Re: [time-nuts] Lucent KS-24361 10 Mhz out success.
Alex wrote: The OCXO in the TBolt beats the Morion parts by a wide margin. Bob in what way dies it? phase noise ? harmonics? standalone frequency stability? Yes, all of those (specifically referring to the Trimble p/n 37265 OCXO used in the later Tbolts that we usually see as surplus). Note that some earlier (and perhaps, later) Tbolts used different Trimble oscillators that are not as good as the 37265 with respect to phase noise, and many earlier Tbolts used a rather undistinguished Piezo (brand) OCXO. Best regards, Charles ___ 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] Lucent KS-24361 10 Mhz out success.
Hi On Dec 3, 2014, at 9:34 PM, Alex Pummer a...@pcscons.com wrote: The OCXO in the TBolt beats the Morion parts by a wide margin. In the context of the message that was a reply to; Phase noise Bob Bob in what way dies it? phase noise ? harmonics? standalone frequency stability? 73 Alex ___ 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] Lucent KS-24361 10 Mhz out success.
Hi Of course the point I made is not as useful as it might be.There are a ton of Morions out there and very few Trimble OCXO’s outside of TBolts. I doubt anybody is going to scrap out a working TBolt for it’s OCXO :). Once you get them surplus, there is no reason to believe the Trimble parts survive the scrap out process any better than the Morions. Also since the TBolt they came out of is worth *far* more than the OCXO, it’s not at all clear why you would pull one from a working unit. If they unit was broke - was it the OCXO ?? H….. Bob On Dec 4, 2014, at 4:10 AM, Charles Steinmetz csteinm...@yandex.com wrote: Alex wrote: The OCXO in the TBolt beats the Morion parts by a wide margin. Bob in what way dies it? phase noise ? harmonics? standalone frequency stability? Yes, all of those (specifically referring to the Trimble p/n 37265 OCXO used in the later Tbolts that we usually see as surplus). Note that some earlier (and perhaps, later) Tbolts used different Trimble oscillators that are not as good as the 37265 with respect to phase noise, and many earlier Tbolts used a rather undistinguished Piezo (brand) OCXO. Best regards, Charles ___ 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] Convert Stanford Research SR620 time-interval counter to SR625 ???
I certainly won't cry foul. There's places where rolling your own can put key assets at risk - it I had 4 I would push the issue but I only have one atomic reference and I'd rather not blow it up If anyone has things they need blown up I am available for the cost of beer. As electronics get more advanced and smaller they certainly have become MUCH more delicate. On Wednesday, December 3, 2014, Paul tic-...@bodosom.net wrote: On Wed, Dec 3, 2014 at 3:54 PM, David I. Emery d...@dieconsulting.com javascript:; wrote: Do you have any rough number as to what they charged you for this ? The price at the SRS store is $150. A great deal compared to $100 for a manual or heatsink. Granted the board is a bit more complex than a DE-9 and a couple of BNC connectors. I just looked at the retail for a PRS-10 and got over it. ___ time-nuts mailing list -- time-nuts@febo.com javascript:; 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] Lucent KS-24361 10 Mhz out success.
Any more details on this ? Ulrich In a message dated 12/4/2014 7:36:22 A.M. Eastern Standard Time, kb...@n1k.org writes: Hi On Dec 3, 2014, at 9:34 PM, Alex Pummer a...@pcscons.com wrote: The OCXO in the TBolt beats the Morion parts by a wide margin. In the context of the message that was a reply to; Phase noise Bob Bob in what way dies it? phase noise ? harmonics? standalone frequency stability? 73 Alex ___ 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] Lucent KS-24361 10 Mhz out success.
Ulrich, I think my threads been taken over again. I keep writing about modifications to the KS-24361 and the thread takes off in wild directions about other things like Morion oscillators and TBolts. I believe your question is to Bob perhaps on 1/f noise? Regards Paul WB8TSL On Thu, Dec 4, 2014 at 7:42 AM, Ulrich Rhode via time-nuts time-nuts@febo.com wrote: Any more details on this ? Ulrich In a message dated 12/4/2014 7:36:22 A.M. Eastern Standard Time, kb...@n1k.org writes: Hi On Dec 3, 2014, at 9:34 PM, Alex Pummer a...@pcscons.com wrote: The OCXO in the TBolt beats the Morion parts by a wide margin. In the context of the message that was a reply to; Phase noise Bob Bob in what way dies it? phase noise ? harmonics? standalone frequency stability? 73 Alex ___ 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] LTE-Lite
With the LTE-Lite, are the survey results held in non-volatile memory, or does it need to do a survey each time it is switched on? This is a fixed location. The survey light is still on after a number of hours of operation (but it may have gone off in the meanwhile), and the GPS light sometimes flashes and sometimes not. The signals I'm seeing at the moment are: 24 30 26 18 32 27 21 18 and 19 in the signal quality indicator of Visual GPS. This with the puck on the top storey of a two storey building, but indoors. Other GPS pucks work fine in the same location. The PPS output appears to be correct, and there is 20 MHz from the 20 MHz port, but nothing from the Clock Out port on this 10 MHz unit. The unit is as-received, with the exception of switching to NMEA sentences. Thanks, David -- SatSignal Software - Quality software written to your requirements Web: http://www.satsignal.eu Email: david-tay...@blueyonder.co.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.
Re: [time-nuts] 10 MHz oscillators vs 100 MHZ
Ulrich was honored at the 2014 IEEE International Frequency Control Symposium May 19-22 in Taiwan: http://www.arrl.org/arrlletter?issue=2014-05-29 the award recognizes ...leadership in the frequency control community... the main award was for the development of PC software now allowing nonlinear noise analysis of RF circuit . Take also a look to this paper, from spark generators to modern VCOs: http://www.neazoi.com/technology/linearuhf/Rohde.pdf. Honor to you, Ulrich. On Wed, Dec 3, 2014 at 10:43 PM, Ulrich Rhode via time-nuts time-nuts@febo.com wrote: Thanks for the flowers , Ulrich In a message dated 12/3/2014 4:38:04 P.M. Eastern Standard Time, paulsw...@gmail.com writes: What a pleasant surprise to see Ulrich post on Time-nuts. We spoke many years ago on radio on as I recall an opening on 2 meters FM. I have to agree with Azelio for many of us it is the other way around. We would learn as we do from many of the other excellent Time-nuts mentors. Best regards Ulrich Paul WB8TSL On Wed, Dec 3, 2014 at 12:04 PM, Neil Schroeder gign...@gmail.com wrote: Wenz will happily well you anything in stock. I just picked up my first original owner OCXO - a 100mhz onyx. On Wednesday, December 3, 2014, Azelio Boriani azelio.bori...@gmail.com wrote: I think that Ulrich should teach us how to make such an oscillator, not the other way round... http://www.tu-cottbus.de/fakultaet3/de/fakultaet/institute/stiftung/prof-dr-ing-habil-dr-hc-mult-ulrich-l-rohde.html On Wed, Dec 3, 2014 at 8:11 AM, Gerhard Hoffmann dk...@arcor.de javascript:; wrote: Am 03.12.2014 um 00:28 schrieb John Miles: NEL has great OCXOs. Also worth checking out Wenzel (they own Croven Crystals and will sell them separately), Rakon, and Vectron. I haven't seen any 100 MHz OCXOs rated for -145 at 100 Hz, but -135 can be had. We had a few from Pascall that where at -145 @100@100M http://www.pascall.co.uk/content/S635399087054759815/Low-noise%20osc%20app%20note.pdf (interesting!) regards, Gerhard ___ time-nuts mailing list -- time-nuts@febo.com javascript:; 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 javascript:; 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] Homebrew frequency counter, need help
On Thu, 27 Nov 2014 08:20:59 -0800, you wrote: Your project sounds wonderful. The TDC-GP22 has been mentioned only a few times over the years and I keep waiting for someone to post actual results from this chip, or better yet -- schematics, photos, and source code. Just happened to notice that there are actually a few breakout and development boards on aliexpress based on the TDC-GP21, which is very similar to the GP22. Nothing as impressive as a complete frequency counter of course, but might be a quick and painless way to start playing with the chip. Angus. ___ 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] tutorial on phase noise and PLLs?
I'm looking for a real short (3-4 slides or a website, really) description of why the phase noise of a PLL (microwave) looks the way it does, explaining (in sort of qualitative terms) how the phase noise transitions from the VCO (outside the loop bandwidth) to the reference (inside the loop bandwidth).. And in particular, what the phase noise curve looks like if the loop bandwidth is chosen incorrectly, or if the VCO or reference has more or less noise than expected. I figured before I wrote one up, if someone knows of one that's already out there, I could just point people to it. ___ 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] tutorial on phase noise and PLLs?
Hi Jim look here: http://www.gigatronics.com/uploads/document/AN-GT140A-Introduction-to-Phase-Noise-in-Signal-Generators.pdf 1981, /Dieter Scherer/, Generation of Low /Phase Noise/ Microwave Signals ... 1978, /Dieter Scherer/, Design Principles and Test Methods for Low /Phase Noise/ ... [http://www.hparchive.com/seminar_notes.htm ] https://www.febo.com/pages/sevhfs_2010/Oscillator%20Phase%20Noise%20%28SEVHFS%202010%29.pdf http://www.researchgate.net/publication/237674576_Generation_of_Low_Phase_Noise_Microwave_Signals 73 Alex On 12/4/2014 11:41 AM, Jim Lux wrote: I'm looking for a real short (3-4 slides or a website, really) description of why the phase noise of a PLL (microwave) looks the way it does, explaining (in sort of qualitative terms) how the phase noise transitions from the VCO (outside the loop bandwidth) to the reference (inside the loop bandwidth).. And in particular, what the phase noise curve looks like if the loop bandwidth is chosen incorrectly, or if the VCO or reference has more or less noise than expected. ___ 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] Questionable question about the Lucent RFTGs
I have sort of a dumb question about the Lucent KS-24361 RFTGs. Why do you suppose there is so much compute power in these units? They have the Xilinx FPGA, and the 68000 CPU just to discipline a 5 MHz oscillator? There must be more going on with these devices than meets my eyes. Thanks anyone, -Doug W6DSR ___ 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] LTE-Lite
David it always does a survey. Though even while doing that the frequency output is fine after its had a bit to stabilize. I wanted to bring the survey lamp out to a front panel LED however that appeared to be more work and risk then the value. The documentation says that from time to time it will do a re-survey. Frankly my units racked and stacked with dividers filters and line drivers for various frequencies I am using and its running very very smoothly. By the way at a huge power consumption of 1-3 watts. The power mete doesn't read well at this level. Regards Paul WB8TSL On Thu, Dec 4, 2014 at 11:07 AM, David J Taylor david-tay...@blueyonder.co.uk wrote: With the LTE-Lite, are the survey results held in non-volatile memory, or does it need to do a survey each time it is switched on? This is a fixed location. The survey light is still on after a number of hours of operation (but it may have gone off in the meanwhile), and the GPS light sometimes flashes and sometimes not. The signals I'm seeing at the moment are: 24 30 26 18 32 27 21 18 and 19 in the signal quality indicator of Visual GPS. This with the puck on the top storey of a two storey building, but indoors. Other GPS pucks work fine in the same location. The PPS output appears to be correct, and there is 20 MHz from the 20 MHz port, but nothing from the Clock Out port on this 10 MHz unit. The unit is as-received, with the exception of switching to NMEA sentences. Thanks, David -- SatSignal Software - Quality software written to your requirements Web: http://www.satsignal.eu Email: david-tay...@blueyonder.co.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.
Re: [time-nuts] Questionable question about the Lucent RFTGs
There is many little things it does spread-out over the second, but in the end, much of the time is spent in the idle-loop, as it should be. The processor is sufficiently large to handle processing and memory needs, and a suitable real-time OS can be run on it with debugging support, that eases on the development, so why make the design harder to do? Cheers, Magnus On 12/04/2014 09:03 PM, Doug Ronald wrote: I have sort of a dumb question about the Lucent KS-24361 RFTGs. Why do you suppose there is so much compute power in these units? They have the Xilinx FPGA, and the 68000 CPU just to discipline a 5 MHz oscillator? There must be more going on with these devices than meets my eyes. Thanks anyone, -Doug W6DSR ___ 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] tutorial on phase noise and PLLs?
Jim, On 12/04/2014 08:41 PM, Jim Lux wrote: I'm looking for a real short (3-4 slides or a website, really) description of why the phase noise of a PLL (microwave) looks the way it does, explaining (in sort of qualitative terms) how the phase noise transitions from the VCO (outside the loop bandwidth) to the reference (inside the loop bandwidth).. And in particular, what the phase noise curve looks like if the loop bandwidth is chosen incorrectly, or if the VCO or reference has more or less noise than expected. I figured before I wrote one up, if someone knows of one that's already out there, I could just point people to it. I could not find any useful presentation out of Enrico's large collection, but he and Ulrich is my usual suspects. But then, the best presentation I've seen was at the NIST seminar. Anyway, this TI paper gives you a good hint: http://www.ti.com/lit/an/scaa113/scaa113.pdf See how Fig 8 and Fig 9 provides two different cross-overs between the noise responces, and how the higher bandwidth doesn't have a hump just because the steered oscillators noise response get's sufficiently high-passed by the loop PLL as for the lower PLL it humps up because of them having comparable power (amplitudes yes, but their power adds, as it is noice). Maybe it is good enough for your purposes, but yes, I agree there should be a better presentation about the problem. 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] Questionable question about the Lucent RFTGs
Hi You need the FPGA to do the timing. A CPU / MCU is not fast enough or deterministic enough to do that. By today’s standards, that’s a small FPGA. The HP guys did not like to do assembly code if they could avoid it. The “lots of CPU” (for the day) let them run things like Forth. Again, these days that CPU is MCU sized. The next layer to all this is that they did a fairly fancy approach to the disciplining process. With SA enabled on GPS, they had to do more than you would have to do today. That more involved filtering (and hardware) is part of what makes them a pretty good box, even today. Bob On Dec 4, 2014, at 3:03 PM, Doug Ronald d...@dougronald.com wrote: I have sort of a dumb question about the Lucent KS-24361 RFTGs. Why do you suppose there is so much compute power in these units? They have the Xilinx FPGA, and the 68000 CPU just to discipline a 5 MHz oscillator? There must be more going on with these devices than meets my eyes. Thanks anyone, -Doug W6DSR ___ 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] tutorial on phase noise and PLLs?
See how Fig 8 and Fig 9 provides two different cross-overs between the noise responces, and how the higher bandwidth doesn't have a hump just because the steered oscillators noise response get's sufficiently high-passed by the loop PLL as for the lower PLL it humps up because of them having comparable power (amplitudes yes, but their power adds, as it is noice). Maybe it is good enough for your purposes, but yes, I agree there should be a better presentation about the problem. Another suggestion: fire up ADISimPLL and create a few different designs with various damping factors and combinations of VCO noise and loop BW. It'll only take a few minutes, and the resulting plots will show both the individual and summed contributions of the different noise sources in a way that will instantly clue people in. -- john, KE5FX Miles Design LLC ___ 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] tutorial on phase noise and PLLs?
Hi If you are using a simulator, you can *really* get confusing and toss in detector or divider noise floors …. Bob On Dec 4, 2014, at 6:45 PM, John Miles j...@miles.io wrote: See how Fig 8 and Fig 9 provides two different cross-overs between the noise responces, and how the higher bandwidth doesn't have a hump just because the steered oscillators noise response get's sufficiently high-passed by the loop PLL as for the lower PLL it humps up because of them having comparable power (amplitudes yes, but their power adds, as it is noice). Maybe it is good enough for your purposes, but yes, I agree there should be a better presentation about the problem. Another suggestion: fire up ADISimPLL and create a few different designs with various damping factors and combinations of VCO noise and loop BW. It'll only take a few minutes, and the resulting plots will show both the individual and summed contributions of the different noise sources in a way that will instantly clue people in. -- john, KE5FX Miles Design LLC ___ 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] Test, delete
This is only for testing my new email address. Don't answer. Sorry for the BW. Ignacio ___ 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] tutorial on phase noise and PLLs?
On 12/4/14, 2:59 PM, Magnus Danielson wrote: Jim, On 12/04/2014 08:41 PM, Jim Lux wrote: I'm looking for a real short (3-4 slides or a website, really) description of why the phase noise of a PLL (microwave) looks the way it does, explaining (in sort of qualitative terms) how the phase noise transitions from the VCO (outside the loop bandwidth) to the reference (inside the loop bandwidth).. And in particular, what the phase noise curve looks like if the loop bandwidth is chosen incorrectly, or if the VCO or reference has more or less noise than expected. I figured before I wrote one up, if someone knows of one that's already out there, I could just point people to it. I could not find any useful presentation out of Enrico's large collection, but he and Ulrich is my usual suspects. yeah, that's where I looked first.. ___ 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] Questionable question about the Lucent RFTGs
The Motorola 68000 CPU was available in 1982 (and a fine processor it was at the time). Aren't these units vintage 2000? Bill Hawkins -Original Message- From: Doug Ronald Sent: Thursday, December 04, 2014 2:03 PM I have sort of a dumb question about the Lucent KS-24361 RFTGs. Why do you suppose there is so much compute power in these units? They have the Xilinx FPGA, and the 68000 CPU just to discipline a 5 MHz oscillator? There must be more going on with these devices than meets my eyes. ___ 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] LTE-Lite
David it always does a survey. Though even while doing that the frequency output is fine after its had a bit to stabilize. I wanted to bring the survey lamp out to a front panel LED however that appeared to be more work and risk then the value. The documentation says that from time to time it will do a re-survey. Frankly my units racked and stacked with dividers filters and line drivers for various frequencies I am using and its running very very smoothly. By the way at a huge power consumption of 1-3 watts. The power mete doesn't read well at this level. Regards Paul WB8TSL == Thanks, Paul. I had rather hoped that there might be some EEPROM in one of the chips where the data was stored, oh well! I wonder just how long a bit to stabilize takes? I might have mine on 24 x 7, but I might not... My survey LED has still not gone out despite the unit being on overnight, and the Alarm LED is lit, so I wish there was a way of relaxing the survey constraints a little to get the survey complete. Viewing the NMEA output with either Visual GPS or the U-blox software suggests that, despite good signals, the unit is only getting lock half the time. The positions it produces are correct. I read in the documentation that the serial/USB data is output only, though. (I was wrong on the 10 MHz output being 20 MHz, I forget my other reference was 5 MHz.) 73, David GM8ARV -- SatSignal Software - Quality software written to your requirements Web: http://www.satsignal.eu Email: david-tay...@blueyonder.co.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.
