload/im-25-4.pdf From the age of the paper, I'd say this generator is probably more than 40 years young. On Mon, Jan 13, 2014 at 2:22 PM,

[time-nuts] DARPA SBIR - Portable Microwave Cold Atomic Clock

SB141-004 TITLE: *Portable Microwave Cold Atomic Clock* TECHNOLOGY AREAS: Materials/Processes, Sensors, Electronics This topic is eligible for the DARPA Direct to Phase II Pilot Program. Please see section 4.0 of the DARPA instructions for additional information.

Re: [time-nuts] HP 4193A 4815A probe compatibility?

Except that if you blow the 54701A front-end, the IC is made of unobtanium. Likewise, buying an untested probe... As for the 4193A, if you know of an instrument without probe for $1, please let me know ASAP!!! The connector of the 4193A is the same awful connector as the 8411A so if you wanted

Re: [time-nuts] pin-wheel antenna

I'm surprised no one has mentioned the patent of interest: http://www.freepatentsonline.com/7250916.html An antenna is provided for acquiring RF signals from various satellite ranging systems including GPS, GLONASS, GALILEO and OmniSTAR®. The antenna configuration includes a radiating structure

Re: [time-nuts] PTTI 2012, part 2

I couldn't resist and did a little reading. So, the MIT Flea has MOT cells? That would seem to be the deal breaker to me. The rest is just plumbing. And smoke and mirrors. On Tue, Dec 4, 2012 at 8:23 PM, ewkeh...@aol.com wrote: In a message dated 12/4/2012 6:10:36 P.M. Eastern Standard

Re: [time-nuts] Loran

Very interesting topic. So, it appears that UrsaNav bought a pair of companies that have interesting IP. In particular, CrossRate has a few interesting patents -- this may be the most relevant: United States Patent Application 20080144744: A system for demodulation of the Loran Data Channel

Re: [time-nuts] Schematic capture, anyone?

I'll add my $0.01 (depreciated). I am working on a project with Eagle. I started with the Gnu cad stuff but like many free software projects, it has multiple user interfaces and clunks. I tired of it and switched to Eagle. Eagle also has quirks but has the ability to switch back and forth

[time-nuts] Norman Ramsey obit

http://www.nytimes.com/2011/11/07/us/norman-ramsey-dies-at-96-work-led-to-the-atomic-clock.html ___ 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

Re: [time-nuts] alkali metals and water

I have to say that youtoob has completely revitalized the teaching of chemistry (if only the teachers realize it). Videos just like that one have fascinated my offspring to the point I had to dig out my copy of the Rare earth handbook. Chemistry has a whole new allure... Mention alkalai metals

Re: [time-nuts] Calculate spectral content from a series of zero crossing time stamps?

The Goertzel algorithm is only useful when you want a few frequences (i.e., it evaluates specific frequencies on the unit circle). For general all purpose slicing and dicing, the FFT is what you want. See the ancient book by Rabiner for the details. On Tue, Feb 8, 2011 at 3:14 AM, Tijd Dingen

[time-nuts] Choice of MASER gas

John Miles brought up an interesting question that got lost in the discussion of high vacuum systems: what about the choice of gas? Besides H, there is a dual Xe/He system detailed in: http://www.cfa.harvard.edu/Walsworth/pdf/Bear%20thesis.pdf And, as mentioned before, Harvard has built Rb

Re: [time-nuts] homebrew H maser

The Hahvahd physics dept. has all number of interesting papers. For example there's Humphrey's dissertation:www.physics.harvard.edu/Thesespdfs/humphrey.pdf If you've ever wanted to make your own Rb cell, how about this one?cfa-www.harvard.edu/~dphil/work/coat.pdf

Re: [time-nuts] A philosophy of science view on the tight pll discussion

I for one, have grown tired of the ad-hominem anti-intellectual attacks. This is supposed to be about science and engineering, not words. Therefore, I'd like to see analysis. As Lord Kelvin put it: In physical science the first essential step in the direction of learning any subject is to find

Re: [time-nuts] Datum 2100L issues

for the 2100LD? On Thu, Oct 29, 2009 at 8:02 PM, Christopher Hoover c...@murgatroid.com wrote: Mark Kahrs wrote: I'm finally trying to get this epay 2100L time server to go.  First step was to talk to it, change the host number and then see what I had... It appears to me (or it, depending on who you

[time-nuts] Datum 2100L issues

I'm finally trying to get this epay 2100L time server to go. First step was to talk to it, change the host number and then see what I had... It appears to me (or it, depending on who you ask), that two satellites are in view, to wit: 26 ? sig 09 0.000 04 17.604 10 0.000 15 0.000

[time-nuts] HP 8660C-K10 phase modulation test set

Among my mistaken acquisitions over the past is a phase modulation test set for the 8660C (model 8660C-K10). I've put two pictures here: http://www.caip.rutgers.edu/~kahrs/ebay/8660C-K.1.JPG http://www.caip.rutgers.edu/~kahrs/ebay/8660C-K.2.JPG This looks like a type of phase noise test set:

Re: [time-nuts] HP 106B part no.

1854-0003: Material: Silicon NPN Pw = 800 mW Ft = 50 MHz Vceo = 28 V Package = TO-5 Hfe = 60/240 10 mA No JEDEC part number. On Sun, Aug 9, 2009 at 1:02 PM, Glenn Little WB4UIVglennmaill...@bellsouth.net wrote: 1854-0003 is a good part number. I have a few here that were removed from

[time-nuts] Stanford Telecom units

Before I put these on flea bay, I thought I'd see if there was any interest here. These are Stanford Telecom GPS units of some variety I believe: model 5440 coder / data demod and 5430 baseband coder (featuring I/Q input). I have no other information. If there's no interest, they go onto da bay.

Re: [time-nuts] Loran vets: http://www.loran-history.info/

That umich document has to be one of the more interesting historical tidbits... For those who are in doubt, it appears to be D. L. Mills bachelor's thesis (!). On Tue, Jun 10, 2008 at 10:02 PM, Poul-Henning Kamp [EMAIL PROTECTED] wrote: For those of you playing with Loran-C, I found this page

Re: [time-nuts] Neat toys on eBay for PN measurement

); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] Hey, why not buy a 11848A (160117841068) from the same seller? Only 2.6K$! Put that in your PN system... On 7/4/07, Richard (Rick) Karlquist [EMAIL PROTECTED] wrote: ); SAEximRunCond expanded to false Errors-To:

Re: [time-nuts] Government Liquidation

I bought from DRMS directly before they contracted to govliquidation and also from GL. I can say that it was smart of the govt. since they (GL) are getting a lot more for each lot. That being said, it's always been a case of caveat emptor. They have lots of interesting stuff that doesn't

[time-nuts] STEL boxes

I am going through my lab finally sorting things out. I have uncovered two STEL boxes I bought a while back. They are models 5430 and 5440. The 5430 is a baseband coder and the 5440 is a coder/data demodulator. Because of the labels (e.g. P(Y) clock, C/A clock, etc), I believe these to be GPS

[time-nuts] Abbreviated book review

I sent this last week but didn't see it, so I'll try again. I checked out a new book from my local physics library Frequency Standards by Riehle (who is a PTB guy). It is published by Wiley-VCH. Here's a table of contents: 1. Introduction 2. Basics of Freq. Stds 3. Characterization of

[time-nuts] New? book

I checked out a new book from my local physics library Frequency Standards by Riehle (who is a PTB guy). It is published by Wiley-VCH. Here's a table of contents: 1. Introduction 2. Basics of Freq. Stds 3. Characterization of Amplitude and Frequency Noise 4. Macroscope frequency references 5.