[time-nuts] Source of Maxim/Dallas DS1620 rev D chips (was High resolution temperatur sensor ?)
Le 29/08/2010 13:21, Peter Krengel wrote: Hi group watching tbolts disciplining it shows that is has a low resolution temperatur sensor only which can be replaced by a high res. one. Is there any document what typ it is and how to change it? Thank you regards Peter, DG4EK Peter, If the 'bay is your thing, go for item #110577237095. I bought a couple from this French seller and they are rev D which unlike rev E are supposed to work in the thunderbolt. That's because dallas/maxim changed protocols for high resolution temperature readings while the thunderbolt firmware was not updated. I haven't gotten around to do the mod yet but it should be simple enough. The seller wrapped them in alu foil plus some foam and cardboard. Good luck, -- Sylvain RICHARD ___ 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] LPRO and switching power supply?
Daniel Schultz a écrit : > What type of power supply are you using to provide the 24 volts to the LPRO? > The Users Guide mentions (on page 23) that there is a susceptibility to input > noise and suggests that users not connect fans to the same power supply, but > it does not give any quantitative data, except for mentioning that "This topic > is discussed further in the LPRO Data Manual" which I cannot find. > > Have you had success running the LPRO from a switch mode power supply? > > Dan Schultz N8FGV > Dan, I have no experience with the LPRO, but you may find the results of connecting various power supplies to a Thunderbolt interesting: http://www.leapsecond.com/pages/tbolt/noise.htm You may already have seen that page, but it's an eye-opener. Especially when you can't measure phase noise yourself. -- Sylvain RICHARD ___ 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] Different Thunderbolt versions
Markus Kern wrote: > Hello everyone, > Hi, > I am new to the list and currently looking for a timing standard for a > VLBI application. After some searching I have decided to use two > thunderbolts for a first attempt and now have some questions regarding > the different available versions. > > There seem to be two types of Thunderbolts available on eBay right now. > One is the "flat" board mount version without PSU and which requires > a (+12V, -12V, +5V) power supply. The other is the "boxed" version > with integrated PSU and which requires 24V. These are all old > Thunderbolts with 8 channel GPS. The new Thunderbolt E with 12 > channels obviously doesn't show up on eBay yet. (See [1] for > comparison) > > My first question concerns the power supply. [2] shows that the output > phase noise is significantly dependent on the PSU. How does the > integrated PSU of the boxed version compare to the PSUs tested in [2]? > Is it worth getting the boxed (somewhat more expensive on eBay) version > just for the PSU? > I believe that the blue trace (#3) on the last figure from John Miles' page [3] is with the integrated 24 to -12, +12, +5 V PSU. So you are better off buying a cheap barebones Thunderbolt and a cheap linear PSU. > My second question is about the Thunderbolt's OCXO. [3] shows how to > replace the built in OCXO with a more stable one and suggest that not > all Thunderbolts have the same OCXOs. The bad OCXO in [3] appears to > be from PIEZO and has S/N 1384. The better Thunderbolts apparently > have "10811-class" OCXOs (like the replacement). Neither, > unfortunately, match the labeling of the OCXOs seen on eBay (e.g. [4]). > Is there an easy way to distinguish these different Thunderbolts? > > Thanks, > Markus > > [1] http://www.febo.com/pipermail/time-nuts/2008-May/031370.html > [2] http://www.leapsecond.com/pages/tbolt/noise.htm > [3] http://www.thegleam.com/ke5fx/tbolt.htm > [4] > http://cgi.ebay.de/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MEWAX:IT&item=170300146215 > > Good luck, -- Sylvain RICHARD ___ 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 3320B manual
Jim Palfreyman wrote: Best guess: torrent site / forum user habit? http://en.wikipedia.org/wiki/HTTP_referrer Sylvain RICHARD I meant: Why hide the http? 2009/5/28 Jim Palfreyman I'm curious - why change hide the http? 2009/5/28 Stanley Reynolds PDF here : hxxp://www.hparchive.com/Manuals/HP-3320AB-Manual.pdf (change xx to tt). Stanley ___ 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 5370B ROM images - success
Mike S a écrit : Just a quick report. The 5370B ROM image seems to work just fine in a 5370A. At least one GPIB sequence which would cause the original firmware to hang now seems to work fine. I put up a page describing how to change to the newer firmware, based mostly upon an earlier post by Mark Sims: http://www.flatsurface.com/5370A/index.html Hi, I've archived this page just in case. What exactly was fixed by using the newer firmware? Random hangs or specific bugs? Regards, -- Sylvain RICHARD ___ 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] Question about KE5FX Tools -> PhaseNoise Tool
Le 16/10/2011 18:20, Peter Krengel a ecrit : As expected I got a horizontal line at -127dBm from 10-100Hz. Unexpectedly level changed from 100-200Hz as a falling curve down to -132dBm and went on horizontaly further at this level to 1kHz. During the measurement I observed the instrument and saw that it switched from RBW 10Hz to 100Hz so that I guess thats the reason for the descending level between 100 and 200Hz f-offset. So the observed effect seems to be a property of the Anritsu instrument. Similar happened between 1-10kHz and so on. My question: How can I adjust that offset to get a smooth measuring result? Peter, This is known to happen. Here's a link [1] to an Agilent FAQ regarding the HP7 series modular spectrum analyzers. It's an interesting case because you get different behavior (noise increases or decreases) depending of the combination of RF/IF sections you choose. Time to review the Friis formula [2]. Have fun, Sylvain [1] [1]Agilent FAQ : Why does the noise floor rise when changing RBW from 300 kHz to 100 kHz in a 71210C Spectrum Analyzer? If the link is broken, go to agilent.com, copy and paste "DANL comparison" with the quotes in the search box, select "Electronic Test and Measurement" and the site will offer the FAQ as "71210C: DANL comparison to 71200C". [2] [2]Wikipedia: Friis formulas for noise -- Sylvain RICHARD References 1. http://www.home.agilent.com/agilent/editorial.jspx?cc=US&lc=eng&ckey=103230:epsg:faq&nid=-11143.0.00&id=103230:epsg:faq&pselect=SR.GENERAL 2. http://en.wikipedia.org/wiki/Friis_formulas_for_noise ___ 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] HP10811-60111 oven failure + repair
Achim Vollhardt wrote:: Fellow time-nuts, my humble HP10811 + Shera controller combo signaled loss of lock since about a week after 5 years of non-stop operation. Frequency measurement showed it to be ca. 90 Hz low and the added oscillator enclosure (8mm aluminum case) barely exceeded room temperature. Measurement showed oven current to be zero and after some Google research, the thermal fuse for the oven controller became the prime suspect. Opening the oscillator is rather easy due to screws, pulling the inner isolation lid as well. With help of the service manual, the fuse is quickly identified and proved indeed to be open. I had a 24V, 1.5A polyfuse at hand which was soldered in parallel to the existing fuse. 1.5A seems a bit large, however I think some derating is advantageous due to the elevated temperatures. Closed everything and first connected the oven supply only: Regards, Achim Achim, You're not the first with this problem. Search the archives for tons of conflicting advice: http://www.google.com/search?btnG=1&pws=0&q=site%3Awww.febo.com+%22thermal+fuse%22 -- Sylvain RICHARD ___ 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] Noise source measurement
Le 22/10/2011 14:50, Javier Herrero a écrit : Hello all, Perhaps a bit OT, but I'm measuring the output noise density of a noise source at a puntual frequency. I've fed the noise output to a 8566B spectrum analyzer, BW set to 1MHz and video BW set to 1kHz so the displayed trace is flat. I obtain a measurement of -45dBm, and I understand that the noise density then is -105dBm/Hz. From design variables, I was expecting a somewhat lower value, around -110dBm/Hz, but between the NoiseCom noise source and the output there are several things (attenuator, filter, amplifier, directional coupler, variable attenuator, ...), so perhaps there are slight differences between estimated insertion gains and losses accumulate up to 5dB. Before dismount the system and look directly at the noise source output and measure the losses/gains of each element, I would like to know if I am doing this mesasurement right or am I commiting some mistake? Thanks! Best regards, Javier, EA1CRB Javier, Short answer: 1) make sure that the noise level increases at least 10 dB when you connect the noise source. 2) check that there is no hidden compression by manually controlling the input attenuator and (not sure if this works on a 8566B) the IF amps / reference level. Levels should remain constant. Don't fry your input mixer: -10 dBm max for specified linearity. Total power in your case = -105 dBm/Hz in many gigahertz plus (unknown) amplification. 3) use the noise marker (shift+M) to take care of the well-known ~2 dB difference between proper power detection and what the analyzer does. Long answer: Agilent appnote 1303, aka 5966-4008E "Spectrum and Signal Analyzer Measurements and Noise" http://cp.literature.agilent.com/litweb/pdf/5966-4008E.pdf Have fun! -- Sylvain RICHARD ___ 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] OT: In search of strange transistor data
Ulrich Bangert wrote: Fellow time nuts, does anyone of you have available the specs of one of the the following transistors? 1) PT5744 2) ENI5744 3) TRW201 The usual searching methods do not apply. Must be something extraordinary. TIA and my best regards. Ulrich Bangert Hi, TRW201 is in my database. Three different packages. Motorola Silicon NPN-transistor Flat package Package:B Wide lead: E Thin lead: C VCES 50V VEB0 3.5V IC 3A Rth J-C 3.5 °C/W TJ 200 °C hFE min 10 @ 5V 600mA hFE max 100 @ 5V 600mA CCB0 <21 pF @ VCB 28V Good luck, -- Sylvain RICHARD ___ 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] OT: In search of strange transistor data
Le 28/10/2011 17:24, Sylvain RICHARD a écrit : Ulrich Bangert wrote: Fellow time nuts, does anyone of you have available the specs of one of the the following transistors? 1) PT5744 2) ENI5744 3) TRW201 The usual searching methods do not apply. Must be something extraordinary. TIA and my best regards. Ulrich Bangert Hi, TRW201 is in my database. Three different packages. Motorola Silicon NPN-transistor Flat package Package:B Wide lead: E Thin lead: C VCES 50V VEB0 3.5V IC 3A Rth J-C 3.5 °C/W TJ 200 °C hFE min 10 @ 5V 600mA hFE max 100 @ 5V 600mA CCB0 <21 pF @ VCB 28V Good luck, Scratch that. That was for TRW2010 not 201. -- Sylvain RICHARD ___ 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] 2004 & 2005 Tbolts w. the bad temp chip
Le 12/02/2012 19:58, cfo wrote: I recently got 2 tbolts , and i'm quite sure they have the "bad" temperature chip. They say mfg date : 2004 and 2005 in heather I have a 2003 Tbolt , that shows and updates the temperature constantly. And the "yellow temp graph" is "natural". The 2004& 2005's does rarely update , and the graph jumps 4 x 250mC , in one jump like a Schmitt-Trigger. I'm quite sure i read that someone here on the list had a "reel" of the old good sensors , but i can't seem to find the posting. Any hints CFO time-nut beginner Denmark CFO, Googling "DS1620 site:febo.com" should give you the relevant details. And I bought some chips from French eBay seller philing2003. His chips are rev D1 and work fine. Rev E chips produce staircase-looking curves because Maxim changed the high-res temperature protocol while Trimble didn't adapt. http://cgi.ebay.com/110823352054 Good night, -- Sylvain RICHARD ___ 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] AVR Oscilloscope clock
Magnus Danielson wrote: > A friend passed me the link to it, I got one, tossed it together, and it works > nicely. > > http://dutchtronix.com/ScopeClock.htm > > It has PPS input and NMEA parsing seems to be down the line. > > The site only mentions Intel Hex. Are the sources available? Happy holidays S. RICHARD ___ 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] How much for an HP58503A?
Dear fellow nuts, Do you have an idea of the current market value of a 58503A? Best regards, S. Richard ___ 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 much for an HP58503A?
Sylvain RICHARD wrote: > Dear fellow nuts, > > Do you have an idea of the current market value of a 58503A? > > I forgot to mention that I am a prospective buyer. And the seller is not on this list ( yet ;-) ). Please don't chicken out, guesstimates are welcome. > Best regards, > > S. Richard > > ___ > 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] Clock Powers of Ten
Tom Van Baak wrote: > There are good clocks and bad clocks. Most need power, one > needs food, another runs all by itself. > > Take a trip across 15 orders of magnitude of clock performance: > > http://www.leapsecond.com/ten/ > > /tvb > I must say the drip clock was very nice. Re the mains frequency, I believe it changes with the load on the grid. Do you have a record of this? Sylvain ___ 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] Clock Powers of Ten
michael taylor a écrit :
On Jan 31, 2008 5:27 PM, Sylvain RICHARD [1]<[EMAIL PROTECTED]> wrote:
Re the mains frequency, I believe it changes with the load on the grid.
Do you have a record of this?
I forget the reasoning for frequency variation, but it is load or
source related I believe. Part of the reason it
It is a balance between production and grid load. In the European case,
the grids are phase synchronous over several countries. The (oldish)
data I have is
- Nordel : Finland, Norway, Sweden, Denmark
- Uktsoa : UK.
- Atsoi : Irland
- Ucte : everybody else in Western Europe : Portugal, Spain, France,
Netherlands, Belgium, Luxembourg, Germany, Switzerland, Austria, Italy,
Czech Republic, Slovakia, Poland, Hungary, Romania, ex-Yougoslavia
During the 2006 blackout, the frequency went down by several hertz
before some customers were disconnected ("load shedding"). The so
familiar 50Hz line on VLF spectrograms took a dip.
A project for a easy to build AC frequency measuring device:
[2]<http://www.sparetimegizmos.com/Hardware/AC_Monitor.htm>
I could log the frequency deviations from my local AC mains if you
want some sample data.
This gadget looks nice, but I think I'll pass.
Good night
Sylvain
References
1. mailto:[EMAIL PROTECTED]
2. http://www.sparetimegizmos.com/Hardware/AC_Monitor.htm
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Re: [time-nuts] No Echo
Neville Michie wrote: > Sorry for the double mailing, > I find it very disconcerting to not have my contributions sent back > to me. > I mail a response, but it seems not to have been sent, or there is a > big delay. > When I go to the archives I find it was sent but I did not get a copy. > Even when I list myself under Cc. > cheers, Neville Michie > I suggest you read the headers of the messages you receive from the list. You seem to be using Apple Mail, so I cannot give precise instructions. Best regards Sylvain RICHARD ___ 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] HP58450A
Dear all, Do you have any pointers on the 58450A. It looks thunderbolt-ish, that is to say is is a small form factor metal enclosure with a gps input, 1pps 10MHz outputs and a serial port. Have a good day Sylvain RICHARD ___ 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 Echo
Robert Vassar wrote: > In Apple Mail use "View -> Message -> Long Headers". > Thanks for the heads up. Here is the result for Robert's message: Received: (qmail 816 invoked from network); 22 Feb 2008 22:43:10 - Received: from 24.123.66.139 (HELO febo.com) (24.123.66.139) by mrelay3-1.free.fr with SMTP; 22 Feb 2008 22:43:10 - Received: from localhost ([127.0.0.1] helo=febo.com ident=foobar) by febo.com with esmtp (Exim 4.68) (envelope-from <[EMAIL PROTECTED]>) id 1JSgaj-rK-RH; Fri, 22 Feb 2008 17:42:05 -0500 Received: from linode.rob-vassar.com ([69.56.173.58] helo=mailhost.rob-vassar.com) by febo.com with esmtp (Exim 4.68) (envelope-from <[EMAIL PROTECTED]>) id 1JSgaV-r8-KB for time-nuts@febo.com; Fri, 22 Feb 2008 17:42:02 -0500 Received: from [10.1.1.13] (adsl-71-145-128-63.dsl.austtx.sbcglobal.net [71.145.128.63]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) by mailhost.rob-vassar.com (Postfix) with ESMTP id 8F58550297 for ; Fri, 22 Feb 2008 16:41:50 -0600 (CST) In my case, most of the delay comes from my ISP (free.fr). Neville, just do the same on your machine. Please note that the usual caveat (is your server time set correctly?) does not apply our case. Best regards Sylvain RICHARD ___ 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] Thunderbolt Group Buy, part 1
Tom Van Baak wrote: > > 2) Those of you newcomers to Time-Nuts should expect >to wait until the first batch has been shipped and >TAPR is ready for you. There should be enough for >everyone; so don't panic. > I won't panic, but I'd reaaally like one. I'm already expecting one from Aibin Guo. Sylvain RICHARD Paris, France ___ 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] Thunderbolt meets ntpd
Chris Kuethe wrote: On Sun, Jun 22, 2008 at 11:30 PM, Hal Murray [1]<[EMAIL PROTECTED]> wrote: Does anybody have any Linux code to print the stuff it's sending? If not, I'll probably have something soon. 1) dig around on trimble.com - there's a link to iQSource.zip which may be useful Do you mean [2]ftp://ftp.trimble.com/pub/sct/embedded/bin/iQ/TOOLS/ ? Sylvain RICHARD References 1. mailto:[EMAIL PROTECTED] 2. ftp://ftp.trimble.com/pub/sct/embedded/bin/iQ/TOOLS/ ___ 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.
