[time-nuts] talking to Synergy Systems SSR-6Tr (u-blox LEA-6T-0)
I was happy to find the one-off $35 deal for the SSR-6Tr from Synergy Systems is still on, and I got mine yesterday. It works OK using Motorola WinOncore12 to talk with it, in Motorola Binary format, and the performance does seem better than the Oncore M12+ I was previously using (eg. smaller average sigma on Lat/Lon/Height values from the same fixed antenna). The one datasheet I could find (nothing on the mfr's website!?) says this part can talk in three different formats including UBX Binary: P/N 16062133G SSR-6Tr ROM based, w/PIC, Mot Bin, UBX Bin, NMEA, No Battery I think several people on the list have this device, I'm curious how you interface with it. What commands switch to NMEA or UBX Binary? I tried to use ublox U-Center v8.1 without success (although that program works fine in generic NMEA mode on a different model GPS). Thanks for any advice! -John Beale n8juf ___ 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] troubleshooting a FE-5680A (got two; only one works)
Just yesterday I received two FE-5680A units from China. One of them works and one doesn't achieve lock. Both are labelled with FEI P/N 217400-30352-1. Here's a photo of the one that works, the other looks just the same but different serial number. https://picasaweb.google.com/109928236040342205185/FE5680A#5680473663653140162 FE-5680A Rb #1: At startup, RF out (pin 7) ramps from 9.999828 to 10.66 MHz for a few minutes, then locks at 10.00 MHz and pin 3 drops low. The RF signal is about 2 Vpp. Power draw at startup about 25 W, dropping to 10 W. FE-5680A Rb #2: RF out scans from 9.999799 to 9.94 MHz repeatedly, and does not achieve lock. Pin 3 remains high. The RF signal is about 1 Vpp (half the level of the working unit). Power draw similar to unit #1. Any suggestions for what might be done to prod the 2nd unit towards working? I see some things which might be trimmer caps on the board, and what might be a round heating element(?) soldered to a crystal can in this photo: https://picasaweb.google.com/lh/photo/0WRM10pGG0Kd89Ji80yoa9MTjNZETYmyPJy0liipFm0?feat=directlink thanks for any advice! John Beale N8JUF ___ 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] FE-5680A temp coefficient seems to be -7E-12 per degree C
My measurements on one FE-5680A Rb sample indicate a temperature coefficient of -7E-12 per degree C (T measured at exterior case top center); more details below. Can anyone opine if this is a reasonable value? I can't say anything about long-term drift until I stabilize the case temperature. Currently experimenting with a variable-speed fan and PID controller looking at a thermistor attached to the case, to that end. The starting point of -3.2E-10 offset is just how the unit arrived, I have not yet tried changing the frequency via RS-232 commands. With a 40mm 12V fan running at 5V and pointed at a 4x6x1 finned heatsink the unit is mounted on, the case temp. drops 10 degrees (55C - 45C), and the unit 15Vdc power draw increases 2 watts. (Perhaps a bit less, I actually measured the power at 120Vac with a WattsUp Pro meter, but I assume my DVE 15V 2A switcher is pretty efficient. Supply is from lightobject.com and actually provides 14.84 V, but that seems to work.) Ambient room temp was also logged; it varies by about 2 C as building heater cycles. FE-5680A 10 MHz F_offset vs. GPS using picPET: http://www.leapsecond.com/pic/picpet.htm and Sure Electronics GPS: http://www.leapsecond.com/pages/MG1613S/ -- Foff = -3.20E-10 7:30 am Dec.14 2011 (32 hours). Case top: ~45 C Foff = -3.22E-10 9 pm Dec. 15 2011 (14.5 hours). Case top: 41.5-44.5 C Foff = -3.227E-10 3 pm Dec. 17 (40.9 hours). Case top: 42-44 C Foff = -3.216E-10 11 pm Dec. 19 (46.5 hours). Case top: 42-44 C Foff = -3.902E-10 10 am Dec 20 (11 hours). Case top: 52.5-53.5 C (fan off) Foff = -3.910E-10 10 am Dec. 21 (12 hours of data). Case top: 52.5-53.5 C conclusion: tempco is -7E-11 with +10 C, or about -7E-12 per degree C -- see also: https://picasaweb.google.com/109928236040342205185/FE5680A -- ___ 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] FE-5680A clock shaping (sine - square wave)
In case it's useful... there are many ways to get a square wave out from a sine wave in, but one straightforward way is with a comparator. Some work better than others. The slow ones won't work at all at 10 MHz, and the very fast comparators (MAX999, ADCMP600, LT1116 etc.) are more expensive, and perhaps harder to work with. I tried a MAX9013 in SO-8 package and it works well for the job. You can see my schematic, circuit and scope plots at the bottom of this page: https://picasaweb.google.com/bealevideo/FE5680A My circuit works best with a sine wave input amplitude above 100 mVpp. Below that level, the duty cycle starts to become noticeably worse. I am using some hysteresis, but it may not be necessary. Previous to those pics on the page, you also see a circuit which did not work so well, using a MAR-1 (broadband DC-1GHz MMIC amp). It's intended as a linear amp, and it does not saturate in a symmetric way even with large input signals. Here are a few other circuits of interest, which I did not try: http://www.ko4bb.com/~bruce/CLKSHPR.html http://www.ko4bb.com/Timing/ClockShaper.php ...and by the way, my FE-5680A shows a consistent -7E-12 per degree C temperature sensitivity (measured at case temp 42 and 52 C). Has anyone else measured theirs? -john beale ___ 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] FE-5680A clock shaping (sine - square wave)
On Thu, 29 Dec 2011 21:14:30 -0800, John Beale be...@bealecorner.com wrote: In case it's useful... there are many ways to get a square wave out from a sine wave in, but one straightforward way is with a comparator. [...] FWIW, I decided on a more straightforward way to get a square wave output from my FE-5680A: bypass the internal sine-wave filter, and take the original 10 MHz output direct from the XC9572 CPLD ! (now, I vaguely recall, this may have already been described on the list...) Here's a photo of the modification I did: unsolder and rotate the 15 ohm resistor on CPLD pin 49, so it now feeds a short ribbon cable, which runs through the hole in the case intended for the (non-working) trim pot: https://picasaweb.google.com/lh/photo/YkQseTWUZolGYd5VSwE9odMTjNZETYmyPJy0liipFm0?feat=directlink What the square wave looks like coming out through the cable, on a TDS-210 with 10x probe, no termination load: https://picasaweb.google.com/lh/photo/lcFB0P5rEEd10K508nWCv9MTjNZETYmyPJy0liipFm0?feat=directlink I see a 10 MHz 3.3V square wave with ~5 ns risetime and about 0.3 Vpp of ringing, probably as good as I could expect with this scope and wiring arrangement. I suspect this way I will get better jitter performance than I could expect trying to square up the standard sine wave output by whatever means. ___ 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] FE 5680a 3pay 36.89 includes shipping. Finally ordered one
On 1/3/2012 8:20 AM, Robert Benward wrote: I got mine for around $25 in a regular bidding affair. Mine had trouble locking, It only locked a handful of times, and that took forever, but most of the time it just sat there and cooked. The seller replaced it and the new locks up in 2 or 3 minutes. I did not have to ship the old one back. The Lock output signal doesn't seem to have enough drive to turn on an LED. One of the three FE-5680A units I got behaved exactly that way. Turns out some part of a VCXO circuit had drifted over time (I assume) so the free-running frequency never quite reached up to 10.000 MHz enabling lock to the signal from the physics package. Assuming you do have a 10 MHz output signal, put a counter on it while it is warming up and look at the frequency. After I fixed it, the frequency vs time from startup plot looked like this: https://picasaweb.google.com/lh/photo/7E22rkh_YivyesrnTog6atMTjNZETYmyPJy0liipFm0?feat=directlink The fix was to take off case top and bottom and tweak the trimmer cap marked C217 slightly, it is near Y200 (crystal with round PTC thermistor attached). Here's a photo of that part of the board: https://picasaweb.google.com/109928236040342205185/FE5680A?authkey=djqVhWs9LkM#5680683008490223330 Of course there may be some completely different problem with your unit, but it's something to try, if you want to open it up and play with it. -John Beale ___ 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] crunching numbers from XOR phase detector
Previously I have been comparing 10 MHz frequencies using TvB's picPET device plus a picDIV divider to get a 1 PPS signal, but I wanted more resolution for comparing relative drift of two Rb references. I got square wave outputs from my references (see my previous posts) and I made a simple XOR phase detector from a single XOR gate (74LVC1G86) : https://picasaweb.google.com/lh/photo/ofFwP8Eo1qFAzNObq69iCtMTjNZETYmyPJy0liipFm0 I have read about how nonlinear the XOR PD becomes at the endpoints (0 and 180 phase shift) although this one seems to work pretty well, and the output looks reasonably triangular: https://picasaweb.google.com/lh/photo/swKVhhP7NerRvMKdnW8rjtMTjNZETYmyPJy0liipFm0 There is some nonlinearity but it seems consistent from cycle to cycle. I might be able to reduce the bumps with better circuit layout, shorter wires, terminated lines etc. But just for playing around with my initial data, I think I can model the shape of the response and get a more accurate reading of instantaneous phase angle vs time. I could write some code for this, but I suspect this wheel has been invented before... is there any reference I should consult? I think something similar is done inside the PIC-TIC to calibrate its response? ___ 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] Progress on the FE-5680A serial commands!
On 1/19/2012 9:52 PM, Scott Newell wrote: http://n5tnl.com/time/fe-5680a/graphs/fe5680_2_ch3.png http://n5tnl.com/time/fe-5680a/graphs/fe5680_2_ch4.png This assumes that the reply from the undoc command 0x5a is the raw counts from the 4 channel 12 bit ADC. I think channel 3 is a temp sensor. What would channel 4 be? Photodiode output? Great detective work Scott! I'll bet Channel 4 is voltage to the VCXO. It is driven up and down at startup searching for the lock, then it settles down, but the oscillator components are also affected by temperature so the VCO voltage would logically track the temperature too. At least it seems a reasonable theory. For example, look at this plot of the 10 MHz output frequency after powerup. It has a similar look to your Channel 4, except for the post-lock drift. https://plus.google.com/photos/109928236040342205185/albums/5680473650837554113/5681715799377076466?banner=pwa -John Beale ___ 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] FE-5680A command decoding speculation
Speculation... just for fun. Seeing Javier's great recent work on the 5680 DDS operation has me thinking more about two of the mystery commands. If the unit is applying a periodic correction to the DDS frequency beyond what the user requests via RS-232 commands, as a function of (for example) temperature, and/or a power supply voltage, it would need some calibration coefficient. Those correction factors would logically be a user-settable parameter. We know there is a 12-bit 4 channel A/D chip onboard, apparently monitoring temperature (and supply voltage?) and maybe that's not just a passive monitor function, but used to generate the correction factor. Now, looking at the response to Cmd 0x57 and 0x59 on my unit, I see a long string of bytes which look like sets of 2-byte pairs, the second byte of each pair differs by roughly the same number from the previous. Each unit has a different number of these pairs, and they are followed by all 0x00 bytes. Pure speculation here, but if the unit was keeping a log of the most recent commanded voltage or temperature coefficient correction factors, and this was done at regular intervals, it might look a lot like that. Another possibility is an automatically generated correction, if there is any known drift with time (?). Yet another possibility is a look-up table, for example, to take the measured temperature to find the right DDS offset correction factor. I might expect the lookup table to be a consistent size, though. In case of interest, below is the data I'm talking about, from my three units. Remember the first 4 reply bytes is a command header, and the last byte is a checksum. FE-5680A Unit Number 62388: -- Cmd 0x57 0x56 byte reply: 57 56 00 01 30 40 00 4B 00 58 00 63 00 6E 00 7A 00 85 00 90 00 97 00 9C 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0A Cmd 0x59 0x56 byte reply: 59 56 00 0F 30 BF 00 A2 00 80 00 2F 00 00 00 EA FF 9E FF 7C FF 4A FF 39 FF 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 06 FE-5680A Unit Number 66721: -- Cmd 0x57 0x56 byte reply: 57 56 00 01 50 41 00 43 00 47 00 4A 00 4E 00 51 00 55 00 58 00 5C 00 5F 00 63 00 66 00 6A 00 6E 00 71 00 75 00 78 00 7B 00 7F 00 82 00 85 00 89 00 8C 00 90 00 93 00 97 00 9A 00 9E 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 A5 Cmd 0x59 0x56 byte reply: 59 56 00 0F 50 CB FF BC FF C6 FF B0 FF B5 FF A9 FF 8E FF 77 FF 9B FF B0 FF 8C FF CD FF E5 FF 00 00 81 FF B0 FF C1 FF D6 FF DD FF D2 FF D9 FF B7 FF D8 FF CB FF E4 FF DB FF F9 FF E1 FF 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 B7 FE-5680A Unit Number 72476: -- Cmd 0x57 0x56 byte reply: 57 56 00 01 68 3F 00 42 00 46 00 4A 00 4D 00 51 00 55 00 58 00 5C 00 5F 00 63 00 66 00 6A 00 6D 00 71 00 74 00 78 00 7B 00 7F 00 82 00 86 00 89 00 8D 00 90 00 94 00 97 00 9B 00 9E 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 E6 Cmd 0x59 0x56 byte reply: 59 56 00 0F 68 FF FF 01 00 E3 FF CE FF D8 FF EA FF D2 FF F0 FF FE FF 16 00 0A 00 0D 00 F6 FF 00 00 EF FF FE FF DD FF D3 FF E2 FF F5 FF F2 FF F3 FF E5 FF EE FF B3 FF C4 FF DA FF A9 FF 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4B --- John Beale n8juf ___ 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] FE-5680A decoded - another piece of the puzzle
On 1/29/2012 8:22 PM, Skip Withrow wrote: I recall someone implementing C-field control on a FE-5680A with the pot disabled, but cannot find it now. If someone can point me to that post I sure would appreciate it. I added that post to the FE-5680A FAQ, and added my own photo also to help locate the part. Note, I have not actually tried this modification myself. http://www.ko4bb.com/dokuwiki/doku.php?id=precision_timing:fe5680a_faq#adding_an_analog_adjustment_pot Original post was by Bill Riches, Thu, 22 Dec 2011 14:01:18 -0800 ___ 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] FE-5680A programming connector pinout
http://www.rhodiatoce.com/pics/time-nuts/FE-5680A_annotated.jpg Excellent work! I look forward to any further info. Great picture with the pins and some parts labelled. By the way, if you want you could add the frequencies going into and out of the Xilinx XC9572XL CPLD part: Pin 64: 60 MHz in from VCXO Pin 1: 20 MHz out to AD9832 DDS chip Pin 22: 30 MHz out Pin 49: 10 MHz out to sine shaping network See also: https://plus.google.com/photos/109928236040342205185/albums/5680473650837554113/5685304134718133138 It might clarify things to point out the 60 MHz through-hole crystal pins visible immediately below the MMBV432 varactor diode. Knowing that's the varactor, and looking at the circuit I'm guessing the VCXO tuning voltage must pass through the 10K resistor next to mini-coax connector J8 (then past the bypass cap, through the 1.0 uH inductor, to the diode). That 10k connects through a 1k to pin 8 (output 3) of the TLC27M4B quad opamp on the other side of the board, near the 60 MHz xtal. Hmm sure enough: at startup, pin 8 swings between 0 and 11.9V, before the unit locks, which in my case happens at 7.3 Volts. (The opamp is powered from a 13.16V supply, output swings typ. 1.3V below the + rail.) Just for fun, here's a plot of the VCXO tuning voltage at startup: https://picasaweb.google.com/109928236040342205185/FE5680A#5704421825887557874 ___ 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] FE5680 missing PPS - hallelujah!
Thank you Bob! I just tried removing the lock indicator LED on my three 5680A units and sure enough, in every case, there was the 1 PPS (+5V, 1 usec, rise/fall time ~100 ns) just as if it had always been there. As a reminder, this and much else useful lore is now collected at the ongoing FE-5680 FAQ at http://www.ko4bb.com/dokuwiki/doku.php?id=precision_timing:fe5680a_faq (and if the answer to any of your nagging FE-5680A questions is missing from the FAQ, please feel free to add it!) -John On 2/2/2012 12:46 PM, bob grant wrote: Some info... Its tempting to attach an LED to the /LOCK signal on the DB9. However this signal is very weak and the LED does not seem very bright and PPS signal does not pulse...Hmm Internally the /LOCK pin is connected the 74AC240 buffer, but with an LED helping to keep the signal voltage high (2.3V) a logic low is never asserted. This logic low is needed to enable one half of the 74AC240 buffer (pin 1) that gates the PPS signal. Don't directly drive LEDs from the LOCK signal on the DB9 and, voila, the PPS signal reappears. Bob ___ 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] Freq cal to 1ppm without GPSDO
Hi Murray, Thanks to you and the others for your replies. After some more HF reception problems here, I have come to the same conclusion as you. I found an Oncore M12+ timing GPS is available pretty cheap from Hong Kong, so that's my plan. best regards, John Beale 1. My best advice is to get hold of a cheap GPS module with a 1pps (seconds pulse) output. Connect it up, and when you have a fix, use the 1pps to trigger your digital oscilloscope. Set the timebase to 1us/div to start with, and ultimately 100ns, and observe the 10MHz output of your TCXO. You will see the waveform drifting slowly. Counting how long it takes to slip one cycle will tell you how far off the TCXO is. If you have a counter with Time Interval mode capability, you could use that, using the GPS to start and 10MHz to stop, again observing the drift. ___ 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] yet another version of PIC 1pps code, for 16F1823
I got some of the cheap Pletronics OHM40480526 26MHz OCXO parts for experiments (couldn't resist $2 each :-). For this purpose I modified the Richard H McCorkle/Tom Van Baak code for generating a 1 pps output from a PIC, to work with 26 MHz input, and also target the PIC 16F1823 since that's the part I had handy. But, being new to the PIC16F family it took some time to get all the configuration bits correct. So in case anyone else is in that position, here's the code I ended up with: http://bealecorner.org/best/measure/time/source/PIC16F1823-26MHz-1pps_asm.txt My M12T+ GPS board is coming on a slow boat from China, so I don't yet have any real standard to compare this with. But I set up two OCXOs driving two PICs, and compared the two 1pps outputs on a 2-ch scope, after tweaking my 10k 10-turn trim pot feeding the ADJ pin on one part to be pretty close in frequency to the other. I see a slow steady increase in phase lag, accumulating 167 ns in 7 minutes, so I have a frequency difference between my two oscillators of 1.67E-7/420 = 4E-10 or 0.4 ppm. For better measurements I guess I want a PIC-TIC or equivalent. -John Beale ___ 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] help with initial setup for Motorola M12+T GPS? is my board dead?
I just received my first real piece of time hardware, a M12+T timing GPS. At least, that's what it's supposed to be, it doesn't actually have any label saying so. I got it online from this seller: http://www.ioffer.com/i/Motorola-ONCORE-M12+T-timing-gps-receiver-1pps-100hz-105387652 The board I received looks like this: https://picasaweb.google.com/bealevideo/GPS#5580118907079326290 I got the 2x5 0.05 connector, built a 3.0V power supply, and hooked up the serial lines to a FTDI USB-to-serial (3.3V logic level) board, and am trying to talk Motorola Binary at 9600 baud to it using WinOncore12. I tried the setup receiver wizard, the GPS self-test, and uploading an almanac. My scope shows the serial data from the PC going into the board, but no signals ever come out. The TX line out of the board just sits quietly at +3V. Is there anything obvious I should be trying? Thanks for any help! ___ 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] help with initial setup for Motorola M12+T GPS? is my board dead?
On 3/4/2011 11:54 PM, John Beale wrote: The TX line out of the board just sits quietly at +3V. Is there anything obvious I should be trying? Er.. nevermind. It seems that swapping TX and RX helped. Sigh. --- COPYRIGHT 1991-2000 MOTOROLA INC. SFTW P/N # 61-G10002A SOFTWARE VER # 1 SOFTWARE REV # 3 SOFTWARE DATE Mar 13 2000 MODEL #P183T12N12 HWDR P/N # 1 SERIAL # P0171Z MANUFACTUR DATE 1J12 ___ 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] difference between Oncore M12 and M12+T (useful when buying online)
In case anyone else is shopping online for a used Motorola Oncore M12+T timing GPS, it's probably useful to know what I just learned: Some online sellers offering M12+T 100 pps GPS may instead send you a M12 Navigation (non-timing) GPS. The differences: Motorola Oncore M12 Navigation GPS: --- * Supports Motorola Binary and NMEA output * does not have 100 Hz output * does not have TRAIM (Timing Receiver Autonomous Integrity Monitor) * does not have sawtooth correction output * 1 PPS 500 ns timing crystal nearest MMCX antenna connector is two-lead can style with bent leads for surface mounting example p/n label: P183T12N12 (final N = Navigation?) photos: http://www.wa5rrn.com/GPS%20Other/Motorola%20M12/m12.pdf https://picasaweb.google.com/bealevideo/GPS#5580118907079326290 Motorola Oncore M12+T Timing GPS: --- * Supports Motorola Binary output only * 1 Hz or 100 Hz output selectable * TRAIM (Timing Receiver Autonomous Integrity Monitor) * sawtooth correction (clock granularity) message available * 1 pps 2nS 1 Sigma, 6nS 6 Sigma (using sawtooth correction message) * 1 pps 10nS 1 Sigma, 20nS 6 Sigma (without correction) smaller leadless surface-mount crystals example p/n label: P283T12T17(final T = Timing?) photos: http://www.wa5rrn.com/GPS%20Other/Motorola%20M12/m12plusbrochure.pdf http://cgi.ebay.co.uk/ws/eBayISAPI.dll?VISuperSizeitem=290308535362 ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] how to set up a Jupiter-T?
In case anyone's interested, I've discovered a few things about my Jupiter-T: 1) WinOncore12 sends commands too quickly. The TU60 needs quite some time to process each one. If I type the commands in by hand separately, more of them work as expected. 2) Typing the command @@Ae will set longitude, but reports longitude 0 and 8000 reports 37 degrees East, and is about 74 degrees East and that's the largest allowed value. So either on sending or receiving, or both, I think WinOncore12 is interpreting the data fields differently than the TU60. Or you can't use this device in the west :-) 3) Don't try to use *bay GPS Antenna Item: 260664041419 including 10-meter lead to MCX connector, it doesn't work. Not even on a different, known-good receiver. Might have too high a gain (55 dB??) Or I just got a bad one. -John On 4/9/2011 8:00 AM, John Beale wrote: Navman TU60 Jupiter-T COPYRIGHT 1995-2004 NAVMAN LTD. SFTW P/N # SOFTWARE VER # 93 SOFTWARE REV # 07 SOFTWARE DATE 01/16/2004 MODEL # R01 HDWR P/N # TU60-D125 SERIAL # 703127719 MANUFACTUR DATE 701//52030 OPTIONS LIST 5843 ___ 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.
