Re: [time-nuts] Trimble T-Bolt Order
Hi Dick, So far not yet received but the unit usually goes thru the custom office long process... Rgds Ernie. -Original Message- From: Richard W. Solomon <[EMAIL PROTECTED]> To: time-nuts@febo.com Sent: Tue, 4 Nov 2008 3:55 am Subject: [time-nuts] Trimble T-Bolt Order Have folks received their T-Bolts from the last batch via TAPR ? A friend ordered one the first day, got his confirmation and is still waiting. Thanks, Dick, W1KSZ ___ 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] Trimble T-Bolt Order
Got mine a couple of days ago. Thanks TAPR! I finally have a standard besides WWV. Mike - AA8K Richard W. Solomon wrote: > Have folks received their T-Bolts from the last batch via TAPR ? > > A friend ordered one the first day, got his confirmation and is still > waiting. > > Thanks, Dick, W1KSZ > ___ 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] Trimble T-Bolt Order
Have folks received their T-Bolts from the last batch via TAPR ? A friend ordered one the first day, got his confirmation and is still waiting. Thanks, Dick, W1KSZ ___ 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] Jackson Labs Fury & Isotemp OCXO134-10
> BTW, it would appear as though my HP 53131A counter reads 220 mHz low > with a 2 second gate time. There appears to be no appreciable drift; > it always reads 220 mHz low. I'm sure there is a name for that > measurement, I hope to learn it soon. Congratulations. You just measured the frequency of the crystal inside your 53131A. Stand on your head and it will make sense. If you feed an unknown signal in, you can measure its frequency. But that's only as accurate as the internal clock. If you know the frequency of the external signal more accurately than the internal clock you end up measuring the internal clock. -- These are my opinions, not necessarily my employer's. 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.
Re: [time-nuts] Jackson Labs Fury & Isotemp OCXO134-10
On Sun, 02 Nov 2008 01:28:34 -0500, Matt Osborn <[EMAIL PROTECTED]> wrote: Hi all, Thanks for all the help and ideas with the IsoTemp/Fury combination. I followed Hal Murray's advice fired up the combination yesterday (its been running for about 24 hours now) and everything is working as advertised. The IsoTemp locked in with an EFC of 4.523 and today is down to 4.498 volts and falling slowly, so it would appear that boosting the Fury EFC range won't be necessary. Bruce Griffiths suggested a 1.6 gain buffer amplifier and Jim Miller had designed that exact amplifier to boost an EFC range of 0 - 5v to 0 - 8v specifically for the IsoTemp OCXO134. Jim had a PCB available, so I ordered it and will build that up if the IsoTemp starts aging in the wrong direction. I believe that problem has been addressed. I've not yet solved the power sequence problem (if it exists); I'll follow Said's advice and just try powering both from the same supply and see if the Fury reset hold time is sufficient. If not, I'll pursue Jim Hall's MAX6819 approach. That would seem to be a simple and inexpensive solution. Now I'm trying to understand Bill Jones' GPSCon program and what it is telling me about the Fury GPSDO. With some history provided by GPSCon and a better understanding of just what, exactly, I should expect to see and to strive for, I will apply Said's suggestions and see what develops. BTW, it would appear as though my HP 53131A counter reads 220 mHz low with a 2 second gate time. There appears to be no appreciable drift; it always reads 220 mHz low. I'm sure there is a name for that measurement, I hope to learn it soon. Thanks to all for your help. I'm amazed at the high signal to noise ratio on this list. -- kc0ukk at msosborn dot com ___ 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 lamp lifetime...
Hello Thanks for your PDF Bob > Message: 5 > Date: Mon, 03 Nov 2008 01:46:37 +0100 > From: Adrian <[EMAIL PROTECTED]> > Subject: Re: [time-nuts] Rb lamp lifetime... > To: Yuri Ostry <[EMAIL PROTECTED]>, Discussion of precise time and >frequency measurement > Message-ID: <[EMAIL PROTECTED]> > Content-Type: text/plain; charset="iso-8859-1" > > Hello, > > there are some interesting hints (including lamp rejuvenation) in the > attached papaer that was posted here a few months ago by Gerald > Molenkamp VK3FGJM. > > Regards, > Adrian > > > Yuri Ostry schrieb: > > 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 running home lab frequency reference. Trying to understand > > for myself, is it worth to get spare unit (or even two) of the same > > model just to have replacement lamp on hand. > > > > One more question - does someone seen Rb standard that is > > malfunctioned due to degraded lamp, that, at same time, does have > > good vacuum. If so, which model, and how the failed lamp looks like? > > Was there any attempts to "rejuvenate" the lamp? (for example, heating > > to remove glass darkening, if any, or similar experiments). > > > > By the way, I'm very curious about physical process that may cause > > lamp degradation. > > > > Rubidium-87 that is included in the lamp (according to > > manuals) is a radionuclide, beta emitter. It decays very slowly (4.7 > > billion years half life) to stable Strontium-87, emitting 282.62keV > > electrons and (anti?)neutrino. I don't think that 87Rb decay may > > interfere with unit operation after tens of years, unless 87Sr is > > "poisonous" so much so it can interfere with lamp operation even in > > tiniest amounts. > > > > The only reference I located to date, is following article, that is > > not available to general public. It is hard to understand for me just > > from this abstract, does it specifically related to space environment > > factors, or it is something that may cause degradation of Rb clocks > > that is operated in average lab on Earth. ;) > > > > > >> A Mechanism of Rubidium Atomic Clock Degradation: Ring-Mode to > >> Red-Mode Transition in rf-Discharge Lamps > >> Camparo, J. Mackay, R. > >> Aerosp. Corp., El Segundo; > >> > >> > >> This paper appears in: Frequency Control Symposium, 2007 Joint with > >> the 21st European Frequency and Time Forum. IEEE International > >> Publication Date: May 29 2007-June 1 2007 > >> On page(s): 45-48 > >> Location: Geneva, > >> ISSN: 1075-6787 > >> ISBN: 978-1-4244-0647-0 > >> INSPEC Accession Number: 9805223 > >> Digital Object Identifier: 10.1109/FREQ.2007.4319027 > >> Current Version Published: 2007-10-01 > >> > >> > >> > >> > >> > >> Abstract > >> In the vapor-cell atomic clock, long-term stability can be > >> influenced by slow variations in the discharge lamp's output via the > >> light-shift effect. Additionally, over a multi-year mission lifetime > >> the lamp's aging can degrade its optical pumping efficiency. > >> Understanding the mechanism(s) that drives these changes is > >> particularly important for spacecraft devices, where the atomic > >> clocks are called upon to function continuously and reliably for > >> many years. Here, we consider the two well-known, but little > >> studied, modes associated with alkali rf-discharge lamp operation: > >> the ring mode and the red mode. Consistent with previous research, > >> we find that the ring mode is best for optical pumping, and that the > >> clock-signal amplitude degrades significantly when the lamp operates > >> in the red mode. Examining the emission spectrum as the lamp > >> transitions between these two modes, we show that the ring-mode to > >> red-mode transition is driven by radiation trapping within the lamp. > >> > > > > > > > > -- next part -- > A non-text attachment was scrubbed... > Name: EFRATOM Model FRS Lamp assembly repair.pdf > Type: application/pdf > Size: 59765 bytes > Desc: not available > Url : > http://www.febo.com/pipermail/time-nuts/attachments/20081103/c205b683/attachment.pdf > > -- > > ___ > time-nuts mailing list > time-nuts@febo.com > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > End of time-nuts Digest, Vol 52, Issue 8 > > ___ 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 lamp lifetime...
Hello Roy Thanks,I am Bob also the fluke.l on ebay.Most of the gentlemans at here seem have known me. As the Time-nuts member .if any member buy any stuff on my ebay store. if you Directly use the Paypal not from ebay,i will offer 5 % discount . and if my goods have any problem and No Function when you get.just tell me. let me solve it. Most of time,just pay me the shipping fee will ok.i send the replacement. About some one say how i can get so many Rubidium oscillator for selling . This Q Most of the Rb , from USA ,the every lucent's or Nortel's BTS have one Rb as standard. Thanks and best regards Bob 2008/11/3 <[EMAIL PROTECTED]> > Send time-nuts mailing list submissions to >time-nuts@febo.com > > To subscribe or unsubscribe via the World Wide Web, visit >https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > or, via email, send a message with subject or body 'help' to >[EMAIL PROTECTED] > > You can reach the person managing the list at >[EMAIL PROTECTED] > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of time-nuts digest..." > > > Today's Topics: > > 1. Re: Testing frequency using NTP (M. Warner Losh) > 2. Re: Testing frequency using NTP (M. Warner Losh) > 3. Re: Jackson Labs Fury & Isotemp OCXO134-10 ([EMAIL PROTECTED]) > 4. Re: What's the time Mr Wolf... (Hal Murray) > 5. Re: Testing frequency using NTP (Poul-Henning Kamp) > 6. Re: Isotemp 134-10 & Fury (Richard Moore) > 7. Re: What's the time Mr Wolf... (Bj?rn Gabrielsson) > 8. Re: Rb lamp lifetime... (Roy Phillips) > > > -- > > Message: 1 > Date: Sun, 02 Nov 2008 19:32:46 -0700 (MST) > From: "M. Warner Losh" <[EMAIL PROTECTED]> > Subject: Re: [time-nuts] Testing frequency using NTP > To: time-nuts@febo.com, [EMAIL PROTECTED] > Message-ID: <[EMAIL PROTECTED]> > Content-Type: Text/Plain; charset=us-ascii > > In message: <[EMAIL PROTECTED]> >"David M. Witten II" <[EMAIL PROTECTED]> writes: > : Will a usable build of FreeBSD 7.x run in the memory available on the > : older Soekris boards? (64 MB RAM) > > No. My router/dhcp server, mail forwarding anti-spam agent, external > DNS server are all on my soekris 4521. I'm running 7.0 on it. It > only has 64MB of memory and I've never had memory problems. > > Warner > > > > -- > > Message: 2 > Date: Sun, 02 Nov 2008 19:38:15 -0700 (MST) > From: "M. Warner Losh" <[EMAIL PROTECTED]> > Subject: Re: [time-nuts] Testing frequency using NTP > To: time-nuts@febo.com, [EMAIL PROTECTED] > Message-ID: <[EMAIL PROTECTED]> > Content-Type: Text/Plain; charset=us-ascii > > In message: <[EMAIL PROTECTED]> >"M. Warner Losh" <[EMAIL PROTECTED]> writes: > : In message: <[EMAIL PROTECTED]> > : "David M. Witten II" <[EMAIL PROTECTED]> writes: > : : Will a usable build of FreeBSD 7.x run in the memory available on the > : : older Soekris boards? (64 MB RAM) > : > : No. My router/dhcp server, mail forwarding anti-spam agent, external > : DNS server are all on my soekris 4521. I'm running 7.0 on it. It > : only has 64MB of memory and I've never had memory problems. > > Errr, I should have said 'Yes.' My no was answering the question 'Will > it run out of memory?' > > %vmstat > procs memory page disk faults cpu > r b w avmfre flt re pi po fr sr ad0 in sy cs us sy id > 0 0 0 38492 225762 0 0 0 1 0 0 1354 25 488 1 3 96 > > Warner > > > > -- > > Message: 3 > Date: Sun, 2 Nov 2008 22:56:29 EST > From: [EMAIL PROTECTED] > Subject: Re: [time-nuts] Jackson Labs Fury & Isotemp OCXO134-10 > To: time-nuts@febo.com > Message-ID: <[EMAIL PROTECTED]> > Content-Type: text/plain; charset="US-ASCII" > > Hi Bill, > > thanks for sending the datasheets. > > Looks like the unit has nominally +/-6Hz EFC range, slightly less than the > OCXO's we typically use. > > I would thus try increasing the DAC Gain to about 30 to 40 and see how that > works. > > bye, > Said > > > In a message dated 11/2/2008 18:06:18 Pacific Standard Time, > [EMAIL PROTECTED] > writes: > > Said, > > Find attached two PDF files of the specs, drawing and pinout for the > Isotemp > 134-10. > > BillWB6BNQ > > > > ___ > 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. > > > > -- > > Message: 4 > Date: Mon, 03 Nov 2008 00:21:38 -0800 > From: Hal Murray <[EMAIL PROTECTED]> > Subject: Re: [time-nuts] What's the time Mr Wolf... > To: Discussion of precise time and frequency measurement > > Message-ID: <[EMAIL PROTECTED]> > Content-Type: text/plain; charset=us-ascii > > > > So everything is derived from this oscillator, which is actually > > 10.
Re: [time-nuts] Do any regulations or laws require tim e to be accurate within 'x' seconds?
- Original Message - From: "Gretchen Baxter" <[EMAIL PROTECTED]> To: "Discussion of precise time and frequency measurement" Sent: Monday, November 03, 2008 5:03 PM Subject: [time-nuts] Do any regulations or laws require time to be accurate within 'x' seconds? > Greetings, > > There are a lot of regulations that mandate synchronized time. > > But do any of these regulations or laws require time to be accurate within > 'x' seconds? Such as, 'time much be synchronized within 5 seconds of GPS > time. > > Thanx, > > Gretchen > ___ > 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] Do any regulations or laws require t ime to be accurate within ‘x’ seconds?
Greetings, There are a lot of regulations that mandate synchronized time. But do any of these regulations or laws require time to be accurate within 'x' seconds? Such as, 'time much be synchronized within 5 seconds of GPS time. Thanx, Gretchen ___ 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] HP1600A manual
Hi Dave, Thank you! Usually there is a section in the manual to do a quick performance test. If it would be possible to scan this part, that would help a lot! Thank you, looking forward to your next message. Best regards, Jeroen Dave Brown wrote: I have a mint 1600A plus manual (s?) here somewhere, Jeroen- will try to find it/them! Sorry, no digital copy though but I should be able to scan some of it for you. DaveB, NZ - Original Message - From: "Jeroen Bastemeijer" <[EMAIL PROTECTED]> To: "Discussion of precise time and frequency measurement" Sent: Friday, October 31, 2008 10:10 PM Subject: [time-nuts] HP1600A manual Dear All, Is there anyone out there who has a digital copy of the HP 1600A logic analyzer manual? I found such an old machine, and I'm wondering if it is still working... There are manuals for sale for approx $50 (excl. shipping). However, the HP1600A seems not to be very responsive. So, investing $50 for a machine which is defective and probably cannot be repaired seems like a waste. Or is there anyone who can give a hint on how to test a HP 1600A, to get a good indication if it is still functioning (reasonably) okay. At this moment the machine seems to be locked up. Allthough there is a nice pattern of 1's and 0's on the screen Thanks, best regards Jeroen ___ 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. No virus found in this incoming message. Checked by AVG - http://www.avg.com Version: 8.0.175 / Virus Database: 270.8.5/1757 - Release Date: 30/10/2008 14:35 ___ 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. begin:vcard fn:Jeroen Bastemeijer n:Bastemeijer;Jeroen org:Delft University of Technology;Electronic Instrumentation Laboratory adr:GPS: Lat N52.2 Lon E4.37157 Alt. 46.2m;;Mekelweg 4;Delft;;2628CD;Netherlands email;internet:[EMAIL PROTECTED] title:Ing. tel;work:+31.15.278.6542 tel;fax:+31.15.278.5755 url:www.tudelft.nl version:2.1 end:vcard ___ 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] What's the time Mr Wolf...
> btw... I once heard a story that early GPS SVs could turn off the > relativistic compensation. There was also a switch to reverse the > sign... ;-) I don't remember hearing there was a sign reversal switch, but all the other details on the first pre-GPS SV are here: http://www.leapsecond.com/history/Ashby-Relativity.htm /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.
Re: [time-nuts] Rb lamp lifetime...
David I would suggest that you email Bob Mokia ,(China) ,directly at [EMAIL PROTECTED] requesting his "best" price. I obtained my TBolt from this source. It was a 2004 issue, and in excellent condition. It has been performing superbly for the past three weeks, and in my case it had replaced my Odetics 325. I trust I am not breaking the rules by making this suggestion, but I was also disappointed when I failed to obtain a TBolt through TAPR when the offers were made. Roy Phillips - Original Message - From: "David M. Witten II" <[EMAIL PROTECTED]> To: ; <[EMAIL PROTECTED]> Sent: Monday, November 03, 2008 1:28 AM Subject: [time-nuts] Rb lamp lifetime... How much would be reasonable to pay for one of these on EBay? I see someone asking $259 for one. I'm sure that TAPR's price was much better, but I wasn't paying attention. Dave Witten WB6BNQ wrote: Yuri, Sorry about that, but I guess the Trimble Thunderbolts are out of stock all ready. BillWB6BNQ WB6BNQ wrote: > Hi Yuri, > > Unless you need the longer term stability of an undisciplined Rb source, I think > you would be better served to get one of the “Timenuts group” Trimble Thunderbolt > GPS units to use as a home standard. It is available via this page: > ___ 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] What's the time Mr Wolf...
On Mon, 2008-11-03 at 00:21 -0800, Hal Murray wrote: > > So everything is derived from this oscillator, which is actually > > 10.2299543 MHz. This -4.57 mHz corrects for relativistic > effects. > > Neat. Thanks. > > I got curious. How does that compare to the Doppler shifts? > > google found this nice description of GPS : > http://www.go.ednet.ns.ca/~larry/gps/gps_talk.html > > It says the Doppler shift is up to 2400 HZ. > > That's a half-million times the relativistic correction. There is also about 1 kHz frequency uncertainty from the crystal driving the GPS receiver. As most receivers use oscillators specified at about 0.5ppm. btw... I once heard a story that early GPS SVs could turn off the relativistic compensation. There was also a switch to reverse the sign... ;-) -- Björn ___ 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] Isotemp 134-10 & Fury
The Isotemp 134-10 *may* have a screw in the side of the case that gives access to a trimmer for the frequency. You can set your Fury to an EFC output of 2.5V and try adjusting the trimmer for 10MHz or as close as you can get it. This will optimize your control range from the Fury, with the proviso that the Isotemp's control slope is not linear. My OFC version does not have the access port, but it it a much earlier model than the Isotemp 134. The Isotemp has a positive control slope -- increasing EFC increases frequency. Mine has an EFC sensitivity of about 2E-7 per Volt. Dick Moore > From: Matt Osborn <[EMAIL PROTECTED] > (mailto:[EMAIL PROTECTED]) > > Date: November 1, 2008 23:28:34 PDT > To: time-nuts <[EMAIL PROTECTED] (mailto:time-nuts@febo.com) > > Subject: [time-nuts] Jackson Labs Fury & Isotemp OCXO134-10 > Reply-To: Discussion of precise time and frequency measurement > <[EMAIL PROTECTED] (mailto:time-nuts@febo.com) > > > I think that I've managed to keep a low profile here, trusting that I > would learn more if I refrained from random interjections of > ill-informed thoughts. However, there comes a point in every man's > life... > > A year or two ago, I took advantage of Said's offer and purchased one > of the Jackson Labs OEM external OCXO Fury units and am > attempting to > put it to work. I've decided to use an Isotemp OCXO134-10 oscillator > and have several decisions which I would like to vet with those of > you > that have been down this road before. > > The Isotemp unit has an EFC range of 0 to 8 Volts; the Fury has an > EFC > range of 0 to 5 volts. Using my HP 53131A, I'm able to adjust the > Isotemp to 10 MHz +- 5 mHz with an EFC voltage of 4.64 volts. > That is > within the adjustment range of the Fury, but I'm not sure of the > accuracy of the HP53131A. Should I construct a resistive network ala > Brooks Shera to 'boost' the EFC range just in case or would I be > better off just using the Fury 'as is'? > > Secondly, the Jackson Labs advises that since the Fury uses the > external oscillator as its clock, that the oscillator should be > powered up before the Fury itself. I was hoping that I would be able > to use a single power switch to power both the oscillator and the > Fury > simultaneously, but now I'm not so sure. > > Finally, are there any of you that have used the Isotemp OXCO134-10 > with the Fury? Have any of you worked out the various SERVO settings > that the Fury makes available? I'm interested in the DAC gain, EFC > scale, EFC dampening and Phase compensation. > > Any and all advice will be gratefully accepted. > > -- kc0ukk at msosborn dot com > ___ 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] Testing frequency using NTP
In message <[EMAIL PROTECTED]>, "David M. Witten II" writes: >Can I still expect to see similar performance using more recent versions >of FreeBSD than you originally used? Yes, the timestamping is done in hardware, so it does not depend on the OS version. >Will a usable build of FreeBSD 7.x run in the memory available on the >older Soekris boards? (64 MB RAM) Absolutely. >I understand that there are features that made boards incorporating the >133 MHz AMD ElanSC520 processors suitable for this purpose. Are these >features still present in the newer AMD Geode LX based boards? No. >Though I know that you have worked with Soekris products a lot, is there >any reason that the same techniques cannot be applied to the WRAP and >ALIX boards from PCEngines? or perhaps an One Laptop Per Child (OLPC) XO? It all comes down to the special counter hardware in the Elan520 CPU, any board with an Elan520 where you can get at the timer1 pin is fine. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 [EMAIL PROTECTED] | 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.
Re: [time-nuts] What's the time Mr Wolf...
> So everything is derived from this oscillator, which is actually > 10.2299543 MHz. This -4.57 mHz corrects for relativistic effects. Neat. Thanks. I got curious. How does that compare to the Doppler shifts? google found this nice description of GPS : http://www.go.ednet.ns.ca/~larry/gps/gps_talk.html It says the Doppler shift is up to 2400 HZ. That's a half-million times the relativistic correction. -- These are my opinions, not necessarily my employer's. 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.
