Re: [time-nuts] Clocking a PIC16F628A from a Rubidium Standard
On Fri, Nov 25, 2011 at 1:21 PM, Robert Atkinson robert8...@yahoo.co.ukwrote: Hi, Microchip cerainly condone using input protection diodes of PIC devices as clamps. There are application notes for zero-crossing detection which connect the input to the 115V AC line via a resistor. Note that these are intentional protection diodes, not unavoidable parasitic junctions. Typical Absolute max clamp current (inc. 16F628) is +-20mA. Yes, absolute max - that below which the part doesn't let the magic smoke out... but note the comment below the absolute max ratings (I'm taking this from a PIC16F88 datasheet since I happen to be using this part): This is a stress rating only and functional operation of the device at those or any other conditions above those indicated in the operation listings of this specification is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability. Note also the max voltage on any pin is something like Vdd+0.3V. One wonders how much conducting their diodes do with 0.3V across them. Personally, I don't let the protection diodes conduct in normal operation. Orin. ___ 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] Low noise power supplies - dont' use Electrolytics
In message cabbxvhvnsaxbx5uorjtqesttd50yedyavkgxh52bpspuayt...@mail.gmail.com , Chris Albertson writes: One question: How does one avoid using electrolytic caps if you need (say) 1,000uF or even 100uF. Those would be some mighty big film caps. One detail, often overlooked, is that electrolytics seldom are dimensioned very precisely, mostly because they do come with such big capacity but also because them have very big tolerances, +/- 50% is not uncommon. Another effect that causes overdimensioning is that they are not very good capacitors, in particular at higher frequency. I have in a couple of instances replaced electrolytics with film-caps and gotten away with less than 1% of the original capacitance by doing a bit of calculations and measurements on the actual circuit. In one case, an audio circuit had 1000uF for a handful of opamps, using 4.7uF of good film capacitors instead reduced THD by 80%. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | 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] DGPS@home
If you do a test, let us know your findings. I think the answer will depend upon how good the location is. If the limitation is ionosphere delays, two units near each other should have similar errors. If the limitation is multipath, being near each other probably won't help much. --- This was a good excuse to make some graphs. I have lots of data. Most of it is from units that are indoors and barely work. Not surprisingly, the location data is far from good. Conveniently, I had a pair of units next to each other and grabbed all the NMEA data for over a month. I took a random day. One of the units had 74777 valid samples, the other had 32439. There were 28651 seconds that had good data from both units. I wrote some hack software to merge the data on the seconds that overlapped then plotted the difference in lat/lon. I've seen samples off by miles. Yes, not many samples but a few. :) Data collection may need another filter: don't treat a sample as good unless the previous few samples were good. Remember, this is a crappy location. Quick summary for those who don't like graphs, if you ignore anything off by more than 20 feet in either lat or lon, it's a random number generator. Here is the same data with different vertical scales: http://www.megapathdsl.net/~hmurray/robot/diff.png http://www.megapathdsl.net/~hmurray/robot/diff-1000.png http://www.megapathdsl.net/~hmurray/robot/diff-20.png Maybe I'll get a chance to collect some data outside in a reasonable location... -- 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] DGPS@home
Hal, Those sure look like GNU plot graphs :) Sorry, i didn't mean to change subjects but i do like gnu plot. Steve On Sat, Nov 26, 2011 at 4:20 AM, Hal Murray hmur...@megapathdsl.net wrote: If you do a test, let us know your findings. I think the answer will depend upon how good the location is. If the limitation is ionosphere delays, two units near each other should have similar errors. If the limitation is multipath, being near each other probably won't help much. --- This was a good excuse to make some graphs. I have lots of data. Most of it is from units that are indoors and barely work. Not surprisingly, the location data is far from good. Conveniently, I had a pair of units next to each other and grabbed all the NMEA data for over a month. I took a random day. One of the units had 74777 valid samples, the other had 32439. There were 28651 seconds that had good data from both units. I wrote some hack software to merge the data on the seconds that overlapped then plotted the difference in lat/lon. I've seen samples off by miles. Yes, not many samples but a few. :) Data collection may need another filter: don't treat a sample as good unless the previous few samples were good. Remember, this is a crappy location. Quick summary for those who don't like graphs, if you ignore anything off by more than 20 feet in either lat or lon, it's a random number generator. Here is the same data with different vertical scales: http://www.megapathdsl.net/~hmurray/robot/diff.png http://www.megapathdsl.net/~hmurray/robot/diff-1000.png http://www.megapathdsl.net/~hmurray/robot/diff-20.png Maybe I'll get a chance to collect some data outside in a reasonable location... -- 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. ___ 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] Fw: Clocking a PIC16F628A from a Rubidium Standard
- Forwarded Message - From: Robert Atkinson robert8...@yahoo.co.uk To: Orin Eman orin.e...@gmail.com Sent: Saturday, 26 November 2011, 12:21 Subject: Re: [time-nuts] Clocking a PIC16F628A from a Rubidium Standard Hi, Absolute max I understand, but even at 10% of Abs max you have 2mA, a significant current and more than enough to power a pic at lower clock speeds. A 100k resistor in series with the US mains of 115V would not exceed 10% of abs max. I'd be happy to run a non-critical devices at 75% of Abs max. You need to read the voltage spec in conjunction with the current. If there is no current limiting the voltage must be kept 0.3V below / above the supply rails to prevent the diodes conducting. If the current is limited to less than 20mA the voltage will be clamped to within 0.3V of the rails without damage. Robert G8RPI From: Orin Eman orin.e...@gmail.com To: Robert Atkinson robert8...@yahoo.co.uk; Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Saturday, 26 November 2011, 8:43 Subject: Re: [time-nuts] Clocking a PIC16F628A from a Rubidium Standard On Fri, Nov 25, 2011 at 1:21 PM, Robert Atkinson robert8...@yahoo.co.uk wrote: Hi, Microchip cerainly condone using input protection diodes of PIC devices as clamps. There are application notes for zero-crossing detection which connect the input to the 115V AC line via a resistor. Note that these are intentional protection diodes, not unavoidable parasitic junctions. Typical Absolute max clamp current (inc. 16F628) is +-20mA. Yes, absolute max - that below which the part doesn't let the magic smoke out... but note the comment below the absolute max ratings (I'm taking this from a PIC16F88 datasheet since I happen to be using this part): This is a stress rating only and functional operation of the device at those or any other conditions above those indicated in the operation listings of this specification is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability. Note also the max voltage on any pin is something like Vdd+0.3V. One wonders how much conducting their diodes do with 0.3V across them. Personally, I don't let the protection diodes conduct in normal operation. Orin. ___ 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] Low noise power supplies - dont' use Electrolytics
On Sat, Nov 26, 2011 at 2:13 AM, gary li...@lazygranch.com wrote: At sane temperatures, OSCONs are very good. Who runs their gear hot enough to boil water? National Fire Protection Agency (NFPA) 2007 edition of their design regulations state the electronics worn by Fire Fighters must work at 500'F for five minutes. In the Paper Pusher's mind the Kevlar clothing can withstand those temperatures, therefor anything else in the Universe can too. Never under estimate the bureaucratic mind... ___ 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 Monitoring for Pocket PC
Hi Justin, You are not the only one! I have a Thunderbolt and a couple of iPaqs. The program looks great. I'm considering gutting a unit and building it into the case with my T-Bolt. They are available used at minimal cost. Thank you for making this avialable. Robert G8RPI. From: Justin Pinnix jus...@fuzzythinking.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Friday, 25 November 2011, 22:55 Subject: [time-nuts] Thunderbolt Monitoring for Pocket PC Nuts, A while back, I scored an old Compaq iPaq Pocket PC for cheap at an auction. Recently, I wrote a program for it that reads the time and health information from a Thunderbolt and displays it in real-time. More info available here: http://www.fuzzythinking.com/projects/thunderhead/ I may be the only guy in the world who owns both of those pieces of hardware, but in case anyone else does, please enjoy this program. Thanks, -Justin ___ 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] Thunderbolt Monitoring for Pocket PC
Thanks Robert. Another fellow also replied privately with the enclosure idea. That sounds like a good idea, but make sure you leave some way to punch the reset button on the bottom of the iPaq from outside the case. Before I got shutdown working, that was the only way to get the serial port back. FWIW, my Thunderbolt is screwed to a wall mounted panel near floor level. I have the iPaq sitting in its cradle on top of my desk, thus using a minimal amount of space and only a single cable needs to go to the desk. That backlight really helps light up the room at night :-) Thanks, -Justin On Sat, Nov 26, 2011 at 8:02 AM, Robert Atkinson robert8...@yahoo.co.ukwrote: Hi Justin, You are not the only one! I have a Thunderbolt and a couple of iPaqs. The program looks great. I'm considering gutting a unit and building it into the case with my T-Bolt. They are available used at minimal cost. Thank you for making this avialable. Robert G8RPI. From: Justin Pinnix jus...@fuzzythinking.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Friday, 25 November 2011, 22:55 Subject: [time-nuts] Thunderbolt Monitoring for Pocket PC Nuts, A while back, I scored an old Compaq iPaq Pocket PC for cheap at an auction. Recently, I wrote a program for it that reads the time and health information from a Thunderbolt and displays it in real-time. More info available here: http://www.fuzzythinking.com/projects/thunderhead/ I may be the only guy in the world who owns both of those pieces of hardware, but in case anyone else does, please enjoy this program. Thanks, -Justin ___ 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] PC time app
On 11/25/11 9:56 PM, Steve . wrote: I'm curious as to what folks are doing with PC's that require micro second accuracy for days or weeks or what have you. Any examples? not microseconds, but milliseconds... Running multi-day tests in a spacecraft testbed where you've got PC-based test equipment logging data. Typical PC clock errors of 50-100 ppm is seconds in a day... ___ 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 217-9043 10MHz OCXO
Hijacking my own thread back here :) Thanks for tip - I did know about Skycraft, and I think there was another in the Orlando area, but I wasn't able to make the trip over that way before I had to leave town. Back on topic though, if anyone has an old catalog, or some other source of info on the old Vectron OCXO such as I mentioned, it would be most helpful. I'm not even sure if I'm running it at the right voltage. Thanks! ___ 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] SDR GPS
Quoting Poul-Henning Kamp p...@phk.freebsd.dk: Has any of you played with this: http://www.sparkfun.com/products/8238 www.gpscreations.com/Products_GPS1A.html looks like a version you can still purchase. But for the $500 they want I'd spend a little more and get a real SDR useful for other projects (QS1R etc.) and then homebrew a single-chip gps front end (MAX2769B etc.) and feed the 4 MHz IF to the SDR. More importantly, that device says it uses this open source gps signal processing package: sourceforge.net/projects/osgps/develop ___ 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 Monitoring for Pocket PC
On Nov 25, 2011, at 3:55 PM, Justin Pinnix wrote: A while back, I scored an old Compaq iPaq Pocket PC for cheap at an auction. Recently, I wrote a program for it that reads the time and health information from a Thunderbolt and displays it in real-time. More info available here: http://www.fuzzythinking.com/projects/thunderhead/ Nice project. Could you recommend some model numbers of iPaqs that would be compatible with the hardware and software? Thanks! Kevin ___ 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 Monitoring for Pocket PC
I was going to ask a similar question as I have a Fujitsu Siemens LOOX 420 pocket PC. Wouldn't probably make more than £10 on EBay, so it's worth more to me to do something like this with it. Rob Kimberley -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Kevin Rosenberg Sent: 26 November 2011 17:13 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Thunderbolt Monitoring for Pocket PC On Nov 25, 2011, at 3:55 PM, Justin Pinnix wrote: A while back, I scored an old Compaq iPaq Pocket PC for cheap at an auction. Recently, I wrote a program for it that reads the time and health information from a Thunderbolt and displays it in real-time. More info available here: http://www.fuzzythinking.com/projects/thunderhead/ Nice project. Could you recommend some model numbers of iPaqs that would be compatible with the hardware and software? Thanks! Kevin ___ 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] Clocking a PIC16F628A from a Rubidium Standard
Come on, folks. never hook anything directly to the power line. The source is just too stiff. Use an opto. I used fiber optic isolation with my big DC power supply. Don Orin Eman On Fri, Nov 25, 2011 at 1:21 PM, Robert Atkinson robert8...@yahoo.co.ukwrote: Hi, Microchip cerainly condone using input protection diodes of PIC devices as clamps. There are application notes for zero-crossing detection which connect the input to the 115V AC line via a resistor. Note that these are intentional protection diodes, not unavoidable parasitic junctions. Typical Absolute max clamp current (inc. 16F628) is +-20mA. Yes, absolute max - that below which the part doesn't let the magic smoke out... but note the comment below the absolute max ratings (I'm taking this from a PIC16F88 datasheet since I happen to be using this part): This is a stress rating only and functional operation of the device at those or any other conditions above those indicated in the operation listings of this specification is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability. Note also the max voltage on any pin is something like Vdd+0.3V. One wonders how much conducting their diodes do with 0.3V across them. Personally, I don't let the protection diodes conduct in normal operation. Orin. ___ 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. -- Neither the voice of authority nor the weight of reason and argument are as significant as experiment, for thence comes quiet to the mind. R. Bacon If you don't know what it is, don't poke it. Ghost in the Shell Dr. Don Latham AJ7LL Six Mile Systems LLP 17850 Six Mile Road POB 134 Huson, MT, 59846 VOX 406-626-4304 www.lightningforensics.com www.sixmilesystems.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.
[time-nuts] Low noise power supplies - dont' use Electrolytics
Off topic: Actually, you can make almost anything withstand almost any conditions TEMPORARILY - it depends on the packaging too. If you wrap a circuit that can work at 100 deg C in a water jacket wrapped in high temperature insulation, you can keep it going until most of the water has boiled away. That's how those so-called fire safes can protect papers against fire for a certain amount of time - the insulation is hydrated gypsum, which insulates and provides cooling water. On topic: You can use whatever capacitors make sense for the application, but you know that the hotter they need to run, the less life is to be expected. Ed On Sat, Nov 26, 2011 at 2:13 AM, gary https://www.febo.com/cgi-bin/mailman/listinfo/time-nutslists at lazygranch.com wrote: At sane temperatures, OSCONs are very good. Who runs their gear hot enough to boil water? Sat Nov 26 12:53:13 UTC 2011 Bob Paddock bob.paddock at gmail.com wrote: National Fire Protection Agency (NFPA) 2007 edition of their design regulations state the electronics worn by Fire Fighters must work at 500'F for five minutes. In the Paper Pusher's mind the Kevlar clothing can withstand those temperatures, therefor anything else in the Universe can too. Never under estimate the bureaucratic mind... ___ 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] Clocking a PIC16F628A from a Rubidium Standard
On Nov 26, 2011, at 10:36 AM, Don Latham wrote: Come on, folks. never hook anything directly to the power line. The source is just too stiff. Use an opto. I used fiber optic isolation with my big DC power supply. I don't disagree on isolation. I will say that Atmel's (and presumably Microchip's) app notes don't give much information on safe construction. Tom wrote a nice page showing a safer-than-average construction for sipping AC main voltage through high resistance: http://www.leapsecond.com/pages/ac-detect/ Kevin ___ 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] PC time app
On Fri, Nov 25, 2011 at 9:56 PM, Steve . iteratio...@gmail.com wrote: I'm curious as to what folks are doing with PC's that require micro second accuracy for days or weeks or what have you. The way you get the reliability is easy, it just cost money. You set up multiple servers each with its own GPS receiver. I have a Intel Atom powered mainboard. I looked around and found one that did not have a fan on the heat sink. These use much less power, I I hopped made less heat Without the heat there is also no thermal management so it is stable. I installed Linux and connected a Motorolla Oncore GPS. These GPSes have the PPS running at about 60nS, 1 sigma. On NTP I've not been above to get down to single uS. Seem to be running at the dozen or so uS level. My guess is the next is to unsolder the crystal oscillator from the main board and replace it with something better. Likely a TCXO. That should help be more then one order of magnitude. -- Chris Albertson Redondo Beach, California ___ 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] Clocking a PIC16F628A from a Rubidium Standard
How did such a trivial circuit function for a one-unit application trigger such a large philosophical discourse? I guess I'll put my one-cent's worth in too. If you were designing to make a mission-critical item, or millions of units, then every part and every penny would count, so the finesse requirement would be high, and the details critical. But this is not the case here. All you need is an NPN open collector - a simple Q circuit - or the output of an OC TTL or OD CMOS gate to eliminate the powered v. unpowered states issue. Let the gate or Q circuit be driven from the Rb source +5 V and 10 MHz signal, and let the collector/drain output be pulled up to the PIC supply. If there is concern that for some reason the gate open-device output may not work right when the gate is unpowered, then just build it and see, or just use a transistor circuit. Ed ___ 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] Low noise power supplies - dont' use Electrolytics
On Fri, Nov 25, 2011 at 10:36 PM, Raj vu2...@gmail.com wrote: How about this way: Amplifying capacitance.. (Base/Ground cap * Beta) http://sound.westhost.com/project15.htm The above actually uses several quite large electrolytic. It is a good example of why you NEED to use them. Maybe someone can post a schematic of a simple 5V 5A power supply that does NOT use any electro caps. Chris Albertson Redondo Beach, California ___ 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] DGPS@home
Maybe you can figure out for use how long one must average the data to get down to a given position accuracy. The fact that you have a poor location is good. You are generating real-world numbers.If I use my GPS I find the location never moves more then a few inches at most. I have a roof mounted antenna and after averaging for an hour the data never gets better. On Sat, Nov 26, 2011 at 1:20 AM, Hal Murray hmur...@megapathdsl.net wrote: If you do a test, let us know your findings. I think the answer will depend upon how good the location is. If the limitation is ionosphere delays, two units near each other should have similar errors. If the limitation is multipath, being near each other probably won't help much. --- This was a good excuse to make some graphs. I have lots of data. Most of it is from units that are indoors and barely work. Not surprisingly, the location data is far from good. Conveniently, I had a pair of units next to each other and grabbed all the NMEA data for over a month. I took a random day. One of the units had 74777 valid samples, the other had 32439. There were 28651 seconds that had good data from both units. I wrote some hack software to merge the data on the seconds that overlapped then plotted the difference in lat/lon. I've seen samples off by miles. Yes, not many samples but a few. :) Data collection may need another filter: don't treat a sample as good unless the previous few samples were good. Remember, this is a crappy location. Quick summary for those who don't like graphs, if you ignore anything off by more than 20 feet in either lat or lon, it's a random number generator. Here is the same data with different vertical scales: http://www.megapathdsl.net/~hmurray/robot/diff.png http://www.megapathdsl.net/~hmurray/robot/diff-1000.png http://www.megapathdsl.net/~hmurray/robot/diff-20.png Maybe I'll get a chance to collect some data outside in a reasonable location... -- 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. -- Chris Albertson Redondo Beach, California ___ 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 Monitoring for Pocket PC
Hi, Runs OK on both my HP iPaq H2200 (Pocket PC 2003 Ver. 4.20)and Compaq iPaq 3950 (Pocket PC 2002 Ver. 3.0) Robert G8RPI. From: Kevin Rosenberg ke...@rosenberg.net To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Saturday, 26 November 2011, 17:12 Subject: Re: [time-nuts] Thunderbolt Monitoring for Pocket PC On Nov 25, 2011, at 3:55 PM, Justin Pinnix wrote: A while back, I scored an old Compaq iPaq Pocket PC for cheap at an auction. Recently, I wrote a program for it that reads the time and health information from a Thunderbolt and displays it in real-time. More info available here: http://www.fuzzythinking.com/projects/thunderhead/ Nice project. Could you recommend some model numbers of iPaqs that would be compatible with the hardware and software? Thanks! Kevin ___ 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] Clocking a PIC16F628A from a Rubidium Standard
Come on, folks. never hook anything directly to the power line. The source is just too stiff. Use an opto. I used fiber optic isolation with my big DC power supply. Don I used to agree, until actually tried it myself. Now this is how I do my picPET 60 Hz data logging: Simple 60 Hz AC Mains Cycle Detector http://leapsecond.com/pages/ac-detect/ /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] Thunderbolt Monitoring for Pocket PC
Gee. I have an old Jornada palm with windows CE. Might work if i gan generate a serial interface? Don Robert Atkinson Hi, Runs OK on both my HP iPaq H2200 (Pocket PC 2003 Ver. 4.20)and Compaq iPaq 3950 (Pocket PC 2002 Ver. 3.0) Robert G8RPI. From: Kevin Rosenberg ke...@rosenberg.net To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Saturday, 26 November 2011, 17:12 Subject: Re: [time-nuts] Thunderbolt Monitoring for Pocket PC On Nov 25, 2011, at 3:55 PM, Justin Pinnix wrote: A while back, I scored an old Compaq iPaq Pocket PC for cheap at an auction. Recently, I wrote a program for it that reads the time and health information from a Thunderbolt and displays it in real-time. More info available here: http://www.fuzzythinking.com/projects/thunderhead/ Nice project. Could you recommend some model numbers of iPaqs that would be compatible with the hardware and software? Thanks! Kevin ___ 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. -- Neither the voice of authority nor the weight of reason and argument are as significant as experiment, for thence comes quiet to the mind. R. Bacon If you don't know what it is, don't poke it. Ghost in the Shell Dr. Don Latham AJ7LL Six Mile Systems LLP 17850 Six Mile Road POB 134 Huson, MT, 59846 VOX 406-626-4304 www.lightningforensics.com www.sixmilesystems.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] Clocking a PIC16F628A from a Rubidium Standard
well, grudgingly. only need the 1 meg to the hot side of the line, no connection to the neutral needed, with 1 meg in there, normal ground connections are going to supply the low side...It still lurks... Don Tom Van Baak Come on, folks. never hook anything directly to the power line. The source is just too stiff. Use an opto. I used fiber optic isolation with my big DC power supply. Don I used to agree, until actually tried it myself. Now this is how I do my picPET 60 Hz data logging: Simple 60 Hz AC Mains Cycle Detector http://leapsecond.com/pages/ac-detect/ /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. -- Neither the voice of authority nor the weight of reason and argument are as significant as experiment, for thence comes quiet to the mind. R. Bacon If you don't know what it is, don't poke it. Ghost in the Shell Dr. Don Latham AJ7LL Six Mile Systems LLP 17850 Six Mile Road POB 134 Huson, MT, 59846 VOX 406-626-4304 www.lightningforensics.com www.sixmilesystems.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] Clocking a PIC16F628A from a Rubidium Standard
Hi Don: Not a good idea. There are a number of fault conditions that can cause Neutral to be tens of volts above ground. Tom's circuit with a Meg in both the Hot and Neutral lines is much safer for you equipment. Have Fun, Brooke Clarke http://www.PRC68.com http://www.End2PartyGovernment.com/ Don Latham wrote: well, grudgingly. only need the 1 meg to the hot side of the line, no connection to the neutral needed, with 1 meg in there, normal ground connections are going to supply the low side...It still lurks... Don Tom Van Baak Come on, folks. never hook anything directly to the power line. The source is just too stiff. Use an opto. I used fiber optic isolation with my big DC power supply. Don I used to agree, until actually tried it myself. Now this is how I do my picPET 60 Hz data logging: Simple 60 Hz AC Mains Cycle Detector http://leapsecond.com/pages/ac-detect/ /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. ___ 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] DGPS@home
Maybe you can figure out for use how long one must average the data to get down to a given position accuracy. The fact that you have a poor location is good. You are generating real-world numbers. I'll be glad to provide lots of crappy data if anybody wants to play with it. -- The refclock (nmea, PPS, TBolt, ...) support in ntpd has code to discard outliers on a clump of timestamps. I think something like that would be very helpful when processing position data. The code is pretty simple in one dimension: sort, compute average, compare distance to left and right ends, discard one, adjust average... After the sort, the processing time is linear in the number of samples to be discarded. I haven't figured out how to do something like that in 2 dimensions: there is no left or right end. The basic idea you want to implement is to start with a large circle centered on the center of mass and shrink that circle until it hits a point. That's the point you want to discard. Pure brute force would compute the center of mass and then scan all the data points computing the distance... That's an N-squared process which might take too long with a large clump of data. For offline research like this, it might be OK. There is a slightly better approach that I'll call semi-brute force. The idea would be to make two lists: one for NS and one for EW, sort them, then use the longest end as a trial point. Then you scan in from the 4 ends. The semi- part is that you can stop when you get to the trial / sqrt(2). At first glance, discarding isn't cheap since you have to scan the other list/array. Actually, you don't have to scan the other list. Just mark that slot as dead. In either case, you can fixup the center location rather than recomputing it. If you notice a dead slot on the end of a list you can delete it. [I'm pretty sure that will get the right answer. I'll try again if that description isn't clear.] -- 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] PC time app
On 25 Nov, 2011, at 21:56 , Steve . wrote: I'm curious as to what folks are doing with PC's that require micro second accuracy for days or weeks or what have you. Any examples? Curious, Steve I have a PCI-X board with an FPGA which implements a clock running at 320 MHz. The 320 MHz can be phase-locked to an external 5 or 10 MHz frequency input, and the card also has 4 PPS inputs. A transition on a PPS input causes the FPGA to record a timestamp, with a precision of not quite 3 ns, and deliver it to software via an interrupt. The 10 MHz and PPS outputs from my GPS receiver are synchronous, so once the board clock is set it keeps the time of the GPS receiver without any further adjustment. The system (the OS is NetBSD, but with the kernel timekeeping replaced) computes its time as a linear function of the CPU's cycle counter, which on my machines seems to run at a constant 2.4 GHz. I can get a sample timestamp (actually a pair for them, the board-computer time comparison mechanism is the trickiest part of the design) from the FPGA by doing a load from a card register, so an 'rdtsc; load; rdtsc' gives me a sample offset between the computer's clock and the card's clock with a constant systematic error which (arguably) should be less than +/- 10 ns and with the board's precision of about 3 ns. I get sample offsets at randomly jittered intervals which average to about 0.25 seconds, so I get about 4 offsets per second with about 3 ns of round-off noise. The processing of these reduces to a linear least squares fit (the y-value is the offset, the x-value is the time of the sample with respect to the computer's clock) after some sanity filtering. The least squares fit gives me a frequency error and a time offset error, along with confidence intervals for each. I adjust the computer's clock when either the frequency error or the time offset becomes non-zero with 80% confidence. Typically I find the result of this to be, very roughly, a clock adjustment every 10 seconds, with a frequency adjustment on the order of 10^-9 and a time adjustment on the order of 10 ns. This is not perfectly reliable, of course; if I leave the cover off the computer and cold-spray the computer's innards I can drive the clock crazy, so it depends on temperature variations inside the case being modest, or at least occurring relatively slowly compared to my offset sample rate. When left alone in a rack in a quiet room, however, I seldom see anything bad happening, so I think it isn't dangerous to assert that the arrangement is typically keeping the computer's clock within +/- 20 ns of the GPS receiver, with worst case excursions being no worse than maybe +/- 50 ns. This has a number of uses, but is particularly good for NTP and PTP development. You can use a board in server synchronize the server's system clock to a GPS receiver, and then use a board tracking the same GPS receiver in a client machine to independently measure how well the software is managing the client machine's clock. This avoids having the NTP or PTP software grade its own homework. Dennis Ferguson ___ 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] Low noise power supplies - dont' use Electrolytics
On 11/26/11 11:13 AM, Chris Albertson wrote: On Fri, Nov 25, 2011 at 10:36 PM, Rajvu2...@gmail.com wrote: How about this way: Amplifying capacitance.. (Base/Ground cap * Beta) http://sound.westhost.com/project15.htm The above actually uses several quite large electrolytic. It is a good example of why you NEED to use them. Maybe someone can post a schematic of a simple 5V 5A power supply that does NOT use any electro caps. WHat ripple/regulation? 3 phase power and no filter gives you 8% ripple. Chris Albertson Redondo Beach, California ___ 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] Clocking a PIC16F628A from a Rubidium Standard
This area (SW Pennsylvania) we do not have galvanic ground distribution. So when a neutral is damaged all the load is forced back to the ground near the source. After some time the ground rod is completely corroded and does not provide a reliable earth sink. At this point there is no earth, and no network neutral. All 120 loads throw the balance out of whack and the local ground and neutral become a serious shock hazard. It's an interested condition where the safety circuity actually becomes live (because the network neutral is missing and the local ground is corrode) all grounded chassis become hot. It gets even more complicated depending how badly the ground rod is corroded, the original balance of the box (220 vs 120). I've seen 120 heat-lamp's back feed to 220 loads and act like slow blow fuses. I always use galvanic isolation on lines and neutrals. I've yet to find a solution to the live ground problem. Any ideas? Steve On Sat, Nov 26, 2011 at 4:50 PM, Brooke Clarke bro...@pacific.net wrote: Hi Don: Not a good idea. There are a number of fault conditions that can cause Neutral to be tens of volts above ground. Tom's circuit with a Meg in both the Hot and Neutral lines is much safer for you equipment. Have Fun, Brooke Clarke http://www.PRC68.com http://www.End2PartyGovernment.com/ Don Latham wrote: well, grudgingly. only need the 1 meg to the hot side of the line, no connection to the neutral needed, with 1 meg in there, normal ground connections are going to supply the low side...It still lurks... Don Tom Van Baak Come on, folks. never hook anything directly to the power line. The source is just too stiff. Use an opto. I used fiber optic isolation with my big DC power supply. Don I used to agree, until actually tried it myself. Now this is how I do my picPET 60 Hz data logging: Simple 60 Hz AC Mains Cycle Detector http://leapsecond.com/pages/ac-detect/ /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. ___ 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] Clocking a PIC16F628A from a Rubidium Standard
Sorry, Brooke-I was not clear. I meant to not connect anything to neutral at all, but rather to depend on the ground connection already made in the equipment for the low side of the signal, rather than a 1 meg to neutral at the plug. Sorry. Don Brooke Clarke Hi Don: Not a good idea. There are a number of fault conditions that can cause Neutral to be tens of volts above ground. Tom's circuit with a Meg in both the Hot and Neutral lines is much safer for you equipment. Have Fun, Brooke Clarke http://www.PRC68.com http://www.End2PartyGovernment.com/ Don Latham wrote: well, grudgingly. only need the 1 meg to the hot side of the line, no connection to the neutral needed, with 1 meg in there, normal ground connections are going to supply the low side...It still lurks... Don Tom Van Baak Come on, folks. never hook anything directly to the power line. The source is just too stiff. Use an opto. I used fiber optic isolation with my big DC power supply. Don I used to agree, until actually tried it myself. Now this is how I do my picPET 60 Hz data logging: Simple 60 Hz AC Mains Cycle Detector http://leapsecond.com/pages/ac-detect/ /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. ___ 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. -- Neither the voice of authority nor the weight of reason and argument are as significant as experiment, for thence comes quiet to the mind. R. Bacon If you don't know what it is, don't poke it. Ghost in the Shell Dr. Don Latham AJ7LL Six Mile Systems LLP 17850 Six Mile Road POB 134 Huson, MT, 59846 VOX 406-626-4304 www.lightningforensics.com www.sixmilesystems.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] Thunderbolt Monitoring for Pocket PC
Hi Justin, Great stuff. I have several iPaqs and a Thunderbolt so I will be giving this a try. I've been saving several iPaqs for just such a possibility. I'm not very adept at programming but I did manage to program a simple calculator for my iPaq using MS eMbedded several years ago just to prove I could. I saw some possibilities for using the iPaq to display data but never had the time to pursue them further. I'm currently building a LCD display for my Thunderbolt using a PIC. I'm far enough down that road to not change the design. But, I do have another case that will fit the iPaq display. Thanks to you, that may become my next project. I'm very appreciative that you posted your work. Just wanted to let you know there is interest in your work and to encourage you. tnx 73 Wayne, WA7NE -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Justin Pinnix Sent: Friday, November 25, 2011 2:56 PM To: Discussion of precise time and frequency measurement Subject: [time-nuts] Thunderbolt Monitoring for Pocket PC Nuts, A while back, I scored an old Compaq iPaq Pocket PC for cheap at an auction. Recently, I wrote a program for it that reads the time and health information from a Thunderbolt and displays it in real-time. More info available here: http://www.fuzzythinking.com/projects/thunderhead/ I may be the only guy in the world who owns both of those pieces of hardware, but in case anyone else does, please enjoy this program. Thanks, -Justin ___ 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] Thunderbolt Monitoring for Pocket PC
Hi Guys, Several questions here about models. I'll do my best to answer. I'm using an iPaq 3825, so I know for sure it works there. Robert reports success on the iPaq 2200 and 3950. Thanks Robert! I looked up the Fujitsu Siemens LOOX 420. It's an ARM type processor, so I suspect it would work on that device. Unsure about the Jornada - there were numerous models. If you don't have a serial port, that's going to be a problem. Perhaps you do and it's a matter of cabling? Which model number is yours? One of the shortcuts I took was to hardcode the serial port name to COM1:. If this presents a problem, I can make it a registry setting or maybe even cook up a dialog. If anyone tries these or other devices, please let me know how it turns out (positive or negative). Thanks, -Justin On Sat, Nov 26, 2011 at 4:16 PM, Don Latham d...@montana.com wrote: Gee. I have an old Jornada palm with windows CE. Might work if i gan generate a serial interface? Don Robert Atkinson Hi, Runs OK on both my HP iPaq H2200 (Pocket PC 2003 Ver. 4.20)and Compaq iPaq 3950 (Pocket PC 2002 Ver. 3.0) Robert G8RPI. From: Kevin Rosenberg ke...@rosenberg.net To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Saturday, 26 November 2011, 17:12 Subject: Re: [time-nuts] Thunderbolt Monitoring for Pocket PC On Nov 25, 2011, at 3:55 PM, Justin Pinnix wrote: A while back, I scored an old Compaq iPaq Pocket PC for cheap at an auction. Recently, I wrote a program for it that reads the time and health information from a Thunderbolt and displays it in real-time. More info available here: http://www.fuzzythinking.com/projects/thunderhead/ Nice project. Could you recommend some model numbers of iPaqs that would be compatible with the hardware and software? Thanks! Kevin ___ 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. -- Neither the voice of authority nor the weight of reason and argument are as significant as experiment, for thence comes quiet to the mind. R. Bacon If you don't know what it is, don't poke it. Ghost in the Shell Dr. Don Latham AJ7LL Six Mile Systems LLP 17850 Six Mile Road POB 134 Huson, MT, 59846 VOX 406-626-4304 www.lightningforensics.com www.sixmilesystems.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. ___ 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] DGPS@home
On Sat, Nov 26, 2011 at 2:35 PM, Hal Murray hmur...@megapathdsl.net wrote: Pure brute force would compute the center of mass and then scan all the data points computing the distance... That's an N-squared process which might take too long with a large clump of data. For offline research like this, it might be OK. For off line work your shrink the bounding box (or bounding ellipse) method would work fine. I think even with a few million points it is nearly trivial on a modern PC. But you can do something like this continuously in real time and keep the processing time constant. Keep a running mean of each point (actually two means as you need one for Y and one for X direction. three for Z if you include altitude. Along with the running means keep a running sigma (To do this you need keep the count N, and the sum and the sum of the squares.) Now as you get each point test if it falls outside a three sigma limit. Discard it if it does. You can play with the size and shape of the bounding box. If the robot moves then it can update the running means by dead reckoning and errors in the dead reckoned estimate will get corrected eventually by GPS GPS is never going to be exact. Or I should say you don't know the exact lat. long. for every place you want to go. So to find something like a bear bottle in your refrigerator you need vision Chris Albertson Redondo Beach, California ___ 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 Monitoring for Pocket PC
As long as you are willing to use a micro controller, I think the best way to make a status display is to have to controller maintain a web page. Then just about any pock device you own can look at the status page. Sometimes it makes sense to put an LCD on a device. I think only if the user spends time right there near the device. A microwave oven is a good example. But if the user is not there looking better i think to simply make a web page. On Sat, Nov 26, 2011 at 6:45 PM, WA7NE wa...@att.net wrote: Hi Justin, Great stuff. I have several iPaqs and a Thunderbolt so I will be giving this a try. I've been saving several iPaqs for just such a possibility. I'm not very adept at programming but I did manage to program a simple calculator for my iPaq using MS eMbedded several years ago just to prove I could. I saw some possibilities for using the iPaq to display data but never had the time to pursue them further. I'm currently building a LCD display for my Thunderbolt using a PIC. I'm far enough down that road to not change the design. But, I do have another case that will fit the iPaq display. Thanks to you, that may become my next project. I'm very appreciative that you posted your work. Just wanted to let you know there is interest in your work and to encourage you. tnx 73 Wayne, WA7NE -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Justin Pinnix Sent: Friday, November 25, 2011 2:56 PM To: Discussion of precise time and frequency measurement Subject: [time-nuts] Thunderbolt Monitoring for Pocket PC Nuts, A while back, I scored an old Compaq iPaq Pocket PC for cheap at an auction. Recently, I wrote a program for it that reads the time and health information from a Thunderbolt and displays it in real-time. More info available here: http://www.fuzzythinking.com/projects/thunderhead/ I may be the only guy in the world who owns both of those pieces of hardware, but in case anyone else does, please enjoy this program. Thanks, -Justin ___ 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. -- Chris Albertson Redondo Beach, California ___ 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] DGPS@home
Or an alcohol sensor ! BillWB6BNQ Chris Albertson wrote: snip GPS is never going to be exact. Or I should say you don't know the exact lat. long. for every place you want to go. So to find something like a bear bottle in your refrigerator you need vision Chris Albertson Redondo Beach, California ___ 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 Monitoring for Pocket PC
Hi Justin: Unsure about the Jornada - there were numerous models. If you don't have a serial port, that's going to be a problem. Perhaps you do and it's a matter of cabling? Which model number is yours? I have a 568, and there is a serial cable, also USB for sync. I can try it out when I get the cable. Don -- Neither the voice of authority nor the weight of reason and argument are as significant as experiment, for thence comes quiet to the mind. R. Bacon If you don't know what it is, don't poke it. Ghost in the Shell Dr. Don Latham AJ7LL Six Mile Systems LLP 17850 Six Mile Road POB 134 Huson, MT, 59846 VOX 406-626-4304 www.lightningforensics.com www.sixmilesystems.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.
