Re: [time-nuts] Price of LTE Lite GPSDO vs Trimble Thunderbolt.
Hi, I am interested in your new GPSDO. How do I find out more about buying the kit? Is this a USA only deal? cheers, Neville Michie Sydney, Australia On 18/10/2014, at 9:35 AM, S. Jackson via time-nuts wrote: LTE Lite GPSDO ___ 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] Price of LTE Lite GPSDO vs Trimble Thunderbolt.
Hi, I am interested in your new GPSDO. How do I find out more about buying the kit? Is this a USA only deal? cheers, Neville Michie Sydney, Australia = Neville, As the man said, search eBay for LTE Lite GPSDO. Cheers, 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] LTE-Lite module
I look forward to the app note. Might be the incentive to get me to actually USE the Express PCB software I have. Jim On 10/17/2014 4:40 PM, S. Jackson via time-nuts wrote: Hi there, I don't know how much the Wenzel units are, but if someone is not able to, or willing to build one on their own then this could be a viable alternative. I will look into writing a short appnote describing how a low-noise div-by-2 can be built at home with minimal components using a surface mount '74 chip and a couple of passives. Lastly the 20MHz LTE-Lite boards do generate a 10MHz output of course, and if you feed that into a standard counter (5370B, 53132A etc etc) I think the noise floor of the counter would be higher than the noise floor of the synthesized 10MHz output, so you would not see any difference between using the noisier synthesized output and the low-noise 10MHz TCXO divided output.. Bye, Said In a message dated 10/17/2014 13:19:08 Pacific Daylight Time, gign...@gmail.com writes: How much would we guess that Wenzel blue-top would run you? Relative to the low cost GPSDO, my understanding is the Wenzel parts are priced appropriately to their quality. On Fri, Oct 17, 2014 at 11:32 AM, S. Jackson via time-nuts _time-nuts@febo.com_ (mailto:time-nuts@febo.com) wrote: Hello Jim, let me answer through Time Nuts as this may interest other parties as well. Yes, using a fast flip flop to generate 10MHz out of the 20MHz TCXO 3.0V CMOS output from the LTE-Lite module will preserve the phase noise (actually improve it by up to 6dB due to the 20log(n/m) noise improvement) and will not add any spurs if you use the clean 3.0V output from the LTE-Lite module or an external clean power supply (please note the LTE-Lite TCXO RF output is 3.0V due to the internal 3.3V to 3.0V Low Noise regulator feeding the TCXO and buffer). Use fast logic such as 74AC74, 74FCT74, or the like. We do exactly that on our ULN-2550 boards to generate 50MHz and 25MHz out of the 100MHz, and using a fast CMOS divider will result in additive phase noise that will be below the crystal oscillator phase noise floor. That will result in significantly better phase noise and much lower spurs than using the synthesized 10MHz output from the board, and one 74' chip can generate both 10MHz and 5MHz out of the 20MHz LTE-Lite output. This is exactly what we would do here if we needed a clean 10MHz from the 20MHz LTE-Lite board. I believe you can order low-noise divide-by-2 blue-top boxes from Wenzel already packaged-up and connectorized as well. Hope that helps, Said Hi Said I was one of those looking for 10Mhz but I just thought again now that it might be just as well to divide the standard 20Mhz output by 2 using a FF. I think that would preserve all the desirable characteristics of the 20Mhz signal which I understand to just be square wave at CMOS 3.3v levels anyway. Is that correct? Thanks Jim ___ time-nuts mailing list -- _time-nuts@febo.com_ (mailto: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. --- This email is free from viruses and malware because avast! Antivirus protection is active. http://www.avast.com ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Price of LTE Lite GPSDO vs Trimble Thunderbolt.
Hi My intent was *not* to knock anybody’s input. Far from it. My only intent was to point out that we are heading off comparing very different apples to very different oranges. Bob On Oct 17, 2014, at 10:49 PM, Pete Lancashire p...@petelancashire.com wrote: I'm sorry for what I wrote -pete bye … On Fri, Oct 17, 2014 at 7:46 PM, Pete Lancashire p...@petelancashire.com wrote: No where did I mention comparing specifications. It was a statement of an individual Joe being able to get a GPDSO for a very reasonable amount. Just a usable GPDSO nothing else. On Fri, Oct 17, 2014 at 6:14 PM, Bob Camp kb...@n1k.org wrote: Hi The question on all of these setups is very much - what do you need? The T-Bolt was designed to meet some very specific requirements. It’s got an OCXO onboard because of that. A 48 hour battery backed Rb does something very different, it’s got different costs associated with it. A modern / up to date TCXO based unit makes some compromises to trade off against power and size. Depending on what your system needs are, each of the first two may uniquely fill a bill that the others will not and can not. If you need to run 120 days on battery, the third will win the contest easily. If you want to run on something other than GPS, number 3 is your choice. Cost wise, it all depends on when you bought what. I have Rb’s that cost less than $40 and T-Bolts that cost less than $100. You can still get surplus T-Bolt like objects (OCXO based surplus GPSDO’s) for under $130. I also have some stuff I’ve bought on eBay (and other surplus outlets) over the years that turned out to be less than perfect. Depending on surplus gear in a commercial system would be silly compared to using newly manufactured parts. It all depends on what you need. Bob On Oct 17, 2014, at 5:19 PM, paul swed paulsw...@gmail.com wrote: Don't want to hijack any discussion and am looking forward to the ebay site and ordering. Whats amazing is the power spec in addition to other specs. I rechecked the spec 1/16th watt at 3.3V. My RB in the basement draws 24 watts just idling along and keeping two hefty SLA batteries charged for a 48 hour run time if needed. I can clearly see the case of careful support system design such that a battery set can be charged and even in a power failure run several days on a small battery. SLA 7 amp was something like 100 plus hours. Bert introduced me to some of the Lithium battery technologies that can be had for reasonable cost and are small and dense. But that said really no need for a battery since restarts are fast... Lots to think about. Like LEDs drawing more power then the system and sloppy base power supplies wasting power. Regards Paul WB8TSL On Fri, Oct 17, 2014 at 4:53 PM, Pete Lancashire p...@petelancashire.com wrote: Sorry to create any misunderstanding I was saying thanks to TVB/TAPR for all their effort, and Said/JLT for doing what they did for the group I was in no way comparing the used Thunderbolts to the LTE Lite. -pete On Fri, Oct 17, 2014 at 1:13 PM, Jim Sanford wb4...@wb4gcs.org wrote: And, somehow I expect that my LTE-LITE will actually work, which my thunderbolt never did. (Very noisy) It continues to collect dust On 10/17/2014 3:49 PM, Pete Lancashire wrote: First three cheers to LTE for making these available. It reminds me when Motorola made a developers kit for the then new 68HC11 MCU available for $68.11. I know of one design win they got that more then made of their marketing costs. Another that hit me is with inflation the LTE Lite is not much more then what many of us paid for our Thunderbolts. For those new to the list ... https://www.febo.com/pipermail/time-nuts/2008-May/031100.html http://www.leapsecond.com/pages/tapr-tbolt/ In 2008, $124, the LTE Lite in 2014 $195. With 'real' inflation (not the 11% you get online) the $71 difference is not much more. My two backup Thunderbolts cost me $145 each, just before they hit $200 then became history. Again thanks to Said and JLT -pete ___ 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. --- This email is free from viruses and malware because avast! Antivirus protection is active. http://www.avast.com ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/ mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts
Re: [time-nuts] LTE-Lite module
On 17 Oct 2014 19:33, S. Jackson via time-nuts time-nuts@febo.com wrote: Hello Jim, let me answer through Time Nuts as this may interest other parties as well. Yes, using a fast flip flop to generate 10MHz out of the 20MHz TCXO 3.0V CMOS output from the LTE-Lite module will preserve the phase noise (actually improve it by up to 6dB due to the 20log(n/m) noise improvement) Hi Said, I am only looking for a good clean 10 MHz reference for my lab to feed into instruments like my SA, VNA, signal generator etc. Would I be right in concluding the best way to achieve this is to use the 20 MHz version and the simple divide by 2 that you showed? I was going to place an order for the 10 MHz version, despite the long lead time, but if I understand you correctly I would get better performance in less time by going for the 20 MHz version and a ÷2. The other thing I am not so sure about is what the specification of the external TCXO/OCXO needs to be. I gather it is 3.3 V, but does it need to generate a sine or square wave? What amolitude? I was wondering if there would be some advantage in using a 10 MHz OCXO, such as an HP 10811A rather than the inbuilt TCXO. Without knowing what your board expects to see, it is impossible to know what to type to add. Dave and will not add any spurs if you use the clean 3.0V output from the LTE-Lite module or an external clean power supply (please note the LTE-Lite TCXO RF output is 3.0V due to the internal 3.3V to 3.0V Low Noise regulator feeding the TCXO and buffer). Use fast logic such as 74AC74, 74FCT74, or the like. We do exactly that on our ULN-2550 boards to generate 50MHz and 25MHz out of the 100MHz, and using a fast CMOS divider will result in additive phase noise that will be below the crystal oscillator phase noise floor. That will result in significantly better phase noise and much lower spurs than using the synthesized 10MHz output from the board, and one 74' chip can generate both 10MHz and 5MHz out of the 20MHz LTE-Lite output. This is exactly what we would do here if we needed a clean 10MHz from the 20MHz LTE-Lite board. I believe you can order low-noise divide-by-2 blue-top boxes from Wenzel already packaged-up and connectorized as well. Hope that helps, Said Hi Said I was one of those looking for 10Mhz but I just thought again now that it might be just as well to divide the standard 20Mhz output by 2 using a FF. I think that would preserve all the desirable characteristics of the 20Mhz signal which I understand to just be square wave at CMOS 3.3v levels anyway. Is that correct? Thanks Jim ___ 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] Price of LTE Lite GPSDO vs Trimble Thunderbolt.
See http://www.ebay.com/itm/LTE-Lite-GPSDO-Evaluation-Kit-with-20MHz-TCXO-/171504586548 Ships World wide for $10 US Regards, John K1AE Hi, I am interested in your new GPSDO. How do I find out more about buying the kit? Is this a USA only deal? cheers, Neville Michie Sydney, Australia On 18/10/2014, at 9:35 AM, S. Jackson via time-nuts wrote: LTE Lite GPSDO ___ 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 module
Hi For a lab reference, “clean” is a relative term. Most (as in every one I’ve ever seen) instruments expect a dirty signal on the reference input. They phase lock an internal oscillator to clean it up. Past some (unfortunately variable) offset, the reference signal has no impact on the instrument at all. In most cases, that offset is below 50 Hz in order to reject power line induced spurs on the reference signal. Yes, phase noise inside 10 or 20 Hz may matter. ADEV at 1 sec and longer is probably a better thing to look at. How good does it need to be? Most counters are quite happy with an ADEV at the 1x10^-11 level at 1 second. VNA’s and spectrum analyzers will be happy with something even less stable. Synthesizers will (ultimately) pass along what ever is on the reference to the output. Your specific test application will dictate if a 1x10^-12 wander at 100,000 seconds on your synthesizer is important or not. Bob On Oct 18, 2014, at 9:34 AM, Dr. David Kirkby (Kirkby Microwave Ltd) drkir...@kirkbymicrowave.co.uk wrote: On 17 Oct 2014 19:33, S. Jackson via time-nuts time-nuts@febo.com wrote: Hello Jim, let me answer through Time Nuts as this may interest other parties as well. Yes, using a fast flip flop to generate 10MHz out of the 20MHz TCXO 3.0V CMOS output from the LTE-Lite module will preserve the phase noise (actually improve it by up to 6dB due to the 20log(n/m) noise improvement) Hi Said, I am only looking for a good clean 10 MHz reference for my lab to feed into instruments like my SA, VNA, signal generator etc. Would I be right in concluding the best way to achieve this is to use the 20 MHz version and the simple divide by 2 that you showed? I was going to place an order for the 10 MHz version, despite the long lead time, but if I understand you correctly I would get better performance in less time by going for the 20 MHz version and a ÷2. The other thing I am not so sure about is what the specification of the external TCXO/OCXO needs to be. I gather it is 3.3 V, but does it need to generate a sine or square wave? What amolitude? I was wondering if there would be some advantage in using a 10 MHz OCXO, such as an HP 10811A rather than the inbuilt TCXO. Without knowing what your board expects to see, it is impossible to know what to type to add. Dave and will not add any spurs if you use the clean 3.0V output from the LTE-Lite module or an external clean power supply (please note the LTE-Lite TCXO RF output is 3.0V due to the internal 3.3V to 3.0V Low Noise regulator feeding the TCXO and buffer). Use fast logic such as 74AC74, 74FCT74, or the like. We do exactly that on our ULN-2550 boards to generate 50MHz and 25MHz out of the 100MHz, and using a fast CMOS divider will result in additive phase noise that will be below the crystal oscillator phase noise floor. That will result in significantly better phase noise and much lower spurs than using the synthesized 10MHz output from the board, and one 74' chip can generate both 10MHz and 5MHz out of the 20MHz LTE-Lite output. This is exactly what we would do here if we needed a clean 10MHz from the 20MHz LTE-Lite board. I believe you can order low-noise divide-by-2 blue-top boxes from Wenzel already packaged-up and connectorized as well. Hope that helps, Said Hi Said I was one of those looking for 10Mhz but I just thought again now that it might be just as well to divide the standard 20Mhz output by 2 using a FF. I think that would preserve all the desirable characteristics of the 20Mhz signal which I understand to just be square wave at CMOS 3.3v levels anyway. Is that correct? Thanks Jim ___ 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] Lightning arrestors for GPSDO antenna
Chris Albertson wrote: On Thu, Oct 16, 2014 at 7:51 PM, Dave M dgmin...@mediacombb.net wrote: Thanks, Chris. I've done a bit or research on the subject, and think I have a reasonable grip on the necessary steps. I have an 8' ground rod driven into the ground directly under the spot where my antennas mount. #6 solid copper from the rod to a heavy aluminum plate, where the arrestors will be mounted. A #6 solid copper wire from the plate to the antenna mounting structure. About the only thing you left out is the interconnection between this new ground rod and the existing house ground. Sounds like you must live in Florida. The best source of information is the lightening lab at University of FL. I've never read a good research backed paper on plastic v. metal conduit. I bet it does matter. I use iron pipe outdoors then after it gets indoors switch to plastic. Practical reasons. The flexible plastic conduit is just easier to use Actually, I lived in Florida for about 40 years, retiring to north Alabama about 5 years ago. about 6 of those years were spent working at a Motorola 2-way radio shop. So, yes, I'm pretty familiar with the damages that lightning can cause, and some of the precautions that help minimize susceptability and damage. As I posted earlier, I've seen writings promoting metallic and non-metallic conduit for the antenna coax. I can see reasons for placing the coax in metallic conduit. But, one thing that I've read that is consistent, is NOT to run the earth ground wire in metallic conduit. That's to keep the current to ground in a solid, unbroken path, which the fittings used to join conduit can't provide. OK to run it in non-metallic conduit to keep it out of the weather. Since my coax run is only about 20 ft, I'm thinking that I should be OK with the coax in 1/2 galvanized steel conduit. I agree that the metallic conduit should stay outside, and not be connected to the equipment ground inside. I'll run a separate ground wire from the equipment rack to the ground rod outside. Cheers, Dave M ___ 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] Price of LTE Lite GPSDO vs Trimble Thunderbolt.
See http://www.ebay.com/itm/LTE-Lite-GPSDO-Evaluation-Kit-with-20MHz-TCXO-/171504586548 Ships World wide for $10 US Regards, John K1AE === Well, no. If I look at that entry from the UK it says: $24.75 USPS Priority Mail International Small Flat Rate Box so it's not US $10 worldwide. 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] LTE-Lite module
Hi guys, lots of questions, let me try to answer some of these. Bob, David, et. al, thanks for answering some of these already! Dave, as Bob said it depends on your application -- and your time frame. Also, please check the FAQ for an answer on the external TCXO requirement, specifically item 35. in the FAQ on the Ebay website for the product. Jim, I ended up doing the appnote in email format, and sending out a description, schematics, PN plot, and photos yesterday, please check your emails. I won't do a formal appnote, sorry no time.. I hope the description of what I wired-up yesterday is good enough for folks to try the same. Ernie, as mentioned here the price is $185 plus shipping on Ebay for the entire kit. Shipping is calculated by Ebay, and should be a flat-rate of $10 in the continental US Hal, MY BAD!! I should have known better and super-imposed both the original 20MHz and 10MHz plots on the same plot. I will do so shortly. On the table in the plot: the TimePod tries to determine spurs, and display them on the upper right hand of the plot in a table, and with the phase noise being as clean as it is I guess the TimePod software could only find two spurs, one at 0.8 and one at 0.9Hz offset from carrier, which was not even shown in that plot since it starts at 1Hz. Thanks so much for your feedback, lively discussion, and good questions guys. I hope that answers all questions, bye, Said In a message dated 10/18/2014 10:43:40 Pacific Daylight Time, kb...@n1k.org writes: Hi For a lab reference, “clean” is a relative term. Most (as in every one I’ ve ever seen) instruments expect a dirty signal on the reference input. They phase lock an internal oscillator to clean it up. Past some (unfortunately variable) offset, the reference signal has no impact on the instrument at all. In most cases, that offset is below 50 Hz in order to reject power line induced spurs on the reference signal. Yes, phase noise inside 10 or 20 Hz may matter. ADEV at 1 sec and longer is probably a better thing to look at. How good does it need to be? Most counters are quite happy with an ADEV at the 1x10^-11 level at 1 second. VNA’s and spectrum analyzers will be happy with something even less stable. Synthesizers will (ultimately) pass along what ever is on the reference to the output. Your specific test application will dictate if a 1x10^-12 wander at 100,000 seconds on your synthesizer is important or not. Bob On Oct 18, 2014, at 9:34 AM, Dr. David Kirkby (Kirkby Microwave Ltd) drkir...@kirkbymicrowave.co.uk wrote: On 17 Oct 2014 19:33, S. Jackson via time-nuts time-nuts@febo.com wrote: Hello Jim, let me answer through Time Nuts as this may interest other parties as well. Yes, using a fast flip flop to generate 10MHz out of the 20MHz TCXO 3.0V CMOS output from the LTE-Lite module will preserve the phase noise (actually improve it by up to 6dB due to the 20log(n/m) noise improvement) Hi Said, I am only looking for a good clean 10 MHz reference for my lab to feed into instruments like my SA, VNA, signal generator etc. Would I be right in concluding the best way to achieve this is to use the 20 MHz version and the simple divide by 2 that you showed? I was going to place an order for the 10 MHz version, despite the long lead time, but if I understand you correctly I would get better performance in less time by going for the 20 MHz version and a ÷2. The other thing I am not so sure about is what the specification of the external TCXO/OCXO needs to be. I gather it is 3.3 V, but does it need to generate a sine or square wave? What amolitude? I was wondering if there would be some advantage in using a 10 MHz OCXO, such as an HP 10811A rather than the inbuilt TCXO. Without knowing what your board expects to see, it is impossible to know what to type to add. Dave and will not add any spurs if you use the clean 3.0V output from the LTE-Lite module or an external clean power supply (please note the LTE-Lite TCXO RF output is 3.0V due to the internal 3.3V to 3.0V Low Noise regulator feeding the TCXO and buffer). Use fast logic such as 74AC74, 74FCT74, or the like. We do exactly that on our ULN-2550 boards to generate 50MHz and 25MHz out of the 100MHz, and using a fast CMOS divider will result in additive phase noise that will be below the crystal oscillator phase noise floor. That will result in significantly better phase noise and much lower spurs than using the synthesized 10MHz output from the board, and one 74' chip can generate both 10MHz and 5MHz out of the 20MHz LTE-Lite output. This is exactly what we would do here if we needed a clean 10MHz from the 20MHz LTE-Lite board. I believe you can order low-noise divide-by-2 blue-top boxes from Wenzel already packaged-up and connectorized as well. Hope that helps, Said Hi Said I was
[time-nuts] LTE-Lite module
Guys, we have been getting a good number of emails with questions that have already been addressed in the user manual or the FAQ, see the below link. We spent a lot of time putting the collateral together, may I please ask that you first look into these two documents to see if your question might already be addressed there? Paul, please search the LTE Lite user manual for Hammond and you will find it there: http://www.jackson-labs.com/index.php/products/lte_lite Thanks, Said _ Do you have a recommended Hammond chassis part number? -- Paul ___ 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] Price of LTE Lite GPSDO vs Trimble Thunderbolt.
Hello Mr Richard, that's a first! While I lived in Germany for almost 2 decades, I am not sure what other connection the listing could have to Nazi propaganda??! If anyone has any suggestions how to reword the listing I would love to hear them. For now, can you use a proxy server to get access to the site? Don't we just love internet censorship. Bye, Said In a message dated 10/18/2014 12:35:27 Pacific Daylight Time: Mr Jackson, May I suggest you rewrite the eBay description for the LTE-Lite. As it stands, it triggers the anti-nazi filters that block some items from being displayed in France possibly some other countries (at least Germany and Austria): Unfortunately, access to this particular item has been blocked due to legal restrictions in some countries. We are blocking your viewing in an effort to prevent restricted items from being displayed. Regrettably, in some cases, we may prevent users from accessing items that are not within the scope of said restrictions because of limitations of existing technology. Please accept our apologies for any inconvenience this may cause, and we hope you may find other items of interest on eBay. Best regards, Sylvain RICHARD Le 18/10/2014 19:58, David J Taylor a écrit : See http://www.ebay.com/itm/LTE-Lite-GPSDO-Evaluation-Kit-with-20MHz-TCXO-/171504586548 Ships World wide for $10 US Regards, John K1AE === Well, no. If I look at that entry from the UK it says: $24.75 USPS Priority Mail International Small Flat Rate Box so it's not US $10 worldwide. David ___ 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 module
Hal, attached is the superimposed plot of the standard 20MHz TCXO Phase Noise and the 10MHz output of my bare-bones divide by 2 flip-flop. The green trace is the new 20MHz plot, the blue the one I had sent out yesterday at 10MHz, both sourced from the same TCXO. You can nicely see that the noise improves by almost exactly 6dB at 100Hz just as theory would have it. One problem is that my reference has only a noise floor of about -160dBc/Hz at 10MHz, so when I measure 20MHz signals that actually degrades to the equivalent of -154dBc/Hz due to the reference noise floor. Are these plots going to be the same on all the boards? No, these are typical plots for the particular random unit I tested here, and my particular test setup. Some of the units will have better noise, some worse. The variations in performance from crystal to crystal have been discussed here on this email list many times in the past. BTW: we recently noticed a very peculiar caveat: When plugging in the external TCXO (and by the way we decided to mount a TCXO socket on every one of the eval kits to make life easier for everyone) and running from the external TCXO there could be a beat frequency from the internal TCXO, because while the output of the internal TCXO is disabled, the crystal itself is still powered up and running and thus causing a slight interference with the external TCXO. What happens when an external 10MHz TCXO is plugged in with the internal 20MHz TCXO is that there is harmonic mixing at 20MHz, 30MHz etc, and due to the fact that only the external TCXO is disciplined (the internal TCXO gets the same exact EFC voltage but will run at a harmonic offset of typically many hertz) there is a beat frequency that results. On our particular unit with 20MHz internal TCXO and 10MHz external TCXO that beat frequency happens to be about 10Hz between the two crystals. So this results in a number of fairly strong spurs at 10Hz, 20Hz, 30Hz, etc etc offsets from the carrier. To fix that issue there are two solutions: 1) Use an external TCXO that is not harmonically related to the internal TCXO. Such as 10MHz on a 19.2MHz board, or 15.36MHz on a 20MHz board. I realize that this may not be practical 2) remove the internal TCXO carefully with a heat-gun when using the external TCXO Unfortunately we have no way to power-off the internal TCXO completely, and we cannot avoid physics.. The 10MHz boards with external TCXO won't have this problem as there will not be a small SMT TCXO mounted on the LTE-Lite module itself, so no harmonic mixing will happen. Bye, Said In a message dated 10/18/2014 00:36:27 Pacific Daylight Time, hmur...@megapathdsl.net writes: Here is the resulting 10MHz phase noise plot from the 20MHz TCXO output: There is a box in the upper right that says -76.8 dBc at 0.8 Hz and -85 dBc at 0.9 Hz. I can't make sense out of that. It's off scale to the left of the plot, but looks like it would be higher than those values. It would be neat to see the phase noise of the un-divided 20 Mhz OSC and also the 10 MHz OSC. -- These are my opinions. I hate spam. LTE_10MHz_divide-by-2_PN_and-20MHz.png Description: Binary data ___ 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] unexpected blocks Re: Price of LTE Lite GPSDO vs Trimble Thunderbolt.
Maybe it's a which address range you are in or some sort of confusion in the filter algorithm. I get blocked from sites at MIT from JPL at work all the time (usually when trying to get at someones dissertation or presentation slides). Generally, at JPL we have a soft block. you get a message along the lines of this site is potentially malicious, you can continue on, but your access is being logged, and if you want a permanent white list contact us. I understand it is because MIT has a fairly liberal policy on what you can hook up to the network there, so there have been some bad sites within their IP address range (which is what the block is based on). Some GoDaddy IP ranges have the same issue. On 10/18/14, 1:02 PM, S. Jackson via time-nuts wrote: Hello Mr Richard, that's a first! While I lived in Germany for almost 2 decades, I am not sure what other connection the listing could have to Nazi propaganda??! If anyone has any suggestions how to reword the listing I would love to hear them. For now, can you use a proxy server to get access to the site? Don't we just love internet censorship. Bye, Said In a message dated 10/18/2014 12:35:27 Pacific Daylight Time: Mr Jackson, May I suggest you rewrite the eBay description for the LTE-Lite. As it stands, it triggers the anti-nazi filters that block some items from being displayed in France possibly some other countries (at least Germany and Austria): Unfortunately, access to this particular item has been blocked due to legal restrictions in some countries. We are blocking your viewing in an effort to prevent restricted items from being displayed. Regrettably, in some cases, we may prevent users from accessing items that are not within the scope of said restrictions because of limitations of existing technology. Please accept our apologies for any inconvenience this may cause, and we hope you may find other items of interest on eBay. Best regards, ___ 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] Price of LTE Lite GPSDO vs Trimble Thunderbolt.
Said I read through the description carefully .I suggest you request a refund from eBay for their use of incompetant computer translation which fails to recognise English technical words and phases, so blocking your paid for posting. The trigger can only be due to a stupid word selection in translation. I can see no English (or American :-)) ) word that could be responsible. Alan G3NYK - Original Message - From: S. Jackson via time-nuts time-nuts@febo.com To: sylva...@netcourrier.com; time-nuts@febo.com Sent: Saturday, October 18, 2014 9:02 PM Subject: Re: [time-nuts] Price of LTE Lite GPSDO vs Trimble Thunderbolt. Hello Mr Richard, that's a first! While I lived in Germany for almost 2 decades, I am not sure what other connection the listing could have to Nazi propaganda??! If anyone has any suggestions how to reword the listing I would love to hear them. For now, can you use a proxy server to get access to the site? Don't we just love internet censorship. Bye, Said In a message dated 10/18/2014 12:35:27 Pacific Daylight Time: Mr Jackson, May I suggest you rewrite the eBay description for the LTE-Lite. As it stands, it triggers the anti-nazi filters that block some items from being displayed in France possibly some other countries (at least Germany and Austria): Unfortunately, access to this particular item has been blocked due to legal restrictions in some countries. We are blocking your viewing in an effort to prevent restricted items from being displayed. Regrettably, in some cases, we may prevent users from accessing items that are not within the scope of said restrictions because of limitations of existing technology. Please accept our apologies for any inconvenience this may cause, and we hope you may find other items of interest on eBay. Best regards, Sylvain RICHARD Le 18/10/2014 19:58, David J Taylor a écrit : See http://www.ebay.com/itm/LTE-Lite-GPSDO-Evaluation-Kit-with-20MHz-TCXO-/171504586548 Ships World wide for $10 US Regards, John K1AE === Well, no. If I look at that entry from the UK it says: $24.75 USPS Priority Mail International Small Flat Rate Box so it's not US $10 worldwide. David ___ 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] Price of LTE Lite GPSDO vs Trimble Thunderbolt.
Thanks much Alan! It would be funny if it wasn't so serious. Guys let me know (but please without copying the entire list!) if Ebay is not working out for you and we will find a way.. Bye, Said Sent From iPhone On Oct 18, 2014, at 13:34, Alan Melia alan.me...@btinternet.com wrote: Said I read through the description carefully .I suggest you request a refund from eBay for their use of incompetant computer translation which fails to recognise English technical words and phases, so blocking your paid for posting. The trigger can only be due to a stupid word selection in translation. I can see no English (or American :-)) ) word that could be responsible. Alan G3NYK - Original Message - From: S. Jackson via time-nuts time-nuts@febo.com To: sylva...@netcourrier.com; time-nuts@febo.com Sent: Saturday, October 18, 2014 9:02 PM Subject: Re: [time-nuts] Price of LTE Lite GPSDO vs Trimble Thunderbolt. Hello Mr Richard, that's a first! While I lived in Germany for almost 2 decades, I am not sure what other connection the listing could have to Nazi propaganda??! If anyone has any suggestions how to reword the listing I would love to hear them. For now, can you use a proxy server to get access to the site? Don't we just love internet censorship. Bye, Said In a message dated 10/18/2014 12:35:27 Pacific Daylight Time: Mr Jackson, May I suggest you rewrite the eBay description for the LTE-Lite. As it stands, it triggers the anti-nazi filters that block some items from being displayed in France possibly some other countries (at least Germany and Austria): Unfortunately, access to this particular item has been blocked due to legal restrictions in some countries. We are blocking your viewing in an effort to prevent restricted items from being displayed. Regrettably, in some cases, we may prevent users from accessing items that are not within the scope of said restrictions because of limitations of existing technology. Please accept our apologies for any inconvenience this may cause, and we hope you may find other items of interest on eBay. Best regards, Sylvain RICHARD Le 18/10/2014 19:58, David J Taylor a écrit : See http://www.ebay.com/itm/LTE-Lite-GPSDO-Evaluation-Kit-with-20MHz-TCXO-/171504586548 Ships World wide for $10 US Regards, John K1AE === Well, no. If I look at that entry from the UK it says: $24.75 USPS Priority Mail International Small Flat Rate Box so it's not US $10 worldwide. David ___ 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] Price of LTE Lite GPSDO vs Trimble Thunderbolt.
living in switzerland, i have encountered that problem several times. ebay blocks pages from certain sellers for reasons i do not know. a good seller from china, just as an example, does not show up when i use firefeox to access ebay. same with said's pages. i recommend using the TorBrowser. it veils your identity and you see all those hidden pages and stores on ebay, including said's lte gpsdo. i don't think it has anything to do with the wording. or nazi-stuff... this direct link may work as well: http://www.ebay.com/sch/i.html?_from=R40_trksid=p2050601.m570.l1313.TR0.TRC0.H0.Xlte+gpsdo_nkw=lte+gpsdo_sacat=0 hans Said I read through the description carefully .I suggest you request a refund from eBay for their use of incompetant computer translation which fails to recognise English technical words and phases, so blocking your paid for posting. The trigger can only be due to a stupid word selection in translation. I can see no English (or American :-)) ) word that could be responsible. Alan G3NYK - Original Message - From: S. Jackson via time-nuts time-nuts at febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts To: sylvainr at netcourrier.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts; time-nuts at febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts Sent: Saturday, October 18, 2014 9:02 PM Subject: Re: [time-nuts] Price of LTE Lite GPSDO vs Trimble Thunderbolt. / Hello Mr Richard, // // that's a first! While I lived in Germany for almost 2 decades, I am not // sure what other connection the listing could have to Nazi propaganda??! // // If anyone has any suggestions how to reword the listing I would love to // hear them. // // For now, can you use a proxy server to get access to the site? Don't we // just love internet censorship. // // Bye, // Said // // // In a message dated 10/18/2014 12:35:27 Pacific Daylight Time: // // Mr Jackson, // // May I suggest you rewrite the eBay description for the LTE-Lite. As it // stands, it triggers the anti-nazi filters that block some items from // being displayed in France possibly some other countries (at least // Germany and Austria): // Unfortunately, access to this particular item has been blocked due to // legal restrictions in some countries. We are blocking your viewing in // an effort to prevent restricted items from being displayed. // Regrettably, in some cases, we may prevent users from accessing items // that are not within the scope of said restrictions because of // limitations of existing technology. Please accept our apologies for // any inconvenience this may cause, and we hope you may find other items // of interest on eBay. // // Best regards, // // Sylvain RICHARD/ ___ 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] Lightning arrestors for GPSDO antenna
FWIW, when grounding the metal mast of a boat, three inch wide copper strap is used because it is a better RF conductor. The strap is available in marine supply stores. You really don't want lightning punching one or more holes in your boat, so whatever hits the mast (usually the full stroke, not a side shoot) gets directed directly to the keel. IIRC, gas discharge tubes take some time to ignite, so something faster is required to take the initial current. Bill Hawkins -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Dave M Sent: Saturday, October 18, 2014 12:48 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Lightning arrestors for GPSDO antenna Chris Albertson wrote: On Thu, Oct 16, 2014 at 7:51 PM, Dave M dgmin...@mediacombb.net wrote: Thanks, Chris. I've done a bit or research on the subject, and think I have a reasonable grip on the necessary steps. I have an 8' ground rod driven into the ground directly under the spot where my antennas mount. #6 solid copper from the rod to a heavy aluminum plate, where the arrestors will be mounted. A #6 solid copper wire from the plate to the antenna mounting structure. About the only thing you left out is the interconnection between this new ground rod and the existing house ground. Sounds like you must live in Florida. The best source of information is the lightening lab at University of FL. I've never read a good research backed paper on plastic v. metal conduit. I bet it does matter. I use iron pipe outdoors then after it gets indoors switch to plastic. Practical reasons. The flexible plastic conduit is just easier to use Actually, I lived in Florida for about 40 years, retiring to north Alabama about 5 years ago. about 6 of those years were spent working at a Motorola 2-way radio shop. So, yes, I'm pretty familiar with the damages that lightning can cause, and some of the precautions that help minimize susceptability and damage. As I posted earlier, I've seen writings promoting metallic and non-metallic conduit for the antenna coax. I can see reasons for placing the coax in metallic conduit. But, one thing that I've read that is consistent, is NOT to run the earth ground wire in metallic conduit. That's to keep the current to ground in a solid, unbroken path, which the fittings used to join conduit can't provide. OK to run it in non-metallic conduit to keep it out of the weather. Since my coax run is only about 20 ft, I'm thinking that I should be OK with the coax in 1/2 galvanized steel conduit. I agree that the metallic conduit should stay outside, and not be connected to the equipment ground inside. I'll run a separate ground wire from the equipment rack to the ground rod outside. Cheers, Dave M ___ 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] Price of LTE Lite GPSDO vs Trimble Thunderbolt.
nope, sorry, link does not work... but these should: 20 mhz: http://www.ebay.com/itm/LTE-Lite-GPSDO-Evaluation-Kit-with-20MHz-TCXO-/171504586548?pt=LH_DefaultDomain_0hash=item27ee784f34 10 mhz: http://www.ebay.com/itm/LTE-Lite-GPSDO-Evaluation-Kit-with-10MHz-TCXO-/171504585820?pt=LH_DefaultDomain_0hash=item27ee784c5c 19.2 mhz: http://www.ebay.com/itm/LTE-Lite-GPSDO-Evaluation-Kit-with-19-2MHz-TCXO-/171504588307?pt=LH_DefaultDomain_0hash=item27ee785613 best regards, hans living in switzerland, i have encountered that problem several times. ebay blocks pages from certain sellers for reasons i do not know. a good seller from china, just as an example, does not show up when i use firefeox to access ebay. same with said's pages. i recommend using the TorBrowser. it veils your identity and you see all those hidden pages and stores on ebay, including said's lte gpsdo. i don't think it has anything to do with the wording. or nazi-stuff... this direct link may work as well:http://www.ebay.com/sch/i.html?_from=R40_trksid=p2050601.m570.l1313.TR0.TRC0.H0.Xlte+gpsdo_nkw=lte+gpsdo_sacat=0 hans Said I read through the description carefully .I suggest you request a refund from eBay for their use of incompetant computer translation which fails to recognise English technical words and phases, so blocking your paid for posting. The trigger can only be due to a stupid word selection in translation. I can see no English (or American :-)) ) word that could be responsible. Alan G3NYK - Original Message - From: S. Jackson via time-nuts time-nuts at febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts To: sylvainr at netcourrier.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts; time-nuts at febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts Sent: Saturday, October 18, 2014 9:02 PM Subject: Re: [time-nuts] Price of LTE Lite GPSDO vs Trimble Thunderbolt. // Hello Mr Richard, /// // that's a first! While I lived in Germany for almost 2 decades, I am not // sure what other connection the listing could have to Nazi propaganda??! // // If anyone has any suggestions how to reword the listing I would love to // hear them. // // For now, can you use a proxy server to get access to the site? Don't we // just love internet censorship. // // Bye, // Said // // // In a message dated 10/18/2014 12:35:27 Pacific Daylight Time: // // Mr Jackson, // // May I suggest you rewrite the eBay description for the LTE-Lite. As it // stands, it triggers the anti-nazi filters that block some items from // being displayed in France possibly some other countries (at least // Germany and Austria): // Unfortunately, access to this particular item has been blocked due to // legal restrictions in some countries. We are blocking your viewing in // an effort to prevent restricted items from being displayed. // Regrettably, in some cases, we may prevent users from accessing items // that are not within the scope of said restrictions because of // limitations of existing technology. Please accept our apologies for // any inconvenience this may cause, and we hope you may find other items // of interest on eBay. // // Best regards, // // Sylvain RICHARD/ ___ 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] Price of LTE Lite GPSDO vs Trimble Thunderbolt.
The hidden pages are generally because seller specifies they don't ship to those countries. I don't sell outside of US and Canada Mexico (NAFTA) because USG requires me to maintain export documentation for 7 years for anywhere else and like all the other USG export regs it's a felony if you don't have those records. Sorry I'm not a business it's not worth the potential risk. Sent from my iPhone On Oct 18, 2014, at 2:09 PM, Pete Lancashire p...@petelancashire.com wrote: These are the direct links to the items http://www.ebay.com/itm/171504585820 10 MHz http://www.ebay.com/itm/171504588307 19.2 MHz http://www.ebay.com/itm/171504586548 20 MHz you can use this link on any ebay.com item -pete On Sat, Oct 18, 2014 at 1:59 PM, Hans Holzach hans.holz...@gmail.com wrote: living in switzerland, i have encountered that problem several times. ebay blocks pages from certain sellers for reasons i do not know. a good seller from china, just as an example, does not show up when i use firefeox to access ebay. same with said's pages. i recommend using the TorBrowser. it veils your identity and you see all those hidden pages and stores on ebay, including said's lte gpsdo. i don't think it has anything to do with the wording. or nazi-stuff... this direct link may work as well: http://www.ebay.com/sch/i. html?_from=R40_trksid=p2050601.m570.l1313.TR0.TRC0. H0.Xlte+gpsdo_nkw=lte+gpsdo_sacat=0 hans Said I read through the description carefully .I suggest you request a refund from eBay for their use of incompetant computer translation which fails to recognise English technical words and phases, so blocking your paid for posting. The trigger can only be due to a stupid word selection in translation. I can see no English (or American :-)) ) word that could be responsible. Alan G3NYK - Original Message - From: S. Jackson via time-nuts time-nuts at febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts To: sylvainr at netcourrier.com https://www.febo.com/cgi-bin/ mailman/listinfo/time-nuts; time-nuts at febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts Sent: Saturday, October 18, 2014 9:02 PM Subject: Re: [time-nuts] Price of LTE Lite GPSDO vs Trimble Thunderbolt. / Hello Mr Richard, // // that's a first! While I lived in Germany for almost 2 decades, I am not // sure what other connection the listing could have to Nazi propaganda??! // // If anyone has any suggestions how to reword the listing I would love to // hear them. // // For now, can you use a proxy server to get access to the site? Don't we // just love internet censorship. // // Bye, // Said // // // In a message dated 10/18/2014 12:35:27 Pacific Daylight Time: // // Mr Jackson, // // May I suggest you rewrite the eBay description for the LTE-Lite. As it // stands, it triggers the anti-nazi filters that block some items from // being displayed in France possibly some other countries (at least // Germany and Austria): // Unfortunately, access to this particular item has been blocked due to // legal restrictions in some countries. We are blocking your viewing in // an effort to prevent restricted items from being displayed. // Regrettably, in some cases, we may prevent users from accessing items // that are not within the scope of said restrictions because of // limitations of existing technology. Please accept our apologies for // any inconvenience this may cause, and we hope you may find other items // of interest on eBay. // // Best regards, // // Sylvain RICHARD/ ___ 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] Where the 5370's are...
People are always complaining that US test equipment is unobtanium overseas. So far I have shipped out around 30 of the HP5370 extender card kits. It is rather interesting that well over half have gone international: Canada, UK, Netherlands, Denmark, Sweden, Spain, France, Portugal, Germany, Australia, Tasmania, New Zealand, Guam, Jamaica, and a few others. Somehow, the not-so-humble 5370 has spread itself rather far and wide. But then, where else can you get a 30 year old $25,000 device for a couple of hundred bucks that modern equipment has a hard time out performing. Plus, it can now run Linux using John's Beaglebone CPU card... ___ 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 module
Guys, one last email. The board will not fit into the Hammond enclosure without reworking the enclosure or removing the TCXO socket. We initially planned to ship the board without the socket, now all of them will have it. The board was designed to be used without the TCXO/Socket to fit into that enclosure. Caveat: please expect some rework to be necessary when using the suggested Hammond enclosure. bye, Said In a message dated 10/18/2014 12:56:06 Pacific Daylight Time, time-nuts@febo.com writes: Guys, we have been getting a good number of emails with questions that have already been addressed in the user manual or the FAQ, see the below link. We spent a lot of time putting the collateral together, may I please ask that you first look into these two documents to see if your question might already be addressed there? Paul, please search the LTE Lite user manual for Hammond and you will find it there: http://www.jackson-labs.com/index.php/products/lte_lite Thanks, Said _ Do you have a recommended Hammond chassis part number? -- Paul ___ 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] Lightning arrestors for GPSDO antenna
On 10/18/14, 2:05 PM, Bill Hawkins wrote: FWIW, when grounding the metal mast of a boat, three inch wide copper strap is used because it is a better RF conductor. The strap is available in marine supply stores. It's actually more about being convenient to install, and tradition. If you have a 1 square centimeter conductor at 1x1 cm, the inductance is about 1.5 uH/meter, and when it's 10cmx 1mm (4 wide) the inductance is 1.15 uH/meter. That's not a big difference in the voltage due to a transient. What does go down dramatically (at frequencies where the skin effect thickness is small) is the AC resistance, which will be 0.2 for the 10x0.1 (20cm perimeter) relative to the 1x1 bar (4 cm perimeter). Skin depth in copper at 1 MHz is about 0.06mm. so the bar has a effective RF cross-section of 2.4 square mm, for a AC resistance of about 7 milliOhm/meter. However, for lightning, with rise times in the microsecond range (e.g. MHz kind of frequency), the voltage due to inductance is huge (1 uH/meter * 10 kA/microsecond = 10kV/meter) compared to the voltage due to resistance (10kA*7mOhm/m = 70V/meter) Now, if that strap is part of an RF ground for your transmitting antenna, then the lower resistance of the strap is a good thing. Inductance is lossless, but AC resistance sure isn't. ___ 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 module
Said: Your email app note was VERY clear, thanks. You also mentioned somewhere that the synthesizer output of 10 MHz is cleaner than most freq counters, etc., need, so I will probably just use that for the test equipment. I will use the 20 MHz as reference for microwave LOs, and will do the divide by two board so I have a good 10 MHz reference as well. I've already ordered, holding my breath for arrival! Thanks, Jim On 10/18/2014 2:19 PM, S. Jackson via time-nuts wrote: Hi guys, Jim, I ended up doing the appnote in email format, and sending out a description, schematics, PN plot, and photos yesterday, please check your emails. I won't do a formal appnote, sorry no time.. I hope the description of what I wired-up yesterday is good enough for folks to try the same. --- This email is free from viruses and malware because avast! Antivirus protection is active. http://www.avast.com ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] LTE-Lite module
Hi Bill, I think it makes perfect sense. But I have no idea how the units' loop stability would be with the 10811. That kind of testing is on the plate. You would preferably set the OCXO to a nominal tuning voltage of 1.5V using the mechanical adjustment, then let the LTE Lite do the rest. Please note that the LTE board will auto-sense the external ocxo frequency, so any of the boards would work. Please also note that due to the harmonic mixing issues I described earlier the best board to use for that setup would be the 19.2MHz version(!) or to remove the on-board tcxo altogether. Bye, Said Sent From iPhone On Oct 18, 2014, at 15:24, Bill Dailey docdai...@gmail.com wrote: Said, How tough would it be to mate the 10Mhz version up to a really good 10811? I have one that I acquired from Corby some time ago. I was going to spin my own but I wont realistically get to that with everything else I have going on. I was thinking of throwing the LTE-Lite and the 10811 in a box. I woudl then have a stock fury, An enhanced OEM fury (datum-c) and then this gadget with a 10-13 10811. Let me know if this doesnt make sense. I am an amateur. Bill On Sat, Oct 18, 2014 at 5:13 PM, S. Jackson via time-nuts time-nuts@febo.com wrote: Guys, one last email. The board will not fit into the Hammond enclosure without reworking the enclosure or removing the TCXO socket. We initially planned to ship the board without the socket, now all of them will have it. The board was designed to be used without the TCXO/Socket to fit into that enclosure. Caveat: please expect some rework to be necessary when using the suggested Hammond enclosure. bye, Said In a message dated 10/18/2014 12:56:06 Pacific Daylight Time, time-nuts@febo.com writes: Guys, we have been getting a good number of emails with questions that have already been addressed in the user manual or the FAQ, see the below link. We spent a lot of time putting the collateral together, may I please ask that you first look into these two documents to see if your question might already be addressed there? Paul, please search the LTE Lite user manual for Hammond and you will find it there: http://www.jackson-labs.com/index.php/products/lte_lite Thanks, Said _ Do you have a recommended Hammond chassis part number? -- Paul ___ 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. -- Doc Bill Dailey KXØO ___ 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] Lightning arrestors for GPSDO antenna
John Allen wrote: Hello All - There is a 500+ page document on grounding, lightning protection and more - Google for: STANDARDS AND GUIDELINES FOR COMMUNICATION SITES Motorola R56 2005 Regards, John K1AE Great document! Thanks for the link Dave M ___ 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] Inmarsat needs a time-nut
One would *hope* that they can do the same process with an aircraft on a known route and get data that makes sense. My recollection from news reports at the time is that they flew a bunch of calibration flights using other similarly-outfitted 777s from the Malaysian Airlines fleet, including flights on and near the inferred track of MH370. 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] LTE-Lite module
Said, How tough would it be to mate the 10Mhz version up to a really good 10811? I have one that I acquired from Corby some time ago. I was going to spin my own but I wont realistically get to that with everything else I have going on. I was thinking of throwing the LTE-Lite and the 10811 in a box. I woudl then have a stock fury, An enhanced OEM fury (datum-c) and then this gadget with a 10-13 10811. Let me know if this doesnt make sense. I am an amateur. Bill On Sat, Oct 18, 2014 at 5:13 PM, S. Jackson via time-nuts time-nuts@febo.com wrote: Guys, one last email. The board will not fit into the Hammond enclosure without reworking the enclosure or removing the TCXO socket. We initially planned to ship the board without the socket, now all of them will have it. The board was designed to be used without the TCXO/Socket to fit into that enclosure. Caveat: please expect some rework to be necessary when using the suggested Hammond enclosure. bye, Said In a message dated 10/18/2014 12:56:06 Pacific Daylight Time, time-nuts@febo.com writes: Guys, we have been getting a good number of emails with questions that have already been addressed in the user manual or the FAQ, see the below link. We spent a lot of time putting the collateral together, may I please ask that you first look into these two documents to see if your question might already be addressed there? Paul, please search the LTE Lite user manual for Hammond and you will find it there: http://www.jackson-labs.com/index.php/products/lte_lite Thanks, Said _ Do you have a recommended Hammond chassis part number? -- Paul ___ 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. -- Doc Bill Dailey KXØO ___ 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 module
I am sorry, but I can't follow the circuit diagram. It is not clear to me what pins are joined, and what are not. Sometimes you have used a filled circle to indicate lines are joined, and in another case there's a semicircle to indicate that they are not. But on some of the others, I don't know what are supposed to be joined and what are not. Dave On 19 Oct 2014 01:00, S. Jackson via time-nuts time-nuts@febo.com wrote: Dave, et.al., upon popular request I put together a PDF of my email describing how I generated a low-phase-noise 10MHz output from the CMOS 20MHz output of the LTE-Lite GPSDO. Here it is. No guarantees whatsoever guys, and it does take good equipment, a very steady hand, and a lot of experience to put this together and make it work properly. This design can work up to 145MHz according to the 74LVX74 datasheet if powered at 3.3V. bye, Said In a message dated 10/18/2014 14:09:54 Pacific Daylight Time, kc0...@gmail.com writes: Hi, Said. I would be interested in having a copy of your app-note, if that is possible. I'd like to purchase one of the GPSDOs, but will need to wait for amonth or so. Thanks. Cheers, DaveD On 10/18/2014 12:19 PM, S. Jackson via time-nuts wrote: Hi guys, lots of questions, let me try to answer some of these. Bob, David, et. al, thanks for answering some of these already! Dave, as Bob said it depends on your application -- and your time frame. Also, please check the FAQ for an answer on the external TCXO requirement, specifically item 35. in the FAQ on the Ebay website for the product. Jim, I ended up doing the appnote in email format, and sending out a description, schematics, PN plot, and photos yesterday, please check your emails. I won't do a formal appnote, sorry no time.. I hope the description of what I wired-up yesterday is good enough for folks to try the same. Ernie, as mentioned here the price is $185 plus shipping on Ebay for the entire kit. Shipping is calculated by Ebay, and should be a flat-rate of $10 in the continental US Hal, MY BAD!! I should have known better and super-imposed both the original 20MHz and 10MHz plots on the same plot. I will do so shortly. On the table in the plot: the TimePod tries to determine spurs, and display them on the upper right hand of the plot in a table, and with the phase noise being as clean as it is I guess the TimePod software could only find two spurs, one at 0.8 and one at 0.9Hz offset from carrier, which was not even shown in that plot since it starts at 1Hz. Thanks so much for your feedback, lively discussion, and good questions guys. I hope that answers all questions, bye, Said ___ 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 module
Hi The 20 MHz connects only to pin 3. +3V connects to pin 4 , but not pins 2 or 3. Pin 6 hooks only to pin 2 and nothing else. Bob On Oct 18, 2014, at 8:23 PM, Dr. David Kirkby (Kirkby Microwave Ltd) drkir...@kirkbymicrowave.co.uk wrote: I am sorry, but I can't follow the circuit diagram. It is not clear to me what pins are joined, and what are not. Sometimes you have used a filled circle to indicate lines are joined, and in another case there's a semicircle to indicate that they are not. But on some of the others, I don't know what are supposed to be joined and what are not. Dave On 19 Oct 2014 01:00, S. Jackson via time-nuts time-nuts@febo.com wrote: Dave, et.al., upon popular request I put together a PDF of my email describing how I generated a low-phase-noise 10MHz output from the CMOS 20MHz output of the LTE-Lite GPSDO. Here it is. No guarantees whatsoever guys, and it does take good equipment, a very steady hand, and a lot of experience to put this together and make it work properly. This design can work up to 145MHz according to the 74LVX74 datasheet if powered at 3.3V. bye, Said In a message dated 10/18/2014 14:09:54 Pacific Daylight Time, kc0...@gmail.com writes: Hi, Said. I would be interested in having a copy of your app-note, if that is possible. I'd like to purchase one of the GPSDOs, but will need to wait for amonth or so. Thanks. Cheers, DaveD On 10/18/2014 12:19 PM, S. Jackson via time-nuts wrote: Hi guys, lots of questions, let me try to answer some of these. Bob, David, et. al, thanks for answering some of these already! Dave, as Bob said it depends on your application -- and your time frame. Also, please check the FAQ for an answer on the external TCXO requirement, specifically item 35. in the FAQ on the Ebay website for the product. Jim, I ended up doing the appnote in email format, and sending out a description, schematics, PN plot, and photos yesterday, please check your emails. I won't do a formal appnote, sorry no time.. I hope the description of what I wired-up yesterday is good enough for folks to try the same. Ernie, as mentioned here the price is $185 plus shipping on Ebay for the entire kit. Shipping is calculated by Ebay, and should be a flat-rate of $10 in the continental US Hal, MY BAD!! I should have known better and super-imposed both the original 20MHz and 10MHz plots on the same plot. I will do so shortly. On the table in the plot: the TimePod tries to determine spurs, and display them on the upper right hand of the plot in a table, and with the phase noise being as clean as it is I guess the TimePod software could only find two spurs, one at 0.8 and one at 0.9Hz offset from carrier, which was not even shown in that plot since it starts at 1Hz. Thanks so much for your feedback, lively discussion, and good questions guys. I hope that answers all questions, bye, Said ___ 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] Price of LTE Lite GPSDO vs Trimble Thunderbolt.
Hi David - Yes, Thanks! Ebay! In the US it says: Shipping: $10.00 Expedited Shipping | See details Item location: Las Vegas, Nevada, United States Ships to: Worldwide I misread the vague writing. Regards, John K1AE See http://www.ebay.com/itm/LTE-Lite-GPSDO-Evaluation-Kit-with-20MHz-TCXO-/171504586548 Ships World wide for $10 US Regards, John K1AE === Well, no. If I look at that entry from the UK it says: $24.75 USPS Priority Mail International Small Flat Rate Box so it's not US $10 worldwide. 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] LTE-Lite module
This looks pretty interesting: 74G series PO74G74 http://www.ebay.com/itm/330551715157?_trksid=p2060778.m1438.l2649ssPageName=STRK%3AMEBIDX%3AIT#ht_411wt_664 600+ MHz cmos 3.5 volt Tom - Original Message - From: S. Jackson via time-nuts time-nuts@febo.com To: kc0...@gmail.com; time-nuts@febo.com Sent: Saturday, October 18, 2014 5:40 PM Subject: Re: [time-nuts] LTE-Lite module Dave, et.al., upon popular request I put together a PDF of my email describing how I generated a low-phase-noise 10MHz output from the CMOS 20MHz output of the LTE-Lite GPSDO. Here it is. No guarantees whatsoever guys, and it does take good equipment, a very steady hand, and a lot of experience to put this together and make it work properly. This design can work up to 145MHz according to the 74LVX74 datasheet if powered at 3.3V. bye, Said In a message dated 10/18/2014 14:09:54 Pacific Daylight Time, kc0...@gmail.com writes: Hi, Said. I would be interested in having a copy of your app-note, if that is possible. I'd like to purchase one of the GPSDOs, but will need to wait for amonth or so. Thanks. Cheers, DaveD On 10/18/2014 12:19 PM, S. Jackson via time-nuts wrote: Hi guys, lots of questions, let me try to answer some of these. Bob, David, et. al, thanks for answering some of these already! Dave, as Bob said it depends on your application -- and your time frame. Also, please check the FAQ for an answer on the external TCXO requirement, specifically item 35. in the FAQ on the Ebay website for the product. Jim, I ended up doing the appnote in email format, and sending out a description, schematics, PN plot, and photos yesterday, please check your emails. I won't do a formal appnote, sorry no time.. I hope the description of what I wired-up yesterday is good enough for folks to try the same. Ernie, as mentioned here the price is $185 plus shipping on Ebay for the entire kit. Shipping is calculated by Ebay, and should be a flat-rate of $10 in the continental US Hal, MY BAD!! I should have known better and super-imposed both the original 20MHz and 10MHz plots on the same plot. I will do so shortly. On the table in the plot: the TimePod tries to determine spurs, and display them on the upper right hand of the plot in a table, and with the phase noise being as clean as it is I guess the TimePod software could only find two spurs, one at 0.8 and one at 0.9Hz offset from carrier, which was not even shown in that plot since it starts at 1Hz. Thanks so much for your feedback, lively discussion, and good questions guys. I hope that answers all questions, bye, Said ___ 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 module
Thanks for helping out Bob, sometimes I get ahead of myself. Dave, you can also trace the wiring on the photo I had sent of the actual module, its more or less clearly visible under the lupe. Please note that on that module I mounted the IC upside down, with the pins sticking up, and bending the grounded pins down toward the PCB. bye, Said In a message dated 10/18/2014 17:55:36 Pacific Daylight Time, kb...@n1k.org writes: Hi The 20 MHz connects only to pin 3. +3V connects to pin 4 , but not pins 2 or 3. Pin 6 hooks only to pin 2 and nothing else. Bob On Oct 18, 2014, at 8:23 PM, Dr. David Kirkby (Kirkby Microwave Ltd) drkir...@kirkbymicrowave.co.uk wrote: I am sorry, but I can't follow the circuit diagram. It is not clear to me what pins are joined, and what are not. Sometimes you have used a filled circle to indicate lines are joined, and in another case there's a semicircle to indicate that they are not. But on some of the others, I don't know what are supposed to be joined and what are not. Dave On 19 Oct 2014 01:00, S. Jackson via time-nuts time-nuts@febo.com wrote: Dave, et.al., upon popular request I put together a PDF of my email describing how I generated a low-phase-noise 10MHz output from the CMOS 20MHz output of the LTE-Lite GPSDO. Here it is. No guarantees whatsoever guys, and it does take good equipment, a very steady hand, and a lot of experience to put this together and make it work properly. This design can work up to 145MHz according to the 74LVX74 datasheet if powered at 3.3V. bye, Said In a message dated 10/18/2014 14:09:54 Pacific Daylight Time, kc0...@gmail.com writes: Hi, Said. I would be interested in having a copy of your app-note, if that is possible. I'd like to purchase one of the GPSDOs, but will need to wait for amonth or so. Thanks. Cheers, DaveD On 10/18/2014 12:19 PM, S. Jackson via time-nuts wrote: Hi guys, lots of questions, let me try to answer some of these. Bob, David, et. al, thanks for answering some of these already! Dave, as Bob said it depends on your application -- and your time frame. Also, please check the FAQ for an answer on the external TCXO requirement, specifically item 35. in the FAQ on the Ebay website for the product. Jim, I ended up doing the appnote in email format, and sending out a description, schematics, PN plot, and photos yesterday, please check your emails. I won't do a formal appnote, sorry no time.. I hope the description of what I wired-up yesterday is good enough for folks to try the same. Ernie, as mentioned here the price is $185 plus shipping on Ebay for the entire kit. Shipping is calculated by Ebay, and should be a flat-rate of $10 in the continental US Hal, MY BAD!! I should have known better and super-imposed both the original 20MHz and 10MHz plots on the same plot. I will do so shortly. On the table in the plot: the TimePod tries to determine spurs, and display them on the upper right hand of the plot in a table, and with the phase noise being as clean as it is I guess the TimePod software could only find two spurs, one at 0.8 and one at 0.9Hz offset from carrier, which was not even shown in that plot since it starts at 1Hz. Thanks so much for your feedback, lively discussion, and good questions guys. I hope that answers all questions, bye, Said ___ 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 module
The potatochips are quite excelent high speed devices, and by selling them on e-bay, they make it avaible to us who are not able to go through the normal supplier chains. Br. Thomas. 2014-10-19 2:48 GMT+02:00 Tom Miller tmiller11...@verizon.net: This looks pretty interesting: 74G series PO74G74 http://www.ebay.com/itm/330551715157?_trksid=p2060778. m1438.l2649ssPageName=STRK%3AMEBIDX%3AIT#ht_411wt_664 600+ MHz cmos 3.5 volt Tom - Original Message - From: S. Jackson via time-nuts time-nuts@febo.com To: kc0...@gmail.com; time-nuts@febo.com Sent: Saturday, October 18, 2014 5:40 PM Subject: Re: [time-nuts] LTE-Lite module Dave, et.al., upon popular request I put together a PDF of my email describing how I generated a low-phase-noise 10MHz output from the CMOS 20MHz output of the LTE-Lite GPSDO. Here it is. No guarantees whatsoever guys, and it does take good equipment, a very steady hand, and a lot of experience to put this together and make it work properly. This design can work up to 145MHz according to the 74LVX74 datasheet if powered at 3.3V. bye, Said In a message dated 10/18/2014 14:09:54 Pacific Daylight Time, kc0...@gmail.com writes: Hi, Said. I would be interested in having a copy of your app-note, if that is possible. I'd like to purchase one of the GPSDOs, but will need to wait for amonth or so. Thanks. Cheers, DaveD On 10/18/2014 12:19 PM, S. Jackson via time-nuts wrote: Hi guys, lots of questions, let me try to answer some of these. Bob, David, et. al, thanks for answering some of these already! Dave, as Bob said it depends on your application -- and your time frame. Also, please check the FAQ for an answer on the external TCXO requirement, specifically item 35. in the FAQ on the Ebay website for the product. Jim, I ended up doing the appnote in email format, and sending out a description, schematics, PN plot, and photos yesterday, please check your emails. I won't do a formal appnote, sorry no time.. I hope the description of what I wired-up yesterday is good enough for folks to try the same. Ernie, as mentioned here the price is $185 plus shipping on Ebay for the entire kit. Shipping is calculated by Ebay, and should be a flat-rate of $10 in the continental US Hal, MY BAD!! I should have known better and super-imposed both the original 20MHz and 10MHz plots on the same plot. I will do so shortly. On the table in the plot: the TimePod tries to determine spurs, and display them on the upper right hand of the plot in a table, and with the phase noise being as clean as it is I guess the TimePod software could only find two spurs, one at 0.8 and one at 0.9Hz offset from carrier, which was not even shown in that plot since it starts at 1Hz. Thanks so much for your feedback, lively discussion, and good questions guys. I hope that answers all questions, bye, Said ___ 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. -- Please avoid sending me Word or PowerPoint attachments. See http://www.gnu.org/philosophy/no-word-attachments.html PDF is an better alternative and there are always LaTeX! ___ 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 module
Hi Didn’t we just hash through all the Potato Chip stuff earlier this week when Bert brought them up? Bob On Oct 18, 2014, at 9:51 PM, Thomas S. Knutsen la3...@gmail.com wrote: The potatochips are quite excelent high speed devices, and by selling them on e-bay, they make it avaible to us who are not able to go through the normal supplier chains. Br. Thomas. 2014-10-19 2:48 GMT+02:00 Tom Miller tmiller11...@verizon.net: This looks pretty interesting: 74G series PO74G74 http://www.ebay.com/itm/330551715157?_trksid=p2060778. m1438.l2649ssPageName=STRK%3AMEBIDX%3AIT#ht_411wt_664 600+ MHz cmos 3.5 volt Tom - Original Message - From: S. Jackson via time-nuts time-nuts@febo.com To: kc0...@gmail.com; time-nuts@febo.com Sent: Saturday, October 18, 2014 5:40 PM Subject: Re: [time-nuts] LTE-Lite module Dave, et.al., upon popular request I put together a PDF of my email describing how I generated a low-phase-noise 10MHz output from the CMOS 20MHz output of the LTE-Lite GPSDO. Here it is. No guarantees whatsoever guys, and it does take good equipment, a very steady hand, and a lot of experience to put this together and make it work properly. This design can work up to 145MHz according to the 74LVX74 datasheet if powered at 3.3V. bye, Said In a message dated 10/18/2014 14:09:54 Pacific Daylight Time, kc0...@gmail.com writes: Hi, Said. I would be interested in having a copy of your app-note, if that is possible. I'd like to purchase one of the GPSDOs, but will need to wait for amonth or so. Thanks. Cheers, DaveD On 10/18/2014 12:19 PM, S. Jackson via time-nuts wrote: Hi guys, lots of questions, let me try to answer some of these. Bob, David, et. al, thanks for answering some of these already! Dave, as Bob said it depends on your application -- and your time frame. Also, please check the FAQ for an answer on the external TCXO requirement, specifically item 35. in the FAQ on the Ebay website for the product. Jim, I ended up doing the appnote in email format, and sending out a description, schematics, PN plot, and photos yesterday, please check your emails. I won't do a formal appnote, sorry no time.. I hope the description of what I wired-up yesterday is good enough for folks to try the same. Ernie, as mentioned here the price is $185 plus shipping on Ebay for the entire kit. Shipping is calculated by Ebay, and should be a flat-rate of $10 in the continental US Hal, MY BAD!! I should have known better and super-imposed both the original 20MHz and 10MHz plots on the same plot. I will do so shortly. On the table in the plot: the TimePod tries to determine spurs, and display them on the upper right hand of the plot in a table, and with the phase noise being as clean as it is I guess the TimePod software could only find two spurs, one at 0.8 and one at 0.9Hz offset from carrier, which was not even shown in that plot since it starts at 1Hz. Thanks so much for your feedback, lively discussion, and good questions guys. I hope that answers all questions, bye, Said ___ 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. -- Please avoid sending me Word or PowerPoint attachments. See http://www.gnu.org/philosophy/no-word-attachments.html PDF is an better alternative and there are always LaTeX! ___ 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] Where the 5370's are...
On Oct 18, 2014, at 3:48 PM, Mark Sims hol...@hotmail.com wrote: It is rather interesting that well over half have gone international … Agreed. I have shipped processor boards to Canada, UK, Netherlands, Denmark, Sweden, Spain, Germany, Australia, Brazil, Italy and maybe South Africa if their post office strike ever ends. Being a part-time resident of New Zealand also makes me painfully aware of the high costs of international shipping, VAT/GST and generally poor treatment by customs and post offices. It varies a lot though. My shipments from Shenzhen just fly from there through customs in LA (usually less than 24 hours), then proceed to get lost inside DHL for a week or more while they try and decide, again, if New Mexico is really a legitimate US state. ___ 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] Where the 5370's are...
While a student at NMTech in Socorro, NM, longer ago than I care to mention, I was told upon trying to make a purchase on the phone from a firm in New York...we don't accept foreign currency some things don't change much Don On 10/18/2014 9:18 PM, John Seamons wrote: while they try and decide, again, if New Mexico is really a legitimate US state. ___ 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] Where the 5370's are...
if New Mexico is really a legitimate US state. I dunno, I've been there. Was exposed to bubonic plague. And a friend caught some wonderful blue corn tortilla parasite. And the interstate highway was two narrow strips of asphalt (one for each pair of wheels) separated by a few feet of grass. And the phone numbers were four digits long. ___ 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] Where the 5370's are...
yep. Actually, my wife worked in Socorro on the second-to-last manual telephone exchange in the US. Our phone number was 49J. If I remember right, it was an 8-party line. No secrets! Don On 10/18/2014 10:24 PM, Mark Sims wrote: if New Mexico is really a legitimate US state. I dunno, I've been there. Was exposed to bubonic plague. And a friend caught some wonderful blue corn tortilla parasite. And the interstate highway was two narrow strips of asphalt (one for each pair of wheels) separated by a few feet of grass. And the phone numbers were four digits long. ___ 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] Where the 5370's are...
Was there couple of weeks back to visit Los Alamos and the VLA- among other things- sure aint like that now. Gee you guys must be old.! BTW- the Black Hole is dead- no visible stock looking in windows and all closed up. DaveB, Christchurch, NZ - Original Message - From: Mark Sims hol...@hotmail.com To: time-nuts@febo.com Sent: Sunday, October 19, 2014 5:24 PM Subject: [time-nuts] Where the 5370's are... if New Mexico is really a legitimate US state. I dunno, I've been there. Was exposed to bubonic plague. And a friend caught some wonderful blue corn tortilla parasite. And the interstate highway was two narrow strips of asphalt (one for each pair of wheels) separated by a few feet of grass. And the phone numbers were four digits long. ___ 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.
