Re: [time-nuts] Star Box
Hi Joe, On 08/16/2013 04:47 AM, Joseph Gray wrote: I just picked up a Star Box for $10. It has an Allstar DGPS board inside. I saw several mentions of similar boards in the archives and I have found some documentation on the net. Has anyone actually used one of these in a GPSDO? Does it work any better than the usual Motorola, Rockwell, or other available boards? The other thought is, since this is a DGPS board, how difficult would it be to use it to obtain a more accurate position fix? Or do I need other GPS boards to correlate this one with? I'll admit that so far, I have only skimmed the documentation that I downloaded. If I need to RTFM for my answers, just tell me so. Some data on what I have: Star Box Part No. 100-600304-100 (DGPS Base Station option is checked) Inside the box is a carrier board that has a power supply and an RS-232 TX/RX chip. The GPS board that plugs onto the carrier has a label on the underside that says VAR 100. This corresponds to the suffix of the part number on the box. The top side of the GPS board has the GPS receiver in a large metal box that is imbossed ALLSTAR 12 and CMC, which is the manufacturer (since then bought by Novatel?). Grab the manual, set it on self-survey and you have a nice little receiver. Since it does both code and carrier phase, you have added precision. Since it is a DGPS base station, it naturally have a built-in self-surveying using the power of that combined tracking. Hook it up to a good choke-ring, it deserves it. Multipath is what kills precision for this one. It will output DGPS corrections, such that any other DGPS receiving GPS you have can quickly acquire accurate lock, but you need to provide a link for the RTCM messages. Love to have one even if I have similar stuff. Cheers, Magnus ___ 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] My GPSDO project: OCXO Thermal Oscillation?
Hi On Aug 16, 2013, at 8:42 PM, Bob Stewart b...@evoria.net wrote: I thought I could just re-enter the numbers from the last survey I did. But either something is wrong or I'm missing something (betting on the latter). I can't seem to enable TRAIM. I thought I had it setup just like previously, but under WinCore12 it simply won't turn it on. So, I'm just letting it do a survey again, I guess. IOW, I dunno. If: 1) you have the numbers in the right format 2) they came from a long enough survey 3) they came from the same card 4) you have the right commands Yes you can push them into the card. For the rest of us, it's off to survey land. For quick testing you can use a short survey. If you are looking at 24 hour runs, then you need a good survey. And I have a question about MATH functions on the 5335A, if you don't mind. (I'm an HP newbie.) Is there away to use Ratio A/B and have it give a greater resolution than a whole number, perhaps by having it average over multiple B ticks? not really. They just take a very standard reading on each channel and do simple math on it. There's no resolution increase. To do a full ratio very near 10 MHz, use one of the signals as the reference to the counter. Still no real resolution increase, but a cool thing to do. To get more resolution, put it in start / stop gate mode and run really long gate times. The easy way to time it and run it is via the GPIB. You fairly quickly find out that the internal counters overflow and 10 MHz goes to 5 MHz then to 2.5 MHz on the display. It's the top end overflowing so the stuff you are after (the LSB's) are still fine. It does mess up the nifty math function you spent all that time punching in though. Since you are likely running via GPIB at this point correcting things is a couple lines of code. I think I figured out how to enter an Offset, but I just get the ratio in single digits which doesn't really give me anything. first do a subtract to remove the 10 MHz likely by entering OFFSET CHS 1 EEX 7 ENTER next make sure it looks right on the display, likely 0.123 or 1.23E-4 after that put in the scaling factor. For 10 MHz it's just a decimal shift for 16.384 MHz it would be a bit more complex (and even more useful) likely key strokes are SCALE 1 E CHS 7 ENTER (CHS location could be off) Bob Bob From: Bob Camp li...@rtty.us To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Friday, August 16, 2013 7:26 PM Subject: Re: [time-nuts] My GPSDO project: OCXO Thermal Oscillation? Hi Also remember - you need to do a survey on the UT+ and put it into position hold / timing mode. If you don't you can add a bit more to your error budget. Bob On Aug 16, 2013, at 7:58 PM, Bob Stewart b...@evoria.net wrote: I'll figure out something. I'm thinking of icing down my DDS device to put it at a known temperature so I can do drift comparisons. If not that, there'll be something else I can try. On another note: I thought I had destroyed everything when I swapped the UT+ back into the GPSDO. Fortunately it was just that the UT+ needed to be reset, and I had destroyed a USB-TTL adapter and not my new little Adafruit. I'm going to have to figure out exactly what command sequence needs to be sent to the UT+ to get the comms working again and write a short program to do it. For some reason the WinCore12 program wasn't able to bring it up. Bob From: Angus not.ag...@btinternet.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Friday, August 16, 2013 6:14 PM Subject: Re: [time-nuts] My GPSDO project: OCXO Thermal Oscillation? Hi, To be able to test GPSDO's (and GPS in general) was one of the main reasons that I made a temp controlled chassis for an LPRO and gave it air pressure compensation. That was good for tau's of hundreds to tens of thousands of seconds, and even longer with drift compensation. Add in a clean-up oscillator if desired, and you have a pretty good reference. Incidentally, I tested 2 FEI5680A's, a Temex LPFRS and 3 LPRO's in this type of setup, but only the LPRO's allowed the air pressure effects to be almost completely cancelled out. For some reason the others did not react to fluctuating air pressure as predictably. Angus. From: Bob Camp To: Discussion of precise time and frequency measurement Sent: August 16, 2013 7:45 PM Subject: Re: [time-nuts] My GPSDO project: OCXO Thermal Oscillation? Hi With the 5335 you have a measurement with dead time. That makes things a bit hard to figure out. A much better way to go is to feed a pair of 1 pps signals into the 5335 and measure their time difference. Unless they are quite close, you can go for a while with no ambiguity to the reading. The effective resolution increases
Re: [time-nuts] RFTGm-II-Rb - can you gps discipline it without the XO module?
Hi Alan, the one I used was a Oncore UT. The message needed for the RFTG is @@Ea.. once a second if I remember correctly. Note that the RFTG doesn't talk to the UT, it just listens, so you will need to initiate the messages somehow. There's also some windows diagnostic software for the RFTG on ko4bb's archive. Have fun Guido Von Samsung Mobile gesendet Alan Kamrowski II ala...@earthlink.net hat geschrieben: Hi Guido, Been there, done that. The RFTGm-RB can be disciplined if you connect the pps and the gps data stream coming from a motorola Oncore. Regards Guido I've pulled it apart and the board does show a connection to the EXT C-FIELD. That trace runs to a jumper labeled A C B and currently C B is shunted. Any particular Motorola oncore model required - I see a bunch of them on Ebay... Thanks, Alan -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Guido Küppers Sent: Friday, August 16, 2013 3:29 AM To: Rex; Discussion of precise time and frequency measurement Subject: Re: [time-nuts] RFTGm-II-Rb - can you gps discipline it without the XO module? Von Samsung Mobile gesendet Rex r...@sonic.net hat geschrieben: I don't think the rubidium module for these systems can be disciplined. I think they were only intended as a backup if the XO section or GPS failed. The XO section does discipline but I don't know the details. I'm not sure of the model number, Lucent had several variations on the same theme in that time frame. I had one of the rubidiums that may be the same as yours. Trying to trace out some of the circuits, I found that the EFC on the LPRO connector was not being used at all. On 8/15/2013 7:52 AM, Alan Kamrowski II wrote: Hi Everyone, I've only got the RFTGm-II-Rb module. I found an interface cable specification here: http://www.ko4bb.com/Manuals/05%29_GPS_Timing/RFTG-m/RFTGm%20Interface %20Cab le.pdf Does anyone know if feeding a 1pps signal to pin 9 might discipline it? Or does it need the other connections such as GPS data, etc. Is there a ground on this connector? 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. ___ 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] My GPSDO project: OCXO Thermal Oscillation?
Hi If one of your sources can be offset (it's a DDS) then mixing the two is a good way to increase the resolution. Separate the two by a couple Hz and feed them into a double balanced mixer. Run the beat note into an amp and limiter. Output of the limiter drives the 5335. Resolution goes up by 10^7 if you are at 1 Hz. The gotcha is that you can't use all the resolution you gain due to noise. The old style approach was to use a pair of OP-37 op amps, the first as a ~ 10X gain amp. The second as an inverting limiter. Simple R/C filters were used both as high pass and low pass on the signal ahead of the limiter. There is a simple / non-critical L/C filter between the mixer and the first amp. There are a number of other ways to do it. A Mini-Circuits RPD-1 makes a pretty good mixer for a simple setup. The whole thing can be done on perf board including the +/- 18V three terminal regulators. If you have a bit of this and that in your junk box, cost should be $50. That of course assumes you already have a lab supply to drive the regulators... Bob On Aug 16, 2013, at 8:42 PM, Bob Stewart b...@evoria.net wrote: I thought I could just re-enter the numbers from the last survey I did. But either something is wrong or I'm missing something (betting on the latter). I can't seem to enable TRAIM. I thought I had it setup just like previously, but under WinCore12 it simply won't turn it on. So, I'm just letting it do a survey again, I guess. IOW, I dunno. And I have a question about MATH functions on the 5335A, if you don't mind. (I'm an HP newbie.) Is there away to use Ratio A/B and have it give a greater resolution than a whole number, perhaps by having it average over multiple B ticks? I think I figured out how to enter an Offset, but I just get the ratio in single digits which doesn't really give me anything. Bob From: Bob Camp li...@rtty.us To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Friday, August 16, 2013 7:26 PM Subject: Re: [time-nuts] My GPSDO project: OCXO Thermal Oscillation? Hi Also remember - you need to do a survey on the UT+ and put it into position hold / timing mode. If you don't you can add a bit more to your error budget. Bob On Aug 16, 2013, at 7:58 PM, Bob Stewart b...@evoria.net wrote: I'll figure out something. I'm thinking of icing down my DDS device to put it at a known temperature so I can do drift comparisons. If not that, there'll be something else I can try. On another note: I thought I had destroyed everything when I swapped the UT+ back into the GPSDO. Fortunately it was just that the UT+ needed to be reset, and I had destroyed a USB-TTL adapter and not my new little Adafruit. I'm going to have to figure out exactly what command sequence needs to be sent to the UT+ to get the comms working again and write a short program to do it. For some reason the WinCore12 program wasn't able to bring it up. Bob From: Angus not.ag...@btinternet.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Friday, August 16, 2013 6:14 PM Subject: Re: [time-nuts] My GPSDO project: OCXO Thermal Oscillation? Hi, To be able to test GPSDO's (and GPS in general) was one of the main reasons that I made a temp controlled chassis for an LPRO and gave it air pressure compensation. That was good for tau's of hundreds to tens of thousands of seconds, and even longer with drift compensation. Add in a clean-up oscillator if desired, and you have a pretty good reference. Incidentally, I tested 2 FEI5680A's, a Temex LPFRS and 3 LPRO's in this type of setup, but only the LPRO's allowed the air pressure effects to be almost completely cancelled out. For some reason the others did not react to fluctuating air pressure as predictably. Angus. From: Bob Camp To: Discussion of precise time and frequency measurement Sent: August 16, 2013 7:45 PM Subject: Re: [time-nuts] My GPSDO project: OCXO Thermal Oscillation? Hi With the 5335 you have a measurement with dead time. That makes things a bit hard to figure out. A much better way to go is to feed a pair of 1 pps signals into the 5335 and measure their time difference. Unless they are quite close, you can go for a while with no ambiguity to the reading. The effective resolution increases linearly with the time length of the observation. There also are a number of very nice programs that will let you collect the data from the 5335 via GPIB. Assuming your 5335 works like mine does it's got about a 1 ns resolution at 1 second. It'll give you 1 ppb at a 1 second gate and 1 ppt at a 1,000 second gate. By the time it gets to 1,000 seconds the internal counters have overflowed and the reading is a bit messed up. Without some sort of accurate reference,
Re: [time-nuts] RFTGm-II-Rb - can you gps discipline it without the XO module?
Hi Guido, the one I used was a Oncore UT. The message needed for the RFTG is @@Ea.. So if I send the bytes: @@Ea.. it will accept the 1pps pulse? Any idea on the baud rate, 9600 N 8 1 ? Thanks for your help Alan ___ 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] RFTGm-II-Rb - can you gps discipline it without the XO module?
Hi Guido, I found a manual here: http://www.elgps.com/public_ftp/Documentos/SIRF_Protocol.pdf I don't see the @@Ea.. sequence anywhere. Is it NMEA or SIRF Binary? Any more tips before I try this? Thanks, Alan ___ 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] RFTGm-II-Rb - can you gps discipline it without the XO module?
Hi Alan, sorry for my misleading comment. What I meant was the RFTG will need @@Ea messages coming from the UT. They contain the necessary gps data for the RFTG to accept the pps pulse. You initiate on the UT by sending it a @@Ea request. This has to be done for example y a PC running the motorola control software. Look it up in the UT manual. As I said the RFTG will just listen to incoming gps messages, because normally the RFTGm-Rb will run in tandem with an RFTGm-XO which takes care of talking to its inbuilt UT and passes the messages to the RFTGm-RB. What else? @@Ea messages should be configured to be sent once a second. The RFTG will need to receive at least one additional message stating that position data is valid and search mode has finished successfully. Again, look it up in the UT manual. I've found these things out by trial and error, sorry to be not more specific. 9600 8N1 will do nicely and is the default. Have fun, Guido Von Samsung Mobile gesendet Alan Kamrowski II ala...@earthlink.net hat geschrieben: Hi Guido, the one I used was a Oncore UT. The message needed for the RFTG is @@Ea.. So if I send the bytes: @@Ea.. it will accept the 1pps pulse? Any idea on the baud rate, 9600 N 8 1 ? Thanks for your help Alan ___ 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] RFTGm-II-Rb - can you gps discipline it without the XO module?
Hi Guido, So you didn't fake the data from the UT, you only made something to ask the UT to output it. I see some UT units on eBay, but I don't recognize the antenna connectors. I've got a small screw on antenna (SMA?), but the ones on eBay look like that small round push on like I've seen in notebook computers or something that looks like SMA, but doesn't seem to have threads - push on??? Does the UT require a specific antenna? Thanks, Alan ___ 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] RFTGm-II-Rb - can you gps discipline it without the XO module?
Alan, wrong manual, the UT doesn't talk sirf as far as I remember. Although it can do NMEA this is not what want. Try to find a manual for the motorola Oncore receivers, the commands and messages I mentioned are specific to them. Have fun, Guido Von Samsung Mobile gesendet Alan Kamrowski II ala...@earthlink.net hat geschrieben: Hi Guido, I found a manual here: http://www.elgps.com/public_ftp/Documentos/SIRF_Protocol.pdf I don't see the @@Ea.. sequence anywhere. Is it NMEA or SIRF Binary? Any more tips before I try this? Thanks, Alan ___ 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] RFTGm-II-Rb - can you gps discipline it without the XO module?
Hi All the UT cards that I have ever seen use the small push on antenna connector. I have never seen one that directly takes anything normal like an SMA or a BNC. You buy the card and then a bit of coax with the push on on one end and (normally) an SMA on the other end. The antenna for the UT is a normal 5V powered GPS antenna. Just about anything other than a +12V survey antenna will work. If you go shopping, go for one of the later cards. They work a lot better than the early ones. Bob On Aug 17, 2013, at 10:56 AM, Alan Kamrowski II ala...@earthlink.net wrote: Hi Guido, So you didn't fake the data from the UT, you only made something to ask the UT to output it. I see some UT units on eBay, but I don't recognize the antenna connectors. I've got a small screw on antenna (SMA?), but the ones on eBay look like that small round push on like I've seen in notebook computers or something that looks like SMA, but doesn't seem to have threads - push on??? Does the UT require a specific antenna? Thanks, Alan ___ 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] time-nuts Digest, Vol 109, Issue 57
Looking at the high price (and closed software) of what is currently offered, I have been thinking of making a kit of my GPSMonitor (see KO4BB.com) I think I could sell an assembled and tested kit with a 2x16 char display for $60 or so if I get 50 people interested. Of course, the source code is free. You can build your own using info on my web site. If anyone is interested, send me a private message. Didier KO4BB Russ Ramirez russ.rami...@gmail.com wrote: Hi Chris, The fundamental issue was that the same code that worked elsewhere could not decode the 0x8F-AB packet data 100% of the time. I saw the length of this packet vary by a few bits at the code level, so I used a logic analyzer with serial decode to examine the raw data coming in to the Arduino, but that was perfect 100% of the time, and thus the serial port breakout card was functioning OK as I expected. I am reasonably certain my code was fine, but there is always room for some uncertainty there. The project was not so important to me that I was going to spend the time to wrestle down the problem until it was solved. I like the Arduino platform, and because of Wiring and Processing it definitely has a place out there and have had no issues using the same UNO with XBee for example doing some neat mesh networking projects. I also have a Leonardo and a Netduino and about a dozen other micro-controller boards, but I just felt that had I used a TI or a PIC board I would have nailed this first-time with less effort. As far as a PCB goes, you're correct of course, but I already do that sort of thing and would not shy away from it. Yeah, if you can get a LH-like application, maybe optionally driving a color LCD, that would be very cool. For any of these TB apps, I agree that using a PC is overkill, but when you already have them sitting around it's not so bad. I like Adam's board, and any approach like this, because when you put together a TB and a power supply in an enclosure, you're probably going to have room to add a control panel and I think it makes for a nice self-contained solution. Russ What was the problem you found. Other then a new to you platform? I'm trying to understand why reading serial data would be hard. An advantage of the Adruino is that you don't need to make a PCB. Even if you want to do something like add a graphical display or and SD card for logging they just plug in, no solder required. Of course the pre-buillt display is even easier but can't be modified. One of my loner term goals is to move lady heather like functions onto a small uP based device. It seems wasteful to use a PC for this. ___ 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. -- Sent from my Motorola Droid Razr 4G LTE wireless tracker while I do other things. ___ 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] time-nuts Digest, Vol 109, Issue 57
$60 seems high. Yes I understand why you'd have to charge that much for a low volume run. but an Arduino-like device costs $30 and TI sells their MSP430 Launch Pad for $10 (shipped) and all you need to add to it is the 2x16 display and those or $6.So you could assemble something for $20. What's going on is that TI builds tens of thousands of these and sells them at cost. It is really hard to DIY a uP on a PCB for less than a LaunchPad. On Sat, Aug 17, 2013 at 8:42 AM, Didier Juges shali...@gmail.com wrote: Looking at the high price (and closed software) of what is currently offered, I have been thinking of making a kit of my GPSMonitor (see KO4BB.com) I think I could sell an assembled and tested kit with a 2x16 char display for $60 or so if I get 50 people interested. Of course, the source code is free. You can build your own using info on my web site. If anyone is interested, send me a private message. Didier KO4BB Russ Ramirez russ.rami...@gmail.com wrote: Hi Chris, The fundamental issue was that the same code that worked elsewhere could not decode the 0x8F-AB packet data 100% of the time. I saw the length of this packet vary by a few bits at the code level, so I used a logic analyzer with serial decode to examine the raw data coming in to the Arduino, but that was perfect 100% of the time, and thus the serial port breakout card was functioning OK as I expected. I am reasonably certain my code was fine, but there is always room for some uncertainty there. The project was not so important to me that I was going to spend the time to wrestle down the problem until it was solved. I like the Arduino platform, and because of Wiring and Processing it definitely has a place out there and have had no issues using the same UNO with XBee for example doing some neat mesh networking projects. I also have a Leonardo and a Netduino and about a dozen other micro-controller boards, but I just felt that had I used a TI or a PIC board I would have nailed this first-time with less effort. As far as a PCB goes, you're correct of course, but I already do that sort of thing and would not shy away from it. Yeah, if you can get a LH-like application, maybe optionally driving a color LCD, that would be very cool. For any of these TB apps, I agree that using a PC is overkill, but when you already have them sitting around it's not so bad. I like Adam's board, and any approach like this, because when you put together a TB and a power supply in an enclosure, you're probably going to have room to add a control panel and I think it makes for a nice self-contained solution. Russ What was the problem you found. Other then a new to you platform? I'm trying to understand why reading serial data would be hard. An advantage of the Adruino is that you don't need to make a PCB. Even if you want to do something like add a graphical display or and SD card for logging they just plug in, no solder required. Of course the pre-buillt display is even easier but can't be modified. One of my loner term goals is to move lady heather like functions onto a small uP based device. It seems wasteful to use a PC for this. ___ 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. -- Sent from my Motorola Droid Razr 4G LTE wireless tracker while I do other things. ___ 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] time-nuts Digest, Vol 109, Issue 57
On 8/17/2013 5:52 PM, Chris Albertson wrote: /TI sells their MSP430 Launch Pad for $10 (shipped)/ Much better than that. TI has reduced the price of the EK-LM4F120XL Stellaris LM4F120 LaunchPad Evaluation Board which now costs USD 7.99 shipped... And that board sports a Stellaris LM4F120H5QR processor, an ARM Cortex M4F, much more powerful than an Arduino. Add to this that the Keil development environment has a free version, limited to 32kB of code, and this a combination hard to beat... look here : https://estore.ti.com/Stellaris-LaunchPad.aspx 73 Alberto I2PHD ___ 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] time-nuts Digest, Vol 109, Issue 57
I agree with Chris. Though the effort in the software has to account for something. I have 3 of the TIs when they were on sale even cheaper $7 as I recall. But that said. I have not had time to do anything with them. Nor half a dozen other things. So adding a display would be very reasonable. But the coding that is the real job. Regards Paul. On Sat, Aug 17, 2013 at 11:52 AM, Chris Albertson albertson.ch...@gmail.com wrote: $60 seems high. Yes I understand why you'd have to charge that much for a low volume run. but an Arduino-like device costs $30 and TI sells their MSP430 Launch Pad for $10 (shipped) and all you need to add to it is the 2x16 display and those or $6.So you could assemble something for $20. What's going on is that TI builds tens of thousands of these and sells them at cost. It is really hard to DIY a uP on a PCB for less than a LaunchPad. On Sat, Aug 17, 2013 at 8:42 AM, Didier Juges shali...@gmail.com wrote: Looking at the high price (and closed software) of what is currently offered, I have been thinking of making a kit of my GPSMonitor (see KO4BB.com) I think I could sell an assembled and tested kit with a 2x16 char display for $60 or so if I get 50 people interested. Of course, the source code is free. You can build your own using info on my web site. If anyone is interested, send me a private message. Didier KO4BB Russ Ramirez russ.rami...@gmail.com wrote: Hi Chris, The fundamental issue was that the same code that worked elsewhere could not decode the 0x8F-AB packet data 100% of the time. I saw the length of this packet vary by a few bits at the code level, so I used a logic analyzer with serial decode to examine the raw data coming in to the Arduino, but that was perfect 100% of the time, and thus the serial port breakout card was functioning OK as I expected. I am reasonably certain my code was fine, but there is always room for some uncertainty there. The project was not so important to me that I was going to spend the time to wrestle down the problem until it was solved. I like the Arduino platform, and because of Wiring and Processing it definitely has a place out there and have had no issues using the same UNO with XBee for example doing some neat mesh networking projects. I also have a Leonardo and a Netduino and about a dozen other micro-controller boards, but I just felt that had I used a TI or a PIC board I would have nailed this first-time with less effort. As far as a PCB goes, you're correct of course, but I already do that sort of thing and would not shy away from it. Yeah, if you can get a LH-like application, maybe optionally driving a color LCD, that would be very cool. For any of these TB apps, I agree that using a PC is overkill, but when you already have them sitting around it's not so bad. I like Adam's board, and any approach like this, because when you put together a TB and a power supply in an enclosure, you're probably going to have room to add a control panel and I think it makes for a nice self-contained solution. Russ What was the problem you found. Other then a new to you platform? I'm trying to understand why reading serial data would be hard. An advantage of the Adruino is that you don't need to make a PCB. Even if you want to do something like add a graphical display or and SD card for logging they just plug in, no solder required. Of course the pre-buillt display is even easier but can't be modified. One of my loner term goals is to move lady heather like functions onto a small uP based device. It seems wasteful to use a PC for this. ___ 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. -- Sent from my Motorola Droid Razr 4G LTE wireless tracker while I do other things. ___ 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. ___ 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] RFTGm-II-Rb - can you gps discipline it without the XO module?
Am Samstag, den 17.08.2013, 09:56 -0500 schrieb Alan Kamrowski II: Hi Guido, So you didn't fake the data from the UT, you only made something to ask the UT to output it. That´s exactly what I did, although I used the fake approach before that , when I didn't have a UT on hand. I see some UT units on eBay, but I don't recognize the antenna connectors. I've got a small screw on antenna (SMA?), but the ones on eBay look like that small round push on like I've seen in notebook computers or something that looks like SMA, but doesn't seem to have threads - push on??? Does the UT require a specific antenna? As has already been pointed out, no special antenna is needed as long as it's happy with a 5V supply. I believe I used a connector from a wifi-module of a laptop computer to put together an adapter. Aren't these called smc-connectors and come in normal and reversed fashion? Have fun, Guido ___ 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] time-nuts Digest, Vol 109, Issue 57
Hi Assuming that TI does it the same way as the rest of the world, the pricing is even more crazy. They sell the stuff at cost to below cost to get people interested in their chips. For them It's part of the marketing process rather than a profit center. Not all the demo / evaluation stuff gets done this way, but the boards we're talking about certainly do. Bob On Aug 17, 2013, at 11:52 AM, Chris Albertson albertson.ch...@gmail.com wrote: $60 seems high. Yes I understand why you'd have to charge that much for a low volume run. but an Arduino-like device costs $30 and TI sells their MSP430 Launch Pad for $10 (shipped) and all you need to add to it is the 2x16 display and those or $6.So you could assemble something for $20. What's going on is that TI builds tens of thousands of these and sells them at cost. It is really hard to DIY a uP on a PCB for less than a LaunchPad. On Sat, Aug 17, 2013 at 8:42 AM, Didier Juges shali...@gmail.com wrote: Looking at the high price (and closed software) of what is currently offered, I have been thinking of making a kit of my GPSMonitor (see KO4BB.com) I think I could sell an assembled and tested kit with a 2x16 char display for $60 or so if I get 50 people interested. Of course, the source code is free. You can build your own using info on my web site. If anyone is interested, send me a private message. Didier KO4BB Russ Ramirez russ.rami...@gmail.com wrote: Hi Chris, The fundamental issue was that the same code that worked elsewhere could not decode the 0x8F-AB packet data 100% of the time. I saw the length of this packet vary by a few bits at the code level, so I used a logic analyzer with serial decode to examine the raw data coming in to the Arduino, but that was perfect 100% of the time, and thus the serial port breakout card was functioning OK as I expected. I am reasonably certain my code was fine, but there is always room for some uncertainty there. The project was not so important to me that I was going to spend the time to wrestle down the problem until it was solved. I like the Arduino platform, and because of Wiring and Processing it definitely has a place out there and have had no issues using the same UNO with XBee for example doing some neat mesh networking projects. I also have a Leonardo and a Netduino and about a dozen other micro-controller boards, but I just felt that had I used a TI or a PIC board I would have nailed this first-time with less effort. As far as a PCB goes, you're correct of course, but I already do that sort of thing and would not shy away from it. Yeah, if you can get a LH-like application, maybe optionally driving a color LCD, that would be very cool. For any of these TB apps, I agree that using a PC is overkill, but when you already have them sitting around it's not so bad. I like Adam's board, and any approach like this, because when you put together a TB and a power supply in an enclosure, you're probably going to have room to add a control panel and I think it makes for a nice self-contained solution. Russ What was the problem you found. Other then a new to you platform? I'm trying to understand why reading serial data would be hard. An advantage of the Adruino is that you don't need to make a PCB. Even if you want to do something like add a graphical display or and SD card for logging they just plug in, no solder required. Of course the pre-buillt display is even easier but can't be modified. One of my loner term goals is to move lady heather like functions onto a small uP based device. It seems wasteful to use a PC for this. ___ 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. -- Sent from my Motorola Droid Razr 4G LTE wireless tracker while I do other things. ___ 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. ___ 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] time-nuts Digest, Vol 109, Issue 57
Silabs sells the 8051 board described on my page for $10 and you can use my free source code with it, unlike and arduino or a TI board for which you have to write your own code from scratch, so if you are looking for the rock bottom price, there is no better alternative. The LCD is $10 at Mouser. But since some are willing to fork $160 for a closed source project that is already built, I thought I would offer an intermediate price point with open source software and a custom, professionally made board. 50 pieces is the smallest quantity I can have built at reasonable cost. Didier KO4BB Chris Albertson albertson.ch...@gmail.com wrote: $60 seems high. Yes I understand why you'd have to charge that much for a low volume run. but an Arduino-like device costs $30 and TI sells their MSP430 Launch Pad for $10 (shipped) and all you need to add to it is the 2x16 display and those or $6.So you could assemble something for $20. What's going on is that TI builds tens of thousands of these and sells them at cost. It is really hard to DIY a uP on a PCB for less than a LaunchPad. On Sat, Aug 17, 2013 at 8:42 AM, Didier Juges shali...@gmail.com wrote: Looking at the high price (and closed software) of what is currently offered, I have been thinking of making a kit of my GPSMonitor (see KO4BB.com) I think I could sell an assembled and tested kit with a 2x16 char display for $60 or so if I get 50 people interested. Of course, the source code is free. You can build your own using info on my web site. If anyone is interested, send me a private message. Didier KO4BB Russ Ramirez russ.rami...@gmail.com wrote: Hi Chris, The fundamental issue was that the same code that worked elsewhere could not decode the 0x8F-AB packet data 100% of the time. I saw the length of this packet vary by a few bits at the code level, so I used a logic analyzer with serial decode to examine the raw data coming in to the Arduino, but that was perfect 100% of the time, and thus the serial port breakout card was functioning OK as I expected. I am reasonably certain my code was fine, but there is always room for some uncertainty there. The project was not so important to me that I was going to spend the time to wrestle down the problem until it was solved. I like the Arduino platform, and because of Wiring and Processing it definitely has a place out there and have had no issues using the same UNO with XBee for example doing some neat mesh networking projects. I also have a Leonardo and a Netduino and about a dozen other micro-controller boards, but I just felt that had I used a TI or a PIC board I would have nailed this first-time with less effort. As far as a PCB goes, you're correct of course, but I already do that sort of thing and would not shy away from it. Yeah, if you can get a LH-like application, maybe optionally driving a color LCD, that would be very cool. For any of these TB apps, I agree that using a PC is overkill, but when you already have them sitting around it's not so bad. I like Adam's board, and any approach like this, because when you put together a TB and a power supply in an enclosure, you're probably going to have room to add a control panel and I think it makes for a nice self-contained solution. Russ What was the problem you found. Other then a new to you platform? I'm trying to understand why reading serial data would be hard. An advantage of the Adruino is that you don't need to make a PCB. Even if you want to do something like add a graphical display or and SD card for logging they just plug in, no solder required. Of course the pre-buillt display is even easier but can't be modified. One of my loner term goals is to move lady heather like functions onto a small uP based device. It seems wasteful to use a PC for this. ___ 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. -- Sent from my Motorola Droid Razr 4G LTE wireless tracker while I do other things. ___ 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. -- Sent from my Motorola Droid Razr 4G LTE wireless tracker while I do other things. ___ 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] RFTGm-II-Rb - can you gps discipline it without the XO module?
Hi Guido, That´s exactly what I did, although I used the fake approach before that , when I didn't have a UT on hand. Was that successful? If I could just output the same data stream to it once a second with the pulse from an AVR or something that would be great. Do you still have this setup? Can you tell me what bytes are sent once per second so I can recreate sending them? Thanks so much, Alan ___ 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] RFTGm-II-Rb - can you gps discipline it without the XO module?
Hi Bob, All the UT cards that I have ever seen use the small push on antenna connector. I have never seen one that directly takes anything normal like an SMA or a BNC. You buy the card and then a bit of coax with the push on on one end and (normally) an SMA on the other end. The antenna for the UT is a normal 5V powered GPS antenna. Just about anything other than a +12V survey antenna will work. Thanks, I'll look for one of these. If you go shopping, go for one of the later cards. They work a lot better than the early ones. I saw a couple on eBay, but don't know anything about them, which ones are the later ones? Thanks for your help! Alan ___ 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] RFTGm-II-Rb - can you gps discipline it without the XO module?
You can find complete copies of the Motorola Oncoremanuals here: http://wa5rrn.com Click the GPS Information link, then the Oncore link. You want Chapter 6 for the data stream descriptions, but get them all. He has other interesting GPS related manuals, as well. Bob - AE6RV From: Alan Kamrowski II ala...@earthlink.net To: 'Discussion of precise time and frequency measurement' time-nuts@febo.com Sent: Saturday, August 17, 2013 1:37 PM Subject: Re: [time-nuts] RFTGm-II-Rb - can you gps discipline it without the XO module? Hi Guido, That´s exactly what I did, although I used the fake approach before that , when I didn't have a UT on hand. Was that successful? If I could just output the same data stream to it once a second with the pulse from an AVR or something that would be great. Do you still have this setup? Can you tell me what bytes are sent once per second so I can recreate sending them? Thanks so much, Alan ___ 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] RFTGm-II-Rb - can you gps discipline it without the XO module?
Alan, yes it worked. I'll have to look through my software projects and send you the source file. Have fun, Guido Von Samsung Mobile gesendet Alan Kamrowski II ala...@earthlink.net hat geschrieben: Hi Guido, That´s exactly what I did, although I used the fake approach before that , when I didn't have a UT on hand. Was that successful? If I could just output the same data stream to it once a second with the pulse from an AVR or something that would be great. Do you still have this setup? Can you tell me what bytes are sent once per second so I can recreate sending them? Thanks so much, Alan ___ 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] Thunderbolt Monitor
This is a repost with a new thread. Sorry for the bandwidth. Looking at the high price (and closed software) of what is currently offered, I have been thinking of making a kit of my GPSMonitor (see KO4BB.com) I think I could sell an assembled and tested kit with a 2x16 char display for $60 or so if I get 50 people interested. This will use a professionally made PWB with surface mounted components. Of course, the source code is free. You do not have to buy anything from me. You can build your own using info on my web site. If anyone is interested, send me a private message. Didier KO4BB -- Sent from my Motorola Droid Razr 4G LTE wireless tracker while I do other things. ___ 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] RFTGm-II-Rb - can you gps discipline it without the XO module?
HI On Aug 17, 2013, at 2:38 PM, Alan Kamrowski II ala...@earthlink.net wrote: Hi Bob, All the UT cards that I have ever seen use the small push on antenna connector. I have never seen one that directly takes anything normal like an SMA or a BNC. You buy the card and then a bit of coax with the push on on one end and (normally) an SMA on the other end. The antenna for the UT is a normal 5V powered GPS antenna. Just about anything other than a +12V survey antenna will work. Thanks, I'll look for one of these. If you go shopping, go for one of the later cards. They work a lot better than the early ones. I saw a couple on eBay, but don't know anything about them, which ones are the later ones? You sort of have to know what you are looking at. The newer boards are based on an iLotus(?) chip set. The older boards are Motorola parts. Some of them are approaching 20 years old. The technology behind this stuff has improved over the years. Somebody else on the list may have a magic decoder ring / pictures to help figuring out the progression of parts over the years. Bob Thanks for your help! Alan ___ 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 Monitor
Hi In comparison to a 50 piece one off run, consider that most of these low end promo boards are produced at the 5 K a month level, with heavily discounted parts on them. Many of them are sold through distribution. Many (likely the bulk) of them are given away on a listen to our presentation and get a free board basis. Production volume matters, free parts do make a difference on that bill of material …. Bob On Aug 17, 2013, at 11:53 AM, Didier Juges shali...@gmail.com wrote: This is a repost with a new thread. Sorry for the bandwidth. Looking at the high price (and closed software) of what is currently offered, I have been thinking of making a kit of my GPSMonitor (see KO4BB.com) I think I could sell an assembled and tested kit with a 2x16 char display for $60 or so if I get 50 people interested. This will use a professionally made PWB with surface mounted components. Of course, the source code is free. You do not have to buy anything from me. You can build your own using info on my web site. If anyone is interested, send me a private message. Didier KO4BB -- Sent from my Motorola Droid Razr 4G LTE wireless tracker while I do other things. ___ 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] RFTGm-II-Rb - can you gps discipline it without the XO module?
Hi Guido, yes it worked. I'll have to look through my software projects and send you the source file. That would be awesome - thank you for looking! Alan -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Guido Küppers Sent: Saturday, August 17, 2013 2:49 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] RFTGm-II-Rb - can you gps discipline it without the XO module? Alan, yes it worked. I'll have to look through my software projects and send you the source file. Have fun, Guido Von Samsung Mobile gesendet Alan Kamrowski II ala...@earthlink.net hat geschrieben: Hi Guido, That´s exactly what I did, although I used the fake approach before that , when I didn't have a UT on hand. Was that successful? If I could just output the same data stream to it once a second with the pulse from an AVR or something that would be great. Do you still have this setup? Can you tell me what bytes are sent once per second so I can recreate sending them? Thanks so much, Alan ___ 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] Lady Heather without a PC
Does the iPAQ have a serial port? I have a Dell PDA that runs Pocket PC2003 with WiFi and Bluetooth but no serial port. Didier Robert Atkinson robert8...@yahoo.co.uk wrote: Hi, This is not my software. See http://fuzzythinking.com/projects/thunderhead/ I just used the complied file, but the source code is there of you want to change it. The iPAQ I built in was an H2200 series running PocketPC 2002. I've also ran it on a H3900 series (H3950) running PocketPC 2003. I used an SD card to store the exe file. A quick check on ebay shows 2200 iPAQs on buy it now for $25. Robert G8RPI. From: Chris Albertson albertson.ch...@gmail.com To: Robert Atkinson robert8...@yahoo.co.uk; Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Friday, 16 August 2013, 19:44 Subject: Re: [time-nuts] Lady Heather without a PC What OS runs on the IPAQ? Did you have to re-build LH from source? Edit: OK now I see you are running some other software called thunderhead. Same questions apply On Thu, Aug 15, 2013 at 1:17 PM, Robert Atkinson robert8...@yahoo.co.uk wrote: Hi Chris, I've posted this before, but it's worth saying again. I use the PocketPC version of Lady Heather on an IPAQ. These are available for next to nothing on Ebay and can run in a dock on the bench or you can gut it and embed it in a cased Thunderbolt. worn out batteries are not an issue as we have constant power available. They just need 5V. One with an SD card slot is good so you don't have to re-load the code from a PC if the power does go out. Robert G8RPI. From: Chris Albertson albertson.ch...@gmail.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Wednesday, 14 August 2013, 18:36 Subject: Re: [time-nuts] ThunderBolt Display What was the problem you found. Other then a new to you platform? I'm trying to understand why reading serial data would be hard. An advantage of the Adruino is that you don't need to make a PCB. Even if you want to do something like add a graphical display or and SD card for logging they just plug in, no solder required. Of course the pre-buillt display is even easier but can't be modified. One of my loner term goals is to move lady heather like functions onto a small uP based device. It seems wasteful to use a PC for this. On Wed, Aug 14, 2013 at 10:16 AM, Russ Ramirez russ.rami...@gmail.comwrote: Yeah, after trying to (reliably) get the time out of the pertinent TSIP message using an Arduino UNO, I can understand your statement Adam about the Arduino approach. It kinda works, but it felt like I was fighting the implementation of the controller card and that I should cut-over to my own solution using an Atmel, PIC or TI chip that I could just load C code into. One of this lists members gave me the code I needed, so ironically using the UNO made the project more difficult. Russ K0WFS ___ 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. ___ 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. -- Sent from my Nexus 7 tablet. ___ 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] Lady Heather without a PC
I do have a desktop IPAQ. It runs Windows Embedded on ARM (at least, this one does) Didfier Bob Camp li...@rtty.us wrote: Hi There are two products called IPAQ. One was a desktop computer, the other was a PDA. The desktop will run anything, the PDA can handle some of the BSD's and Linux's. Both need to be configured / compiled to match the device. Bob On Aug 16, 2013, at 2:44 PM, Chris Albertson albertson.ch...@gmail.com wrote: What OS runs on the IPAQ? Did you have to re-build LH from source? Edit: OK now I see you are running some other software called thunderhead. Same questions apply On Thu, Aug 15, 2013 at 1:17 PM, Robert Atkinson robert8...@yahoo.co.ukwrote: Hi Chris, I've posted this before, but it's worth saying again. I use the PocketPC version of Lady Heather on an IPAQ. These are available for next to nothing on Ebay and can run in a dock on the bench or you can gut it and embed it in a cased Thunderbolt. worn out batteries are not an issue as we have constant power available. They just need 5V. One with an SD card slot is good so you don't have to re-load the code from a PC if the power does go out. Robert G8RPI. From: Chris Albertson albertson.ch...@gmail.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Wednesday, 14 August 2013, 18:36 Subject: Re: [time-nuts] ThunderBolt Display What was the problem you found. Other then a new to you platform? I'm trying to understand why reading serial data would be hard. An advantage of the Adruino is that you don't need to make a PCB. Even if you want to do something like add a graphical display or and SD card for logging they just plug in, no solder required. Of course the pre-buillt display is even easier but can't be modified. One of my loner term goals is to move lady heather like functions onto a small uP based device. It seems wasteful to use a PC for this. On Wed, Aug 14, 2013 at 10:16 AM, Russ Ramirez russ.rami...@gmail.com wrote: Yeah, after trying to (reliably) get the time out of the pertinent TSIP message using an Arduino UNO, I can understand your statement Adam about the Arduino approach. It kinda works, but it felt like I was fighting the implementation of the controller card and that I should cut-over to my own solution using an Atmel, PIC or TI chip that I could just load C code into. One of this lists members gave me the code I needed, so ironically using the UNO made the project more difficult. Russ K0WFS ___ 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. ___ 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. ___ 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. -- Sent from my Nexus 7 tablet. ___ 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] RFTGm-II-Rb - can you gps discipline it without the XO module?
Hi Guido,
yes it worked. I'll have to look through my software projects and send you the
source file.
Please do, so far my attempt is just failing.
I'm trying to send:
//transmit gps data
txserial_putc('@');
txserial_putc('@');
checksum=0;
checksum_putc('E');
checksum_putc('a');
checksum_putc(1); //month
checksum_putc(1); //day
checksum_putc(208); //year2 2000
checksum_putc(7);
checksum_putc(0); //h
checksum_putc(0); //m
checksum_putc(0); //s
checksum_putc(0); //frac40
checksum_putc(0);
checksum_putc(0);
checksum_putc(0);
checksum_putc(0); //lat4 0
checksum_putc(0);
checksum_putc(0);
checksum_putc(0);
checksum_putc(0); //long40
checksum_putc(0);
checksum_putc(0);
checksum_putc(0);
checksum_putc(0); //elip40
checksum_putc(0);
checksum_putc(0);
checksum_putc(0);
checksum_putc(0); //notused4 0
checksum_putc(0);
checksum_putc(0);
checksum_putc(0);
checksum_putc(0); //vel20
checksum_putc(0);
checksum_putc(0); //heading20
checksum_putc(0);
checksum_putc(0); //dop20
checksum_putc(0);
checksum_putc(0); //doptype 0
checksum_putc(12); //vissats 12
checksum_putc(8); //trackedsats 8
checksum_putc(0); //satid 0
checksum_putc(6); //trackmode sat time available
checksum_putc(0); //carrnoise
checksum_putc(2); //status using for time solution
checksum_putc(1); //2
checksum_putc(6);
checksum_putc(0);
checksum_putc(2);
checksum_putc(2); //3
checksum_putc(6);
checksum_putc(0);
checksum_putc(2);
checksum_putc(3); //4
checksum_putc(6);
checksum_putc(0);
checksum_putc(2);
checksum_putc(4); //5
checksum_putc(6);
checksum_putc(0);
checksum_putc(2);
checksum_putc(5); //6
checksum_putc(6);
checksum_putc(0);
checksum_putc(2);
checksum_putc(6); //7
checksum_putc(6);
checksum_putc(0);
checksum_putc(2);
checksum_putc(7); //8
checksum_putc(6);
checksum_putc(0);
checksum_putc(2);
checksum_putc(32); //receiverstat 3d fix
txserial_putc(checksum);
txserial_putc(13);
txserial_putc(10);
Thanks,
Alan
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Re: [time-nuts] Star Box
Magnus, Thanks for the comments. I did find the manual online. I will have to read through it when I get a chance. From the past comments in the archives, I was hoping to hear about anyone's experience using this in a GPSDO and whether it would be better than other brands. I have set it aside for now, as I have other projects that need to be finished before the end of the month. Early next month I'll be away for some training. I'd take some of my projects with me to work on in the evening, after training, but I'm afraid I'd get arrested by the TSA when they see electronic stuff :-) Joe Gray W5JG On Sat, Aug 17, 2013 at 5:00 AM, Magnus Danielson mag...@rubidium.dyndns.org wrote: Hi Joe, On 08/16/2013 04:47 AM, Joseph Gray wrote: I just picked up a Star Box for $10. It has an Allstar DGPS board inside. I saw several mentions of similar boards in the archives and I have found some documentation on the net. Has anyone actually used one of these in a GPSDO? Does it work any better than the usual Motorola, Rockwell, or other available boards? The other thought is, since this is a DGPS board, how difficult would it be to use it to obtain a more accurate position fix? Or do I need other GPS boards to correlate this one with? I'll admit that so far, I have only skimmed the documentation that I downloaded. If I need to RTFM for my answers, just tell me so. Some data on what I have: Star Box Part No. 100-600304-100 (DGPS Base Station option is checked) Inside the box is a carrier board that has a power supply and an RS-232 TX/RX chip. The GPS board that plugs onto the carrier has a label on the underside that says VAR 100. This corresponds to the suffix of the part number on the box. The top side of the GPS board has the GPS receiver in a large metal box that is imbossed ALLSTAR 12 and CMC, which is the manufacturer (since then bought by Novatel?). Grab the manual, set it on self-survey and you have a nice little receiver. Since it does both code and carrier phase, you have added precision. Since it is a DGPS base station, it naturally have a built-in self-surveying using the power of that combined tracking. Hook it up to a good choke-ring, it deserves it. Multipath is what kills precision for this one. It will output DGPS corrections, such that any other DGPS receiving GPS you have can quickly acquire accurate lock, but you need to provide a link for the RTCM messages. Love to have one even if I have similar stuff. Cheers, Magnus ___ 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.
