Re: [time-nuts] (no subject)
On Aug 19, 2010, at 7:13 PM, Bob Camp wrote: > Hopefully they will keep GPS running long enough for me to find something to > compare it to. My new GPSDO leaves me with the question of "how do I measure the phase noise of what is by far the best oscillator I own... without buying a better one to compare it to". That question is what brought me to time-nuts. I'm starting to read some papers on oscillator characterization that are collected together in a technical note from NIST that a co-worker pointed me towards, but some of them are giving me a math-induced headache. :) -- Mark J. Blair, NF6X Web page: http://www.nf6x.net/ GnuPG public key available from my web 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.
Re: [time-nuts] (no subject)
Hi Oh, you mean like my ever trusty color burst sub-carrier reference Or my Omega receiver Or my Loran C box Hopefully they will keep GPS running long enough for me to find something to compare it to. Bob On Aug 19, 2010, at 9:42 PM, "Didier Juges" wrote: > "I haven't fabricated a good excuse to want my own rubidium standard yet, but > I'll keep working on that. :)" > > Well, you need another reference that does not use the same principles to > check your first reference against. > > That one worked for me. > > Now I am working on the next one, because "a man with two clocks..." > > Didier KO4BB > > > > Sent from my BlackBerry Wireless thingy while I do other things... > > -Original Message- > From: "Mark J. Blair" > Sender: time-nuts-boun...@febo.com > Date: Thu, 19 Aug 2010 17:23:59 > To: Discussion of precise time and frequency measurement > Reply-To: Discussion of precise time and frequency measurement > > Subject: Re: [time-nuts] (no subject) > > > On Aug 19, 2010, at 4:54 PM, Bob Camp wrote: >> Yup, the original question was "why a TBolt?" > > I just joined time-nuts today, so please forgive me if I'm beating a dead > horse. For me, the answer to "why a TBolt" was "it automatically calibrates > itself against somebody else's well-maintained cesium beam oscillator that I > didn't have to pay for", along with "(presumably) low phase-noise OCXO > output", which interests me for radio-related applications. I might have > chosen a different kind of reference for a different application. > > I haven't fabricated a good excuse to want my own rubidium standard yet, but > I'll keep working on that. :) > > -- > Mark J. Blair, NF6X > Web page: http://www.nf6x.net/ > GnuPG public key available from my web 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. > ___ 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 subject)
On Aug 19, 2010, at 6:42 PM, Didier Juges wrote: > Well, you need another reference that does not use the same principles to > check your first reference against. > > That one worked for me. Ooooh, good one! > Now I am working on the next one, because "a man with two clocks..." "...needs a third one to cancel out systematic errors?" Or how about "Chicks dig guys with stable frequency and time references". :-) -- Mark J. Blair, NF6X Web page: http://www.nf6x.net/ GnuPG public key available from my web 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.
Re: [time-nuts] (no subject)
"I haven't fabricated a good excuse to want my own rubidium standard yet, but I'll keep working on that. :)" Well, you need another reference that does not use the same principles to check your first reference against. That one worked for me. Now I am working on the next one, because "a man with two clocks..." Didier KO4BB Sent from my BlackBerry Wireless thingy while I do other things... -Original Message- From: "Mark J. Blair" Sender: time-nuts-boun...@febo.com Date: Thu, 19 Aug 2010 17:23:59 To: Discussion of precise time and frequency measurement Reply-To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] (no subject) On Aug 19, 2010, at 4:54 PM, Bob Camp wrote: > Yup, the original question was "why a TBolt?" I just joined time-nuts today, so please forgive me if I'm beating a dead horse. For me, the answer to "why a TBolt" was "it automatically calibrates itself against somebody else's well-maintained cesium beam oscillator that I didn't have to pay for", along with "(presumably) low phase-noise OCXO output", which interests me for radio-related applications. I might have chosen a different kind of reference for a different application. I haven't fabricated a good excuse to want my own rubidium standard yet, but I'll keep working on that. :) -- Mark J. Blair, NF6X Web page: http://www.nf6x.net/ GnuPG public key available from my web 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] (no subject)
On Aug 19, 2010, at 4:54 PM, Bob Camp wrote: > Yup, the original question was "why a TBolt?" I just joined time-nuts today, so please forgive me if I'm beating a dead horse. For me, the answer to "why a TBolt" was "it automatically calibrates itself against somebody else's well-maintained cesium beam oscillator that I didn't have to pay for", along with "(presumably) low phase-noise OCXO output", which interests me for radio-related applications. I might have chosen a different kind of reference for a different application. I haven't fabricated a good excuse to want my own rubidium standard yet, but I'll keep working on that. :) -- Mark J. Blair, NF6X Web page: http://www.nf6x.net/ GnuPG public key available from my web 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.
Re: [time-nuts] Different Survey Results
Hi To get to "auto calibrate" hit a & and then it's the "A" option (Autotune rather than auto calibrate). Sorry for the confusion. Bob -- From: "Bob Camp" Sent: Thursday, August 19, 2010 5:10 PM To: "'Discussion of precise time and frequency measurement'" Subject: Re: [time-nuts] Different Survey Results Hi A few other things to try / consider: 1) Hit the "auto calibrate" function in LH to calibrate the slope of the OCXO, it will also load some damping and time constant stuff that you may want to overwrite. I don't know if this is a "beta only" feature or not. 2) Make sure that the TBolt isn't getting hit with drafts. Something as simple as a shoe box over it can help things quite a bit. 3) The +12 supply is fairly critical. Good regulation and low noise help stability 4) Clear view of the sky to the south (northern hemisphere) or north (southern hemisphere) helps the antenna a lot. Higher is usually better for GPS antennas. 5) The OCXO will run quite a bit better after it's been on for a while. How long depends on the one you have and how long it's been off. A few days to a few weeks may be involved. 6) Monitoring what's going on with long term charts on LH is very useful to diagnose specific issues. Lots of things to play with. None of it likely to cost much, other than some of your time. Bob -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Peter Krengel Sent: Thursday, August 19, 2010 12:29 PM To: time-nuts@febo.com Subject: [time-nuts] Different Survey Results Hello, I'm new to the list and to the themes at all. I'm running a V3 Thunderbolt using the great Lady Heather Software (thanks for this). Setting up the tbold for the first time I made a 48h survey. To compare the results I also started a SirF III GPS using VisualGPS software and after the 48h period I got totally different results. Knowing my real geografic coordinates very well I saw that the tbold obviously calculated wrong data. So my questions to the group are: 1. For getting best disciplining results out of the tbold: Do I better put in the coordinates manualy or using the survey function? 2. Is it necessary to modify DAC and temperature settings using command line options (or using the heather) or does tbold work best with factory settings? 3. Is there any "How to.." pdf or book on the net which comes with more informations about the tbold experiences than the well known official pdf from 2003 ? Thank you very much for help. 73 from germany Peter Krengel DG4EK ___ 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] (no subject)
Hi Yup, the original question was "why a TBolt?" Bob -- From: "Stanley Reynolds" Sent: Thursday, August 19, 2010 6:51 PM To: ; "Discussion of precise time and frequency measurement" Subject: Re: [time-nuts] (no subject) My crystal ball indicates the comparison is used Lpro and used Tbolt, original poster wanted to know why expend $100 for Tbolt when Lpro is cheaper. Stanley From: Dan Rae To: Discussion of precise time and frequency measurement Sent: Thu, August 19, 2010 4:56:41 PM Subject: Re: [time-nuts] (no subject) Bob Camp wrote: Hi Simple answer - they self calibrate to < 1x10^-13 at a one day time period. Essentially zero long term drift. Bob Have I missed something? A self calibrating cheap Rb unit? a self calibrating 10811? I really must wake up :^) dr -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Mark2 Sent: Thursday, August 19, 2010 4:49 PM To: time-nuts@febo.com Subject: [time-nuts] (no subject) Sure they're good but other than it's a really cool and stable oscillator why is everyone bothering with these when you can get a decent LPRO Rubidium for the same or less . It at lest ten times more stable than the HP oven job. I just bought 5 good LPROs on Ebay for about $200.00 plus shipping... Mark ___ 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. ___ 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] (no subject)
My crystal ball indicates the comparison is used Lpro and used Tbolt, original poster wanted to know why expend $100 for Tbolt when Lpro is cheaper. Stanley From: Dan Rae To: Discussion of precise time and frequency measurement Sent: Thu, August 19, 2010 4:56:41 PM Subject: Re: [time-nuts] (no subject) Bob Camp wrote: > Hi > > Simple answer - they self calibrate to < 1x10^-13 at a one day time period. > Essentially zero long term drift. > > Bob > > Have I missed something? A self calibrating cheap Rb unit? a self calibrating 10811? I really must wake up :^) dr > -Original Message- > From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On > Behalf Of Mark2 > Sent: Thursday, August 19, 2010 4:49 PM > To: time-nuts@febo.com > Subject: [time-nuts] (no subject) > > Sure they're good but other than it's a really cool and stable oscillator > why is everyone bothering with these when you can get a decent LPRO Rubidium > for the same or less . It at lest ten times more stable than the HP oven > job. I just bought 5 good LPROs on Ebay for about $200.00 plus shipping... > > Mark > ___ > 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. ___ 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 Survey Results
Hi Peter, Are you sure your known truth coordinates are in WGS84 datum? -- Björn > To John WA4WDL: > > The coordinates out of my current (fixed) position calculated by > the SirF GPS and the tbold during a 48h survey are different. > On a map this differences makes up a shift of up to 100m around > my true qth. With other words if I would (and could) use the tbold > as a mobile GPS I would come off road at once ;) > > ___ 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] Different Survey Results
To John WA4WDL: The coordinates out of my current (fixed) position calculated by the SirF GPS and the tbold during a 48h survey are different. On a map this differences makes up a shift of up to 100m around my true qth. With other words if I would (and could) use the tbold as a mobile GPS I would come off road at once ;) To ws: Thanks for the interesting answer and tips for modifying factory settings. My tbold works in a good stable (temperature) environment. I tried out to put it in a temp-isolated box but Osc temperature went up to about 50°C (not too hot?). Secondly I tried it without a box at normal 20°C room temperature (varying a little bit) and it showed OSC 41.75°C. What is the better choice? It also got fine antenna conditions (mostly 8 sats are recognized having signals between 38 and 48dBc) by using a roof top ceramic chip antenna (it has a inner preamp) followed by a 20dB wideband amp and about 20m coax. As I am located on a hill top it "sees" a 360° free sky down to 0° elevation. I got the following results using factory settings after cold start and 10 hours running with my true (are they really my true coords?) qth coordinates saved after self-survey: OSC ADEV 1tau 2.7E-09 1 tau 7.0E-13 My intension (of cause..) is to get the best out of the tbold in short and long term stability. The tbold isnt modified in any way running the original oscillator. What do you think ? To Mark: I too got a LPRO rubidium but it I'm not very satisfied because of the need of long time warm up after power fail and the need of a heat sink. In addition the tube wont last for ever and is used for 10(?) years... Anyway I would like to compare both tbold and Lpro if the tbold is setup best as possible. Thanks and regards Peter DG4EK ___ 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 subject)
Bob Camp wrote: Hi Simple answer - they self calibrate to < 1x10^-13 at a one day time period. Essentially zero long term drift. Bob Have I missed something? A self calibrating cheap Rb unit? a self calibrating 10811? I really must wake up :^) dr -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Mark2 Sent: Thursday, August 19, 2010 4:49 PM To: time-nuts@febo.com Subject: [time-nuts] (no subject) Sure they're good but other than it's a really cool and stable oscillator why is everyone bothering with these when you can get a decent LPRO Rubidium for the same or less . It at lest ten times more stable than the HP oven job. I just bought 5 good LPROs on Ebay for about $200.00 plus shipping... Mark ___ 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] (no subject)
Hi Simple answer - they self calibrate to < 1x10^-13 at a one day time period. Essentially zero long term drift. Bob -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Mark2 Sent: Thursday, August 19, 2010 4:49 PM To: time-nuts@febo.com Subject: [time-nuts] (no subject) Sure they're good but other than it's a really cool and stable oscillator why is everyone bothering with these when you can get a decent LPRO Rubidium for the same or less . It at lest ten times more stable than the HP oven job. I just bought 5 good LPROs on Ebay for about $200.00 plus shipping... Mark ___ 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] Different Survey Results
Hi A few other things to try / consider: 1) Hit the "auto calibrate" function in LH to calibrate the slope of the OCXO, it will also load some damping and time constant stuff that you may want to overwrite. I don't know if this is a "beta only" feature or not. 2) Make sure that the TBolt isn't getting hit with drafts. Something as simple as a shoe box over it can help things quite a bit. 3) The +12 supply is fairly critical. Good regulation and low noise help stability 4) Clear view of the sky to the south (northern hemisphere) or north (southern hemisphere) helps the antenna a lot. Higher is usually better for GPS antennas. 5) The OCXO will run quite a bit better after it's been on for a while. How long depends on the one you have and how long it's been off. A few days to a few weeks may be involved. 6) Monitoring what's going on with long term charts on LH is very useful to diagnose specific issues. Lots of things to play with. None of it likely to cost much, other than some of your time. Bob -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Peter Krengel Sent: Thursday, August 19, 2010 12:29 PM To: time-nuts@febo.com Subject: [time-nuts] Different Survey Results Hello, I'm new to the list and to the themes at all. I'm running a V3 Thunderbolt using the great Lady Heather Software (thanks for this). Setting up the tbold for the first time I made a 48h survey. To compare the results I also started a SirF III GPS using VisualGPS software and after the 48h period I got totally different results. Knowing my real geografic coordinates very well I saw that the tbold obviously calculated wrong data. So my questions to the group are: 1. For getting best disciplining results out of the tbold: Do I better put in the coordinates manualy or using the survey function? 2. Is it necessary to modify DAC and temperature settings using command line options (or using the heather) or does tbold work best with factory settings? 3. Is there any "How to.." pdf or book on the net which comes with more informations about the tbold experiences than the well known official pdf from 2003 ? Thank you very much for help. 73 from germany Peter Krengel DG4EK ___ 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] (no subject)
Hi Mark, > Sure they're good but other than it's a really cool and stable oscillator > why is everyone bothering with these when you can get a decent LPRO > Rubidium for the same or less . It at lest ten times more stable than > the HP oven job. I just bought 5 good LPROs on Ebay for about $200.00 plus > shipping... > > Mark The HP oven draw less current --> cheaper to run continously, less heat in your shack Even though RBs lifetime is longer than CSs the HP oven will likely outlive all atomic standards. The HP oven has better short term stability and less phase noise. I am sure there are more reasons... -- 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.
[time-nuts] (no subject)
Sure they're good but other than it's a really cool and stable oscillator why is everyone bothering with these when you can get a decent LPRO Rubidium for the same or less . It at lest ten times more stable than the HP oven job. I just bought 5 good LPROs on Ebay for about $200.00 plus shipping... Mark ___ 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 Survey Results
Peter asked: 2) Is it necessary to modify Tbolt settings or does tbold work best with factory settings? The answer is, for best performance you need to modify the factory setting. There has been much posted on which ones and how, but bottom line is it all depend on what your setup is and what you want it to do. It is a tradeoff to reduce the GPS short term noise and correct for the oscillator's long term noise. The best settings depend on what the noise frequencies and amplitude are in the two items and that depends on many things. The default setting for the Tbolt are meant to be used with a very GOOD antenna system and a not so good OCXO in a POOR environment. My situation is just the reverse. In one of my Tbolt units I'm using a very good OSC in a controlled constant temperature environment with a poor indoor antenna. The Default setting in this case are a disaster from a best performance standpoint. What I have found to give good general results if you do not want to fine tune your specific Tbolt unit and assuming a typical nut setup in a good environment (which includes adding some thermo mass to the Tbolt), 1) change the TC to 300, 2) the damping to 0.7 3) the Dac gain to -3.0 Hz/V, 4) the Elevation to 20 deg, 5) the AMU to 3.0 6) and then do a 24 or 48 hr survey if you are using Lady Heather or change the default survey size from 2,000 samples to more like 20,000+ samples, to a value that averages over at least 12 hrs, and have it save the location. ws *** [time-nuts] Different Survey Results Peter Krengel krengeldatec at gmx.de Thu Aug 19 16:28:52 UTC 2010 Hello, I'm new to the list and to the themes at all. I'm running a V3 Thunderbolt using the great Lady Heather Software (thanks for this). Setting up the tbold for the first time I made a 48h survey. To compare the results I also started a SirF III GPS using VisualGPS software and after the 48h period I got totally different results. Knowing my real geografic coordinates very well I saw that the tbold obviously calculated wrong data. So my questions to the group are: 1. For getting best disciplining results out of the tbold: Do I better put in the coordinates manualy or using the survey function? 2. Is it necessary to modify DAC and temperature settings using command line options (or using the heather) or does tbold work best with factory settings? 3. Is there any "How to.." pdf or book on the net which comes with more informations about the tbold experiences than the well known official pdf from 2003 ? Thank you very much for help. 73 from germany Peter Krengel DG4EK ___ 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] small cache of 74AC175 located
Hello I need 6 74act175 chips can you help?? Thanks Emmanouil Mantzaras Athens - Greece -- Original Message -- Received: Thu, 19 Aug 2010 07:22:24 PM EEST From: "Poul-Henning Kamp" To: "Time nuts" Subject: [time-nuts] small cache of 74AC175 located Purely by chance I just have located a small cache of 74AC175 and 74ACT175 chips in a private collection here in Denmark. For reasons too complicated to get into here, I cannot buy them outright, but I can probably liberate some of them to good homes, in return for good behaviour and donation of some time to a good cause. The majority of the chips are ACT, and a quick glance at the datasheet seems to indicate those have better timing specs. If anybody are still not supplied, please drop me a private email and I will see what I can arrange. Poul-Henning -- 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. ___ 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 Survey Results
What do you mean by "totally different results"? What were the readings or the differences? John WA4WDL -- From: "Peter Krengel" Sent: Thursday, August 19, 2010 12:28 PM To: Subject: [time-nuts] Different Survey Results Hello, I'm new to the list and to the themes at all. I'm running a V3 Thunderbolt using the great Lady Heather Software (thanks for this). Setting up the tbold for the first time I made a 48h survey. To compare the results I also started a SirF III GPS using VisualGPS software and after the 48h period I got totally different results. Knowing my real geografic coordinates very well I saw that the tbold obviously calculated wrong data. So my questions to the group are: 1. For getting best disciplining results out of the tbold: Do I better put in the coordinates manualy or using the survey function? 2. Is it necessary to modify DAC and temperature settings using command line options (or using the heather) or does tbold work best with factory settings? 3. Is there any "How to.." pdf or book on the net which comes with more informations about the tbold experiences than the well known official pdf from 2003 ? Thank you very much for help. 73 from germany Peter Krengel DG4EK ___ 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] Different Survey Results
Hello, I'm new to the list and to the themes at all. I'm running a V3 Thunderbolt using the great Lady Heather Software (thanks for this). Setting up the tbold for the first time I made a 48h survey. To compare the results I also started a SirF III GPS using VisualGPS software and after the 48h period I got totally different results. Knowing my real geografic coordinates very well I saw that the tbold obviously calculated wrong data. So my questions to the group are: 1. For getting best disciplining results out of the tbold: Do I better put in the coordinates manualy or using the survey function? 2. Is it necessary to modify DAC and temperature settings using command line options (or using the heather) or does tbold work best with factory settings? 3. Is there any "How to.." pdf or book on the net which comes with more informations about the tbold experiences than the well known official pdf from 2003 ? Thank you very much for help. 73 from germany Peter Krengel DG4EK ___ 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] small cache of 74AC175 located
Purely by chance I just have located a small cache of 74AC175 and 74ACT175 chips in a private collection here in Denmark. For reasons too complicated to get into here, I cannot buy them outright, but I can probably liberate some of them to good homes, in return for good behaviour and donation of some time to a good cause. The majority of the chips are ACT, and a quick glance at the datasheet seems to indicate those have better timing specs. If anybody are still not supplied, please drop me a private email and I will see what I can arrange. Poul-Henning -- 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] Small DMTD project PCBs Group Buy Update
I'd like to put my order in for 3 PICTIC boards, 2 Mixer boards and 2 DDS boards. thanks, Eric On Wed, Aug 18, 2010 at 9:27 PM, Stanley Reynolds wrote: > Just boards, 5 times 9.00 = $45 mailed payment $47.5 Paypal > two pictic, one DDS board, two mixer boards, note the PDF talks about a 3rd > pictic as an option. > > If you had another offset source no need for the DDS board. If you have Time > interval counters that are interfaced to a computer then no need for the > PicTic > boards. Guess you could use the DDS board for other projects also. > > Each mixer board has two identical channels so it would be possible to use > just > one in some applications. > > I 'm offering the boards in any combination. > > Stanley > > > > > > From: Eric Garner > To: Discussion of precise time and frequency measurement > Sent: Wed, August 18, 2010 10:58:36 PM > Subject: Re: [time-nuts] Small DMTD project PCBs Group Buy Update > > Just to be clear, the ~48 dollar total includes all of the required boards( > minus components) needed to make the dmtd setup work? > > Thanks, > Eric > > Sent from my Banana Jr. mobile device > > On Aug 18, 2010, at 1:50 PM, Stanley Reynolds > wrote: > >> Will place order in the next few days please email me with any suggested >>changes >> to the mixer or DDS boards. >> >> Stanley >> >> >> >> >> From: Stanley Reynolds >> To: time-nuts@febo.com >> Sent: Sun, August 15, 2010 3:14:50 PM >> Subject: [time-nuts] Small DMTD project PCBs Group Buy >> >> Any interest in boards at 8 USD each as before ? >> >> The project would require 2 or 3 pictic boards, 2 mixer boards, and 1 DDS >>board. >> >> >> >> 5 boards plus shipping about 47.50 usd >> >> Please email me off list with your interest. >> >> I not sure if using the pictic II vs I board will present problems for the >> software. >> >> Would also like to workout any changes to the DDS or Mixer Boards before I >>place >> >> the order. >> >> Yes I still have PICTIC II boards from the first order and other parts for >>them. >> >> 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. >> ___ >> 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. > -- --Eric _ Eric Garner ___ 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] Small DMTD project PCBs Group Buy Update
I 'm offering the boards in any combination. Ah, that's good to know. In that case I'd like to order one DDS board and two mixer boards; will supply my own TIC. My address is below. Thanks for making this possible, Jan-Derk Bakker Uilenstede 12 1183AH Amstelveen The Netherlands, Europe Phone: +31 20 6434867 PayPal: j...@lartmaker.nl ___ 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] Small DMTD project PCBs Group Buy Update
Brice, You are on the list. Will let everyone know when payment is needed, if you are using paypal no need to send payment till I can ship the boards, if by mail then should arrive after September 3. Stanley From: Heathkid To: Discussion of precise time and frequency measurement Sent: Wed, August 18, 2010 11:42:43 PM Subject: Re: [time-nuts] Small DMTD project PCBs Group Buy Update Stanley, Are you ready to accept payments for these now or are you still working out the details? I would want the 3rd PICTIC II option for the expanded DMTD. 73 Brice KA8MAV - Original Message - From: "Stanley Reynolds" To: "Discussion of precise time and frequency measurement" Sent: Thursday, August 19, 2010 12:27 AM Subject: Re: [time-nuts] Small DMTD project PCBs Group Buy Update Just boards, 5 times 9.00 = $45 mailed payment $47.5 Paypal two pictic, one DDS board, two mixer boards, note the PDF talks about a 3rd pictic as an option. If you had another offset source no need for the DDS board. If you have Time interval counters that are interfaced to a computer then no need for the PicTic boards. Guess you could use the DDS board for other projects also. Each mixer board has two identical channels so it would be possible to use just one in some applications. I 'm offering the boards in any combination. Stanley From: Eric Garner To: Discussion of precise time and frequency measurement Sent: Wed, August 18, 2010 10:58:36 PM Subject: Re: [time-nuts] Small DMTD project PCBs Group Buy Update Just to be clear, the ~48 dollar total includes all of the required boards( minus components) needed to make the dmtd setup work? Thanks, Eric Sent from my Banana Jr. mobile device On Aug 18, 2010, at 1:50 PM, Stanley Reynolds wrote: > Will place order in the next few days please email me with any suggested >changes > to the mixer or DDS boards. > > Stanley > > > > > From: Stanley Reynolds > To: time-nuts@febo.com > Sent: Sun, August 15, 2010 3:14:50 PM > Subject: [time-nuts] Small DMTD project PCBs Group Buy > > Any interest in boards at 8 USD each as before ? > > The project would require 2 or 3 pictic boards, 2 mixer boards, and 1 DDS >board. > > > > 5 boards plus shipping about 47.50 usd > > Please email me off list with your interest. > > I not sure if using the pictic II vs I board will present problems for the > software. > > Would also like to workout any changes to the DDS or Mixer Boards before I >place > > the order. > > Yes I still have PICTIC II boards from the first order and other parts for >them. > > 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. > ___ > 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. ___ 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] Tbolt and iCruse readout problem - any ideas?
Hi David, did you chked the PIC 3.3 voltage?? because it is the key point if you have garbled msg. Rgds, Ernie. -Original Message- From: Didier Juges To: Time-Nuts Sent: Thu, Aug 19, 2010 2:28 pm Subject: Re: [time-nuts] Tbolt and iCruse readout problem - any ideas? 1 in 400 have a problem, so assuming that he had at least one other complaint ould seem to imply that he sold as many as 800 units at least? That sounds omewhat high, but if true, good for him :) Didier ent from my BlackBerry Wireless thingy while I do other things... -Original Message- rom: David Bobbett ender: time-nuts-boun...@febo.com ate: Thu, 19 Aug 2010 10:20:17 o: Discussion of precise time and frequency measurement eply-To: Discussion of precise time and frequency measurement ubject: Re: [time-nuts] Tbolt and iCruse readout problem - any ideas? Further to my messages regarding this problem, I contacted Bob (aka luke.l) who replied almost immediately, saying that this has happened o around 1 in 400 iCruse units and he is working on a fix. Sort of a elief that there really is a problem and not some strange combination f events. n 19/08/2010 08:22, David Bobbett wrote: Hi Brooke, I know what you are thinking! Sadly the supply is 12.1v so there's plenty of regulator headroom, very interesting page though. I'm beginning to think that Didier's suggestion of corrupted firmware in the iCruse is the most probable explanation. Best wishes, David On 18/08/2010 16:58, Brooke Clarke wrote: > Hi David: > > What power supply voltage are you using? > http://www.prc68.com/I/ThunderBolt.shtml#iCruze > > Have Fun, > > Brooke Clarke > http://www.PRC68.com > > > David Bobbett wrote: >> Hi Didier, >> >> No - the display reads "DAC V: 0." on the iCruse LCD, all the >> other data (including temperature) displays normally and correctly. >> So it is only that part of the data which doesn't seem to be decoded >> and displayed correctly. The really odd thing is that the DAC V >> value can be seen in Tboltmon.exe, although I realise that that >> particular program also sends data to the Tbolt, which the iCruse >> does not. >> >> The reference to the RS232 resistors was in the context of the >> discussions regarding whether the values in the iCruse are correct >> - but of course if all the other data is being received correctly, >> there doesn't seem to be any logical reason why the DAC data would >> be any different. >> >> >> Thanks for the reply, but I'm still puzzled! >> >> >> David, G4IRQ >> >> >> >> >> >> On 18/08/2010 12:33, Didier Juges wrote: >>> When you say "will not display the DAC V value", do you mean the >>> display is >>> blank, or it displays garbage? >>> >>> Interestingly, the code that displays temperature and DAC voltage is >>> essentially the same, the only difference being which part of the data >>> string received from the Thunderbolt is processed, so it is hard to >>> imagine >>> why one would work and not the other, unless the data received from >>> the TB >>> is corrupted in the part that should contain the DAV value, and the >>> conversion routine fails. >>> >>> If you have doubts that the serial interface may not be working (I >>> am not >>> sure about what missing resistor you are talking about), fix that >>> first and >>> try again. >>> >>> Looking at the serial stream with a scope may help diagnose such >>> problem. >>> >>> Didier KO4BB >>> >>> -Original Message- >>> From: time-nuts-boun...@febo.com >>> [mailto:time-nuts-boun...@febo.com] On >>> Behalf Of David Bobbett >>> Sent: Wednesday, August 18, 2010 4:23 AM >>> To: time-nuts@febo.com >>> Subject: [time-nuts] Tbolt and iCruse readout problem - any ideas? >>> >>>Hi all, >>> >>> Having struggled in vain to solve this problem, I thought I would >>> make a >>> plea for help as my first posting to Time Nuts . . . so here goes! >>> >>> I have a Tbolt with v3.00 firmware which works fine with the >>> Tboltmon.exe >>> V2.60 and Lady Heather software. It also works fine with the iCruse >>> Tbolt >>> LCD monitor - except that the monitor will not display the "DAC V" >>> value, >>> all the other values are displayed without a problem. >>> The iCruse is the later version which has had the PIC voltage >>> conversion >>> done, but not the RS232 input resistor mods. >>> >>> >>> I have two questions really: >>> >>> 1) Is there a setting which I need to change in my Tbolt using >>> Tboltmon.exe >>> to get this to work? >>> >>> 2) Does anybody on Time Nuts have an iCruse which shows a negative >>> value for >>> the "DAC V"? >>> >>> >>> As far as I can see, there are 3 options: a) there is a configuration >>> problem, b) the iCruse doesn't display negative values for DAC V, >>> c) my >>> iCruse is faulty. I've pretty much run out of ideas on this one, so >>> any >>> suggestions would be greatly appreciated! >>> >>> Regards, >>> >>> David Bobbett, Milton Keynes,
Re: [time-nuts] Tbolt and iCruse readout problem - any ideas?
1 in 400 have a problem, so assuming that he had at least one other complaint would seem to imply that he sold as many as 800 units at least? That sounds somewhat high, but if true, good for him :) Didier Sent from my BlackBerry Wireless thingy while I do other things... -Original Message- From: David Bobbett Sender: time-nuts-boun...@febo.com Date: Thu, 19 Aug 2010 10:20:17 To: Discussion of precise time and frequency measurement Reply-To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Tbolt and iCruse readout problem - any ideas? Further to my messages regarding this problem, I contacted Bob (aka fluke.l) who replied almost immediately, saying that this has happened to around 1 in 400 iCruse units and he is working on a fix. Sort of a relief that there really is a problem and not some strange combination of events. On 19/08/2010 08:22, David Bobbett wrote: > Hi Brooke, > > I know what you are thinking! Sadly the supply is 12.1v so there's > plenty of regulator headroom, very interesting page though. I'm > beginning to think that Didier's suggestion of corrupted firmware in > the iCruse is the most probable explanation. > > Best wishes, > > David > > > > On 18/08/2010 16:58, Brooke Clarke wrote: >> Hi David: >> >> What power supply voltage are you using? >> http://www.prc68.com/I/ThunderBolt.shtml#iCruze >> >> Have Fun, >> >> Brooke Clarke >> http://www.PRC68.com >> >> >> David Bobbett wrote: >>> Hi Didier, >>> >>> No - the display reads "DAC V: 0." on the iCruse LCD, all the >>> other data (including temperature) displays normally and correctly. >>> So it is only that part of the data which doesn't seem to be decoded >>> and displayed correctly. The really odd thing is that the DAC V >>> value can be seen in Tboltmon.exe, although I realise that that >>> particular program also sends data to the Tbolt, which the iCruse >>> does not. >>> >>> The reference to the RS232 resistors was in the context of the >>> discussions regarding whether the values in the iCruse are correct >>> - but of course if all the other data is being received correctly, >>> there doesn't seem to be any logical reason why the DAC data would >>> be any different. >>> >>> >>> Thanks for the reply, but I'm still puzzled! >>> >>> >>> David, G4IRQ >>> >>> >>> >>> >>> >>> On 18/08/2010 12:33, Didier Juges wrote: When you say "will not display the DAC V value", do you mean the display is blank, or it displays garbage? Interestingly, the code that displays temperature and DAC voltage is essentially the same, the only difference being which part of the data string received from the Thunderbolt is processed, so it is hard to imagine why one would work and not the other, unless the data received from the TB is corrupted in the part that should contain the DAV value, and the conversion routine fails. If you have doubts that the serial interface may not be working (I am not sure about what missing resistor you are talking about), fix that first and try again. Looking at the serial stream with a scope may help diagnose such problem. Didier KO4BB -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of David Bobbett Sent: Wednesday, August 18, 2010 4:23 AM To: time-nuts@febo.com Subject: [time-nuts] Tbolt and iCruse readout problem - any ideas? Hi all, Having struggled in vain to solve this problem, I thought I would make a plea for help as my first posting to Time Nuts . . . so here goes! I have a Tbolt with v3.00 firmware which works fine with the Tboltmon.exe V2.60 and Lady Heather software. It also works fine with the iCruse Tbolt LCD monitor - except that the monitor will not display the "DAC V" value, all the other values are displayed without a problem. The iCruse is the later version which has had the PIC voltage conversion done, but not the RS232 input resistor mods. I have two questions really: 1) Is there a setting which I need to change in my Tbolt using Tboltmon.exe to get this to work? 2) Does anybody on Time Nuts have an iCruse which shows a negative value for the "DAC V"? As far as I can see, there are 3 options: a) there is a configuration problem, b) the iCruse doesn't display negative values for DAC V, c) my iCruse is faulty. I've pretty much run out of ideas on this one, so any suggestions would be greatly appreciated! Regards, David Bobbett, Milton Keynes, UK. ___ time-nuts mailing list -- time-nuts@febo.com To unsubs
Re: [time-nuts] Small DMTD project PCBs Group Buy Update
Re PIC programming -- if the volume is sufficient, Digi-Key will program PICs. The set-up fee is enough that you probably want to do at least 50-100 units to amortize the cost, but it's not too bad. That's how we handled the PIC for the TADD-2. John Heathkid wrote: Stanley, I'm not getting *any* emails from you privately. So, can you please confirm I'm on the list for a set of boards for this project (expanded system)? Also, is anyone stepping up for the PIC programming? Also, for some of the more expensive or harder to get components... would anyone be willing to do a group purchase? Thanks! 73 Brice KA8MAV - Original Message - From: "Stanley Reynolds" To: "Discussion of precise time and frequency measurement" Sent: Wednesday, August 18, 2010 4:50 PM Subject: [time-nuts] Small DMTD project PCBs Group Buy Update Will place order in the next few days please email me with any suggested changes to the mixer or DDS boards. Stanley From: Stanley Reynolds To: time-nuts@febo.com Sent: Sun, August 15, 2010 3:14:50 PM Subject: [time-nuts] Small DMTD project PCBs Group Buy Any interest in boards at 8 USD each as before ? The project would require 2 or 3 pictic boards, 2 mixer boards, and 1 DDS board. 5 boards plus shipping about 47.50 usd Please email me off list with your interest. I not sure if using the pictic II vs I board will present problems for the software. Would also like to workout any changes to the DDS or Mixer Boards before I place the order. Yes I still have PICTIC II boards from the first order and other parts for them. 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. ___ 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] GPS pcb IDs??
Hi Didier, the Trimble is a Resolution T (3.3v)user manual at the URL quoted by Stanley (Thanks again Stanley) The Synergy is Motorola UT+ Oncore (5v) and I am sure the manual for those is around somewhere but not had time to chase that yet. Please feel free to add these to your gallery...I may have some more when I get round to taking some photos Thanks and Best Wishes Alan G3NYK - Original Message - From: "Didier Juges" To: "Time-Nuts" Sent: Thursday, August 19, 2010 12:43 AM Subject: Re: [time-nuts] GPS pcb IDs?? > Alan, > > You may want to compare to those: > http://www.ko4bb.com/Timing/GPS_Pics/ > > If they do not match and you eventually find out what they are, please let me know and I will add them to my collection. > > That goes for anybody who has identified, clear pictures of GPS receiver boards, both sides preferably. > > Thanks in advance, > > Didier KO4BB > > > Sent from my BlackBerry Wireless thingy while I do other things... > > -Original Message- > From: "Alan Melia" > Sender: time-nuts-boun...@febo.com > Date: Thu, 19 Aug 2010 00:07:20 > To: Time-Nuts measurement > Reply-To: Discussion of precise time and frequency measurement > > Subject: [time-nuts] GPS pcb IDs?? > > Hi I have just acquired a couple of GPS receiver pcbs, ex Telcoms equipment. > I know a lot of htese poards were discussed so time ago on the group. Does > anyone recognise what they are and could point me at some intrormations > please. > I am afraid the flash has washed the the pics out a bit but hopefully there > is enough detail to be recognised > http://www.alan.melia.btinternet.co.uk/GPS/Trimble_top.JPG > http://www.alan.melia.btinternet.co.uk/GPS/Trimble_lower.JPG > http://www.alan.melia.btinternet.co.uk/GPS/Synergy_top.JPG > http://www.alan.melia.btinternet.co.uk/GPS/Synergy_lower.JPG > > The Trimble pcb is 2.6 by 1.25in., and the Synergy is 3.15 by 1.6 in. > > Thanks > Alan > G3NYK > > > ___ > 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] Tbolt and iCruse readout problem - any ideas?
Further to my messages regarding this problem, I contacted Bob (aka fluke.l) who replied almost immediately, saying that this has happened to around 1 in 400 iCruse units and he is working on a fix. Sort of a relief that there really is a problem and not some strange combination of events. On 19/08/2010 08:22, David Bobbett wrote: Hi Brooke, I know what you are thinking! Sadly the supply is 12.1v so there's plenty of regulator headroom, very interesting page though. I'm beginning to think that Didier's suggestion of corrupted firmware in the iCruse is the most probable explanation. Best wishes, David On 18/08/2010 16:58, Brooke Clarke wrote: Hi David: What power supply voltage are you using? http://www.prc68.com/I/ThunderBolt.shtml#iCruze Have Fun, Brooke Clarke http://www.PRC68.com David Bobbett wrote: Hi Didier, No - the display reads "DAC V: 0." on the iCruse LCD, all the other data (including temperature) displays normally and correctly. So it is only that part of the data which doesn't seem to be decoded and displayed correctly. The really odd thing is that the DAC V value can be seen in Tboltmon.exe, although I realise that that particular program also sends data to the Tbolt, which the iCruse does not. The reference to the RS232 resistors was in the context of the discussions regarding whether the values in the iCruse are correct - but of course if all the other data is being received correctly, there doesn't seem to be any logical reason why the DAC data would be any different. Thanks for the reply, but I'm still puzzled! David, G4IRQ On 18/08/2010 12:33, Didier Juges wrote: When you say "will not display the DAC V value", do you mean the display is blank, or it displays garbage? Interestingly, the code that displays temperature and DAC voltage is essentially the same, the only difference being which part of the data string received from the Thunderbolt is processed, so it is hard to imagine why one would work and not the other, unless the data received from the TB is corrupted in the part that should contain the DAV value, and the conversion routine fails. If you have doubts that the serial interface may not be working (I am not sure about what missing resistor you are talking about), fix that first and try again. Looking at the serial stream with a scope may help diagnose such problem. Didier KO4BB -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of David Bobbett Sent: Wednesday, August 18, 2010 4:23 AM To: time-nuts@febo.com Subject: [time-nuts] Tbolt and iCruse readout problem - any ideas? Hi all, Having struggled in vain to solve this problem, I thought I would make a plea for help as my first posting to Time Nuts . . . so here goes! I have a Tbolt with v3.00 firmware which works fine with the Tboltmon.exe V2.60 and Lady Heather software. It also works fine with the iCruse Tbolt LCD monitor - except that the monitor will not display the "DAC V" value, all the other values are displayed without a problem. The iCruse is the later version which has had the PIC voltage conversion done, but not the RS232 input resistor mods. I have two questions really: 1) Is there a setting which I need to change in my Tbolt using Tboltmon.exe to get this to work? 2) Does anybody on Time Nuts have an iCruse which shows a negative value for the "DAC V"? As far as I can see, there are 3 options: a) there is a configuration problem, b) the iCruse doesn't display negative values for DAC V, c) my iCruse is faulty. I've pretty much run out of ideas on this one, so any suggestions would be greatly appreciated! Regards, David Bobbett, Milton Keynes, UK. ___ 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. ___ 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
Re: [time-nuts] GPS pcb IDs??
Stanley, Thank you very much for the rapid response I will browse those URLs and see if I can id the pcbs. Didier has advised he has a gallery so we should make good progress. Thanks Alan G3NYK - Original Message - From: "Stanley Reynolds" To: "Discussion of precise time and frequency measurement" Sent: Thursday, August 19, 2010 12:38 AM Subject: Re: [time-nuts] GPS pcb IDs?? Synergy Motorola info here : http://www.wa5rrn.com/GPS%20Other/Motorola%20M12/5vltb.pdf UT+ Oncore R5xxxU Customer Specials trimble resolution t http://trl.trimble.com/docushare/dsweb/Get/Document-183796/13441+Resolution+FA2.pdf http://www.dpie.com/manuals/gps/trimble/ResolutionT_072408.pdf Stanley From: Alan Melia To: Time-Nuts measurement Sent: Wed, August 18, 2010 6:07:20 PM Subject: [time-nuts] GPS pcb IDs?? Hi I have just acquired a couple of GPS receiver pcbs, ex Telcoms equipment. I know a lot of htese poards were discussed so time ago on the group. Does anyone recognise what they are and could point me at some intrormations please. I am afraid the flash has washed the the pics out a bit but hopefully there is enough detail to be recognised http://www.alan.melia.btinternet.co.uk/GPS/Trimble_top.JPG http://www.alan.melia.btinternet.co.uk/GPS/Trimble_lower.JPG http://www.alan.melia.btinternet.co.uk/GPS/Synergy_top.JPG http://www.alan.melia.btinternet.co.uk/GPS/Synergy_lower.JPG The Trimble pcb is 2.6 by 1.25in., and the Synergy is 3.15 by 1.6 in. Thanks Alan G3NYK ___ 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] GPS pcb IDs??
Thanks Didier I will certainly let you know the results Alan - Original Message - From: "Didier Juges" To: "Time-Nuts" Sent: Thursday, August 19, 2010 12:43 AM Subject: Re: [time-nuts] GPS pcb IDs?? > Alan, > > You may want to compare to those: > http://www.ko4bb.com/Timing/GPS_Pics/ > > If they do not match and you eventually find out what they are, please let me know and I will add them to my collection. > > That goes for anybody who has identified, clear pictures of GPS receiver boards, both sides preferably. > > Thanks in advance, > > Didier KO4BB > > > Sent from my BlackBerry Wireless thingy while I do other things... > > -Original Message- > From: "Alan Melia" > Sender: time-nuts-boun...@febo.com > Date: Thu, 19 Aug 2010 00:07:20 > To: Time-Nuts measurement > Reply-To: Discussion of precise time and frequency measurement > > Subject: [time-nuts] GPS pcb IDs?? > > Hi I have just acquired a couple of GPS receiver pcbs, ex Telcoms equipment. > I know a lot of htese poards were discussed so time ago on the group. Does > anyone recognise what they are and could point me at some intrormations > please. > I am afraid the flash has washed the the pics out a bit but hopefully there > is enough detail to be recognised > http://www.alan.melia.btinternet.co.uk/GPS/Trimble_top.JPG > http://www.alan.melia.btinternet.co.uk/GPS/Trimble_lower.JPG > http://www.alan.melia.btinternet.co.uk/GPS/Synergy_top.JPG > http://www.alan.melia.btinternet.co.uk/GPS/Synergy_lower.JPG > > The Trimble pcb is 2.6 by 1.25in., and the Synergy is 3.15 by 1.6 in. > > Thanks > Alan > G3NYK > > > ___ > 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] Tbolt and iCruse readout problem - any ideas?
Hi Brooke, I know what you are thinking! Sadly the supply is 12.1v so there's plenty of regulator headroom, very interesting page though. I'm beginning to think that Didier's suggestion of corrupted firmware in the iCruse is the most probable explanation. Best wishes, David On 18/08/2010 16:58, Brooke Clarke wrote: Hi David: What power supply voltage are you using? http://www.prc68.com/I/ThunderBolt.shtml#iCruze Have Fun, Brooke Clarke http://www.PRC68.com David Bobbett wrote: Hi Didier, No - the display reads "DAC V: 0." on the iCruse LCD, all the other data (including temperature) displays normally and correctly. So it is only that part of the data which doesn't seem to be decoded and displayed correctly. The really odd thing is that the DAC V value can be seen in Tboltmon.exe, although I realise that that particular program also sends data to the Tbolt, which the iCruse does not. The reference to the RS232 resistors was in the context of the discussions regarding whether the values in the iCruse are correct - but of course if all the other data is being received correctly, there doesn't seem to be any logical reason why the DAC data would be any different. Thanks for the reply, but I'm still puzzled! David, G4IRQ On 18/08/2010 12:33, Didier Juges wrote: When you say "will not display the DAC V value", do you mean the display is blank, or it displays garbage? Interestingly, the code that displays temperature and DAC voltage is essentially the same, the only difference being which part of the data string received from the Thunderbolt is processed, so it is hard to imagine why one would work and not the other, unless the data received from the TB is corrupted in the part that should contain the DAV value, and the conversion routine fails. If you have doubts that the serial interface may not be working (I am not sure about what missing resistor you are talking about), fix that first and try again. Looking at the serial stream with a scope may help diagnose such problem. Didier KO4BB -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of David Bobbett Sent: Wednesday, August 18, 2010 4:23 AM To: time-nuts@febo.com Subject: [time-nuts] Tbolt and iCruse readout problem - any ideas? Hi all, Having struggled in vain to solve this problem, I thought I would make a plea for help as my first posting to Time Nuts . . . so here goes! I have a Tbolt with v3.00 firmware which works fine with the Tboltmon.exe V2.60 and Lady Heather software. It also works fine with the iCruse Tbolt LCD monitor - except that the monitor will not display the "DAC V" value, all the other values are displayed without a problem. The iCruse is the later version which has had the PIC voltage conversion done, but not the RS232 input resistor mods. I have two questions really: 1) Is there a setting which I need to change in my Tbolt using Tboltmon.exe to get this to work? 2) Does anybody on Time Nuts have an iCruse which shows a negative value for the "DAC V"? As far as I can see, there are 3 options: a) there is a configuration problem, b) the iCruse doesn't display negative values for DAC V, c) my iCruse is faulty. I've pretty much run out of ideas on this one, so any suggestions would be greatly appreciated! Regards, David Bobbett, Milton Keynes, UK. ___ 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. ___ 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.
