[time-nuts] ANN: UK Ofcom Update: GPS Jamming Notice, 18 and 22 March 2013
Folks, I have received the following: _ NOTIFICATION OF GPS JAMMING EXERCISE STANFORD TRAINING AREA, EAST ANGLIA, March 2013 Dates: Between 18 and 22 March 2013. Times: 0900 -1700 GMT. Location of MULTIPLE jammers: Land based within 5km of N52° 29.0' E000° 45.0'. Frequency: A 24 MHz band centred around 1575.42MHz (GPS L1). Total Power: Up to 10 Watts EIRP. Jammers: Directional jammers radiating CW, BPSK and noise modulation. _ 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] Thunderbolt oven / non-stable operating temperature
tvb wrote: do either of you have actual tempco numbers? I checked my notes and found that I did not record any free-running tempco values. My observations were based on the scale factors I had to use to get the temperature and DAC graphs in Lady Heather to overlay each other. I initially noticed it because there was a very pronounced tracking of the two graphs for one Tbolt and for the other two there was not (the temperature-compensating component of the DAC voltage is mostly lost in the noise). I had checked the actual EFC sensitivity of each oscillator in the vicinity of the operating point, so all relevant variables were more or less controlled. My impression is that the better ones are comparable to a single-oven 10811, maybe even a bit better. LH typically reports tempcos of 1e-12/C to 1e-11/C. My worse unit (and, from what I can infer from LH plots posted to the list and on-line, it appears many others as well) typically reports a tempco of 1e-10/C to 1e-9/C. Of course, the LH numbers are all to be taken with some caution since LH does not have any a priori means to separate tempco and drift. 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] Thunderbolt oven / non-stable operating temperature
Hi LH can get a bit confused about OCXO tempo. It's not really the software's fault, as you point out - the data just isn't there. Bob On Dec 14, 2012, at 5:36 AM, Charles P. Steinmetz charles_steinm...@lavabit.com wrote: tvb wrote: do either of you have actual tempco numbers? I checked my notes and found that I did not record any free-running tempco values. My observations were based on the scale factors I had to use to get the temperature and DAC graphs in Lady Heather to overlay each other. I initially noticed it because there was a very pronounced tracking of the two graphs for one Tbolt and for the other two there was not (the temperature-compensating component of the DAC voltage is mostly lost in the noise). I had checked the actual EFC sensitivity of each oscillator in the vicinity of the operating point, so all relevant variables were more or less controlled. My impression is that the better ones are comparable to a single-oven 10811, maybe even a bit better. LH typically reports tempcos of 1e-12/C to 1e-11/C. My worse unit (and, from what I can infer from LH plots posted to the list and on-line, it appears many others as well) typically reports a tempco of 1e-10/C to 1e-9/C. Of course, the LH numbers are all to be taken with some caution since LH does not have any a priori means to separate tempco and drift. 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] B-1B bomber time reference
Hi Ummm…… e….. wasn't the ARC-164 the original HAVE QUICK radio? They certainly came out in both HAVE QUICK I and HAVE QUICK II versions. Yes, that was 30 years ago…. Bob On Dec 14, 2012, at 1:24 AM, Peter Bell bell.pe...@gmail.com wrote: One of the very first time related projects I was involved in was for synchronizing radios - this was when they were retrofitting HAVE QUICK to the AN/ARC-164 and wanted a cheap, portable source of TOD data - the GPS was a 2-Channel Magnavox unit (C/A code only) and they also did the firmware modifications to generate the right data format (STANAG 4246?) - so basically all that was left was putting them into a box with battery backup. Wow, that was more than 20 years ago - I guess I'm getting old... ___ time-nuts mailing 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] B-1B bomber time reference
Several years ago I bought a very nice 24U EMC screend cabinet at auction. It had an Odetics SatSync GPSDo with a rubidium reference, dual redundant power supplies, a logic box and an AN/ARC164 UHF transceiverin a 19 rack chassis. It was a shipborne havequick timing reference. I still have the SatSync and got 5 times what I paid for the whole thing for the ARC164 :-) Robert G8RPI. From: Peter Bell bell.pe...@gmail.com To: li...@lazygranch.com; Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Friday, 14 December 2012, 6:24 Subject: Re: [time-nuts] B-1B bomber time reference One of the very first time related projects I was involved in was for synchronizing radios - this was when they were retrofitting HAVE QUICK to the AN/ARC-164 and wanted a cheap, portable source of TOD data - the GPS was a 2-Channel Magnavox unit (C/A code only) and they also did the firmware modifications to generate the right data format (STANAG 4246?) - so basically all that was left was putting them into a box with battery backup. Wow, that was more than 20 years ago - I guess I'm getting old... ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Thunderbolt oven / non-stable operating temperature
I think what I'll do is collect some data on a batch of TBolts that I have soaking here. It seems to me there's enough information that, over time, the tempco can be accurately determined. I mean, when you see LH plots with glaring diurnal patterns in both temp and DAC it's easy to roughly calculate the correlation by eye. Alternately, when the TBolt is in disciplining-disabled mode, the tempco can be inferred from temp and quadratic PPS offset residuals (EFC gain is not a factor in this case). Or for greater precision, a simple match of variations in ambient temp and externally measured frequency would do the job. I use different software to talk with my TBolts anyway, logging all communication in its native TSIP binary. I'll modify or write an automated tool to take the guesswork out of it. /tvb - Original Message - From: Charles P. Steinmetz charles_steinm...@lavabit.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Friday, December 14, 2012 2:36 AM Subject: Re: [time-nuts] Thunderbolt oven / non-stable operating temperature tvb wrote: do either of you have actual tempco numbers? I checked my notes and found that I did not record any free-running tempco values. My observations were based on the scale factors I had to use to get the temperature and DAC graphs in Lady Heather to overlay each other. I initially noticed it because there was a very pronounced tracking of the two graphs for one Tbolt and for the other two there was not (the temperature-compensating component of the DAC voltage is mostly lost in the noise). I had checked the actual EFC sensitivity of each oscillator in the vicinity of the operating point, so all relevant variables were more or less controlled. My impression is that the better ones are comparable to a single-oven 10811, maybe even a bit better. LH typically reports tempcos of 1e-12/C to 1e-11/C. My worse unit (and, from what I can infer from LH plots posted to the list and on-line, it appears many others as well) typically reports a tempco of 1e-10/C to 1e-9/C. Of course, the LH numbers are all to be taken with some caution since LH does not have any a priori means to separate tempco and drift. 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] Synergy SSR-6TR
David Unfortunately as easy as that is to do that would remove me from the buy 1 list. Sorry. You need a timenut that doesn't want one. :-) Paul WB8TSL On Fri, Dec 14, 2012 at 1:52 AM, David J Taylor david-tay...@blueyonder.co.uk wrote: From: Don Latham Sent: Thursday, December 13, 2012 9:26 PM To: time nuts Subject: [time-nuts] Synergy SSR-6TR The Synergy SSR-T6R timing GPS is indeed available for $35 on a one off basis. Shipping is about $10. The very best way to order is from: Gina Aspeytia [] However, the cheapest shipping they could manage to the UK was around $60, making it not such good value for money. Another parcel sent to me by a Time-Nuts member was less than $10 postage, so I did ask whether they might just walk down to their local post office and send a packet that way, but they only deal with the main-stream couriers. I had almost considered asking a Time-Nuts member to order one for me, as it's a nice unit. 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-nutshttps://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] Synergy SSR-6TR
David Unfortunately as easy as that is to do that would remove me from the buy 1 list. Sorry. You need a timenut that doesn't want one. :-) Paul WB8TSL == Yes, I appreciate that, Paul. Why I said almost considered. But if there is someone willing, I would be grateful, as might others on this side of the pond. 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.
Re: [time-nuts] Synergy SSR-6TR
Hi David, I am interested about this GPS module but to get here in Hungary it is also around 60-80 USD... Rgds Ernie. -Original Message- From: David J Taylor david-tay...@blueyonder.co.uk To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Fri, Dec 14, 2012 3:28 pm Subject: Re: [time-nuts] Synergy SSR-6TR David nfortunately as easy as that is to do that would remove me from the buy 1 ist. orry. ou need a timenut that doesn't want one. :-) aul B8TSL == Yes, I appreciate that, Paul. Why I said almost considered. But if here is someone willing, I would be grateful, as might others on this side f the pond. 73, avid GM8ARV - atSignal Software - Quality software written to your requirements eb: http://www.satsignal.eu mail: david-tay...@blueyonder.co.uk __ ime-nuts mailing list -- time-nuts@febo.com o unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts nd 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] B-1B bomber time reference
It was certainly one of the very first radios with it - but there was also a non HQ version (the most obvious sign was that the synthesizer slice just had Synth rather than Synth/ECCM on it. The RAF in the UK had a bunch of them and wanted to modify them to HQ spec for interoperability - the reason for the special timing box was that the one the USAF were using was based on a military spec GPS receiver that was a much bigger export problem than the HQ radios were. I also have a vague memory that although the actual GPS would work in a degraded mode if it didn't have current key data the TOD output just turned off because it could no longer decode the corrections for SA and the designers had decided that possibly wrong was worse than nothing at all. Thinking about this stuff makes me feel old (looks at his phone with a 40 channel parallel tracking GPS/GLONASS receiver in it). On Fri, Dec 14, 2012 at 7:30 PM, Bob Camp li...@rtty.us wrote: Hi Ummm…… e….. wasn't the ARC-164 the original HAVE QUICK radio? They certainly came out in both HAVE QUICK I and HAVE QUICK II versions. Yes, that was 30 years ago…. Bob On Dec 14, 2012, at 1:24 AM, Peter Bell bell.pe...@gmail.com wrote: One of the very first time related projects I was involved in was for synchronizing radios - this was when they were retrofitting HAVE QUICK to the AN/ARC-164 and wanted a cheap, portable source of TOD data - the GPS was a 2-Channel Magnavox unit (C/A code only) and they also did the firmware modifications to generate the right data format (STANAG 4246?) - so basically all that was left was putting them into a box with battery backup. Wow, that was more than 20 years ago - I guess I'm getting old... ___ time-nuts mailing 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] B-1B bomber time reference
Hi The ARC-164 most certainly existed long before HAVE QUICK came along. My only point was that HAVE QUICK didn't exist before the ARC-164 got it. Bob On Dec 14, 2012, at 9:46 AM, Peter Bell bell.pe...@gmail.com wrote: It was certainly one of the very first radios with it - but there was also a non HQ version (the most obvious sign was that the synthesizer slice just had Synth rather than Synth/ECCM on it. The RAF in the UK had a bunch of them and wanted to modify them to HQ spec for interoperability - the reason for the special timing box was that the one the USAF were using was based on a military spec GPS receiver that was a much bigger export problem than the HQ radios were. I also have a vague memory that although the actual GPS would work in a degraded mode if it didn't have current key data the TOD output just turned off because it could no longer decode the corrections for SA and the designers had decided that possibly wrong was worse than nothing at all. Thinking about this stuff makes me feel old (looks at his phone with a 40 channel parallel tracking GPS/GLONASS receiver in it). On Fri, Dec 14, 2012 at 7:30 PM, Bob Camp li...@rtty.us wrote: Hi Ummm…… e….. wasn't the ARC-164 the original HAVE QUICK radio? They certainly came out in both HAVE QUICK I and HAVE QUICK II versions. Yes, that was 30 years ago…. Bob On Dec 14, 2012, at 1:24 AM, Peter Bell bell.pe...@gmail.com wrote: One of the very first time related projects I was involved in was for synchronizing radios - this was when they were retrofitting HAVE QUICK to the AN/ARC-164 and wanted a cheap, portable source of TOD data - the GPS was a 2-Channel Magnavox unit (C/A code only) and they also did the firmware modifications to generate the right data format (STANAG 4246?) - so basically all that was left was putting them into a box with battery backup. Wow, that was more than 20 years ago - I guess I'm getting old... ___ time-nuts mailing 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] Synergy SSR-6TR
Maybe some one with good Synergy connections can convince them that an overseas time-nut can buy and pay but use an US time-nut for shipping that in turn will forward it. I understand the cost involved for a Synergy because of the paperwork, but I ship regularly oversees with USPS as some of you can attest to. Never had a problem or a loss. Bert Kehren Miami In a message dated 12/14/2012 9:05:30 A.M. Eastern Standard Time, paulsw...@gmail.com writes: David Unfortunately as easy as that is to do that would remove me from the buy 1 list. Sorry. You need a timenut that doesn't want one. :-) Paul WB8TSL On Fri, Dec 14, 2012 at 1:52 AM, David J Taylor david-tay...@blueyonder.co.uk wrote: From: Don Latham Sent: Thursday, December 13, 2012 9:26 PM To: time nuts Subject: [time-nuts] Synergy SSR-6TR The Synergy SSR-T6R timing GPS is indeed available for $35 on a one off basis. Shipping is about $10. The very best way to order is from: Gina Aspeytia [] However, the cheapest shipping they could manage to the UK was around $60, making it not such good value for money. Another parcel sent to me by a Time-Nuts member was less than $10 postage, so I did ask whether they might just walk down to their local post office and send a packet that way, but they only deal with the main-stream couriers. I had almost considered asking a Time-Nuts member to order one for me, as it's a nice unit. 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-nutshttps://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] Synergy SSR-6TR
David, Any chance you can buy it in your name and have it shipped somewhere in the States? That person then can forward it without losing their chance to get one as well. I have no experience shipping overseas but will second Bert's suggestion plus volunteer myself to do it, if need be. How can you trust me? Well, if you are not happy let our Febo host John Ackermann know and he'll beat me up at the next Dayton Hamvention Bob LaJeunesse From: David J Taylor david-tay...@blueyonder.co.uk To: time nuts time-nuts@febo.com Sent: Fri, December 14, 2012 1:52:50 AM Subject: Re: [time-nuts] Synergy SSR-6TR From: Don Latham Sent: Thursday, December 13, 2012 9:26 PM To: time nuts Subject: [time-nuts] Synergy SSR-6TR The Synergy SSR-T6R timing GPS is indeed available for $35 on a one off basis. Shipping is about $10. The very best way to order is from: Gina Aspeytia [] However, the cheapest shipping they could manage to the UK was around $60, making it not such good value for money. Another parcel sent to me by a Time-Nuts member was less than $10 postage, so I did ask whether they might just walk down to their local post office and send a packet that way, but they only deal with the main-stream couriers. I had almost considered asking a Time-Nuts member to order one for me, as it's a nice unit. 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. ___ time-nuts mailing 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] Synergy SSR-6TR
David, Any chance you can buy it in your name and have it shipped somewhere in the States? That person then can forward it without losing their chance to get one as well. I have no experience shipping overseas but will second Bert's suggestion plus volunteer myself to do it, if need be. How can you trust me? Well, if you are not happy let our Febo host John Ackermann know and he'll beat me up at the next Dayton Hamvention Bob LaJeunesse = Bob, Many thanks for your offer - that's mist kind of you. As it happens, I've just accepted an offer from someone else who will just buy for himself and reship. As Synergy are very kind in making the offer, I didn't want to complicate things for them by having a different purchase and shipping address. I've never been to a Dayton Hamvention but it sounds like I would a few folks a beer if I did! 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.
[time-nuts] FS: HP 48gx with cable books and docs
Hi all! My 48gx is up for sale. Included are the following items db-9 to calculator cable soft case with writing on it in marker. user's guide calculus on the hp 48gx calculus and precalculus on the 48gx An easy course in programming the 48gx The definitive user's guide to the 48g/gx 230 shipped conus. Or make me an offer. 73 de Norm n3ykf ___ time-nuts mailing 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] FS: HP 48gx with cable books and docs
Norm, No cross-posting on this list, please. Your email has nothing to do with time/frequency. /tvb (iPhone4) On Dec 14, 2012, at 10:25 AM, Lizeth Norman normanliz...@gmail.com wrote: Hi all! My 48gx is up for sale. Included are the following items db-9 to calculator cable soft case with writing on it in marker. user's guide calculus on the hp 48gx calculus and precalculus on the 48gx An easy course in programming the 48gx The definitive user's guide to the 48g/gx 230 shipped conus. Or make me an offer. 73 de Norm n3ykf ___ time-nuts mailing 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] Synergy SSR-6TR
Sorry, this is off-topic: Wondering I'm if anyone else had part of this particular conversation / thread (Synergy SSR-6TR) sent to their spam folder or otherwise filtered? From what I suspect, it was just a false-positive, as the conversation didn't appear to be spam, wondering if the word synergy mixed with one or more unexpected grammar quirks (shorthand, time frequency related vocabulary or otherwise) could've been the cause. Part of the reason for my posting this message is to help train gmail's spam-filter not to flag this thread / mailing list (for both myself and any other gmail users) ___ time-nuts mailing 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] FS: HP 48gx with cable books and docs
Tom, Already got yelled at by jra! Norm no feelings hurt. I am truly sorry! On Fri, Dec 14, 2012 at 1:35 PM, Tom Van Baak (lab) t...@leapsecond.com wrote: Norm, No cross-posting on this list, please. Your email has nothing to do with time/frequency. /tvb (iPhone4) On Dec 14, 2012, at 10:25 AM, Lizeth Norman normanliz...@gmail.com wrote: Hi all! My 48gx is up for sale. Included are the following items db-9 to calculator cable soft case with writing on it in marker. user's guide calculus on the hp 48gx calculus and precalculus on the 48gx An easy course in programming the 48gx The definitive user's guide to the 48g/gx 230 shipped conus. Or make me an offer. 73 de Norm n3ykf ___ time-nuts mailing 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] Thunderbolt oven / non-stable operating temperature
On 12/11/2012 10:33 PM, Charles P. Steinmetz wrote: All three have Trimble 37265 OCXOs (( sorry to single out that one line )) Just a curiosity. Is there any way to check that via software? Did you just physically look under the cover, or how did you figure out which type of oscillator your thunderbolt has? Thanks, Sarah ___ time-nuts mailing 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] Synergy SSR-6TR
I use gmail and no problem from what I can see. On Fri, Dec 14, 2012 at 1:38 PM, Sarah White kuze...@gmail.com wrote: Sorry, this is off-topic: Wondering I'm if anyone else had part of this particular conversation / thread (Synergy SSR-6TR) sent to their spam folder or otherwise filtered? From what I suspect, it was just a false-positive, as the conversation didn't appear to be spam, wondering if the word synergy mixed with one or more unexpected grammar quirks (shorthand, time frequency related vocabulary or otherwise) could've been the cause. Part of the reason for my posting this message is to help train gmail's spam-filter not to flag this thread / mailing list (for both myself and any other gmail users) ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Thunderbolt oven / non-stable operating temperature
Hi The OCXO is a dumb version. It does not talk to the TBolt. There's no way to check it in software. There are a few examples out there that have late model stickers on the outside and earlier parts on the inside. There's pretty much no way to know what you have without opening up the box. When you open the box, be careful not to loose the hardware that goes on the F connector…. Bob On Dec 14, 2012, at 1:42 PM, Sarah White kuze...@gmail.com wrote: On 12/11/2012 10:33 PM, Charles P. Steinmetz wrote: All three have Trimble 37265 OCXOs (( sorry to single out that one line )) Just a curiosity. Is there any way to check that via software? Did you just physically look under the cover, or how did you figure out which type of oscillator your thunderbolt has? Thanks, Sarah ___ time-nuts mailing 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] Synergy SSR-6TR
gmail did the same for me Sahra but it is not systematic. This mail from you was classified ok, but Bert Kehren's got flagged. Le 14 déc. 2012 à 19:38, Sarah White a écrit : Sorry, this is off-topic: Wondering I'm if anyone else had part of this particular conversation / thread (Synergy SSR-6TR) sent to their spam folder or otherwise filtered? From what I suspect, it was just a false-positive, as the conversation didn't appear to be spam, wondering if the word synergy mixed with one or more unexpected grammar quirks (shorthand, time frequency related vocabulary or otherwise) could've been the cause. Part of the reason for my posting this message is to help train gmail's spam-filter not to flag this thread / mailing list (for both myself and any other gmail users) ___ time-nuts mailing 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] Synergy SSR-6TR
Hi Obviously Google is out to get Bert…. :) Bob On Dec 14, 2012, at 2:07 PM, mike cook mc235...@gmail.com wrote: gmail did the same for me Sahra but it is not systematic. This mail from you was classified ok, but Bert Kehren's got flagged. Le 14 déc. 2012 à 19:38, Sarah White a écrit : Sorry, this is off-topic: Wondering I'm if anyone else had part of this particular conversation / thread (Synergy SSR-6TR) sent to their spam folder or otherwise filtered? From what I suspect, it was just a false-positive, as the conversation didn't appear to be spam, wondering if the word synergy mixed with one or more unexpected grammar quirks (shorthand, time frequency related vocabulary or otherwise) could've been the cause. Part of the reason for my posting this message is to help train gmail's spam-filter not to flag this thread / mailing list (for both myself and any other gmail users) ___ time-nuts mailing 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] Thunderbolt oven / non-stable operating temperature
Sarah wrote: All three have Trimble 37265 OCXOs Just a curiosity. Is there any way to check that via software? Did you just physically look under the cover, or how did you figure out which type of oscillator your thunderbolt has? You need to open it up. There is a sticker on the OXCO can: Emacs! Best regards, Charles inline: 15249ce9.jpg___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Thunderbolt oven / non-stable operating temperature
tvb wrote: the tempco can be inferred from temp and quadratic PPS offset residuals (EFC gain is not a factor in this case) It would be interesting (to me, at least) to know the spread of EFC gains from a reasonable population of Tbolts. 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] Thunderbolt oven / non-stable operating temperature
Hi The real answer to that is going to be a that depends kind of thing. The population of units in the basement are all within 20% of each other as measured by LH's auto tune process. Bob On Dec 14, 2012, at 2:51 PM, Charles P. Steinmetz charles_steinm...@lavabit.com wrote: tvb wrote: the tempco can be inferred from temp and quadratic PPS offset residuals (EFC gain is not a factor in this case) It would be interesting (to me, at least) to know the spread of EFC gains from a reasonable population of Tbolts. 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] RaspberryPi and RADclock
I suspect my question became lost in the thread. Can the Rasberry with RADclock be used as a NTP server? Thanks Paul WB8TSL On Thu, Dec 13, 2012 at 8:17 AM, Peter Bell bell.pe...@gmail.com wrote: I used to have some ancient microwave stuff that was marked in kMc/s rather than GHz. On Thu, Dec 13, 2012 at 6:55 PM, Bob Camp li...@rtty.us wrote: Hi Shouldn't mus be mili-micro seconds? :) If you go back far enough you will indeed find gear calibrated in mu (mili micro) and uu (micro micro) seconds. I've been doing this for quite a while and that was well before my time…. Bob On Dec 12, 2012, at 11:33 PM, Matt Davis mattdav...@gmail.com wrote: Hi Magnus, From: Magnus Danielson mag...@rubidium.dyndns.org Matt, On 12/12/2012 10:23 PM, Matt Davis wrote: Hey time-legumes, I figured a few of you all might be interested in some of the work that the team and I have been doing. We recently acquired a couple of RaspberryPis, and out of curiosity, we wanted to see how well our RADclock software performs on this small platform. Anyways, our dive into the micro-platform world is on our blog: http://synclab.org/?post=blog/2012/11/radclock-raspberry-stability-nic-noise.html Interesting. What is mus in those graphs? Microseconds? I would expect us in that case, milimicroseconds looks wrong. You are correct, the 'mus' refers to microseconds. -Matt ___ time-nuts mailing 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] RaspberryPi and RADclock
Le 14 déc. 2012 à 21:12, paul swed a écrit : I suspect my question became lost in the thread. Can the Rasberry with RADclock be used as a NTP server? Looking at the doc on the synclab.org site it appears that it can in the sense that you can configure clients with radclock running to send ntp requests to another server with radclock daemon running the daemon has a server thread built in. It is independent of but can coexist with ntpd. There does not appear to be an ntp clock driver type. Thanks Paul WB8TSL On Thu, Dec 13, 2012 at 8:17 AM, Peter Bell bell.pe...@gmail.com wrote: I used to have some ancient microwave stuff that was marked in kMc/s rather than GHz. On Thu, Dec 13, 2012 at 6:55 PM, Bob Camp li...@rtty.us wrote: Hi Shouldn't mus be mili-micro seconds? :) If you go back far enough you will indeed find gear calibrated in mu (mili micro) and uu (micro micro) seconds. I've been doing this for quite a while and that was well before my time…. Bob On Dec 12, 2012, at 11:33 PM, Matt Davis mattdav...@gmail.com wrote: Hi Magnus, From: Magnus Danielson mag...@rubidium.dyndns.org Matt, On 12/12/2012 10:23 PM, Matt Davis wrote: Hey time-legumes, I figured a few of you all might be interested in some of the work that the team and I have been doing. We recently acquired a couple of RaspberryPis, and out of curiosity, we wanted to see how well our RADclock software performs on this small platform. Anyways, our dive into the micro-platform world is on our blog: http://synclab.org/?post=blog/2012/11/radclock-raspberry-stability-nic-noise.html Interesting. What is mus in those graphs? Microseconds? I would expect us in that case, milimicroseconds looks wrong. You are correct, the 'mus' refers to microseconds. -Matt ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] RaspberryPi and RADclock
Thanks Mike On Fri, Dec 14, 2012 at 4:45 PM, mike cook mc235...@gmail.com wrote: Le 14 déc. 2012 à 21:12, paul swed a écrit : I suspect my question became lost in the thread. Can the Rasberry with RADclock be used as a NTP server? Looking at the doc on the synclab.org site it appears that it can in the sense that you can configure clients with radclock running to send ntp requests to another server with radclock daemon running the daemon has a server thread built in. It is independent of but can coexist with ntpd. There does not appear to be an ntp clock driver type. Thanks Paul WB8TSL On Thu, Dec 13, 2012 at 8:17 AM, Peter Bell bell.pe...@gmail.com wrote: I used to have some ancient microwave stuff that was marked in kMc/s rather than GHz. On Thu, Dec 13, 2012 at 6:55 PM, Bob Camp li...@rtty.us wrote: Hi Shouldn't mus be mili-micro seconds? :) If you go back far enough you will indeed find gear calibrated in mu (mili micro) and uu (micro micro) seconds. I've been doing this for quite a while and that was well before my time…. Bob On Dec 12, 2012, at 11:33 PM, Matt Davis mattdav...@gmail.com wrote: Hi Magnus, From: Magnus Danielson mag...@rubidium.dyndns.org Matt, On 12/12/2012 10:23 PM, Matt Davis wrote: Hey time-legumes, I figured a few of you all might be interested in some of the work that the team and I have been doing. We recently acquired a couple of RaspberryPis, and out of curiosity, we wanted to see how well our RADclock software performs on this small platform. Anyways, our dive into the micro-platform world is on our blog: http://synclab.org/?post=blog/2012/11/radclock-raspberry-stability-nic-noise.html Interesting. What is mus in those graphs? Microseconds? I would expect us in that case, milimicroseconds looks wrong. You are correct, the 'mus' refers to microseconds. -Matt ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] B-1B bomber time reference
Ah, OK - I didn't realize that it was actually the first HQ radio - all I knew was that it was the first one that I saw... On Fri, Dec 14, 2012 at 10:49 PM, Bob Camp li...@rtty.us wrote: Hi The ARC-164 most certainly existed long before HAVE QUICK came along. My only point was that HAVE QUICK didn't exist before the ARC-164 got it. Bob On Dec 14, 2012, at 9:46 AM, Peter Bell bell.pe...@gmail.com wrote: It was certainly one of the very first radios with it - but there was also a non HQ version (the most obvious sign was that the synthesizer slice just had Synth rather than Synth/ECCM on it. The RAF in the UK had a bunch of them and wanted to modify them to HQ spec for interoperability - the reason for the special timing box was that the one the USAF were using was based on a military spec GPS receiver that was a much bigger export problem than the HQ radios were. I also have a vague memory that although the actual GPS would work in a degraded mode if it didn't have current key data the TOD output just turned off because it could no longer decode the corrections for SA and the designers had decided that possibly wrong was worse than nothing at all. Thinking about this stuff makes me feel old (looks at his phone with a 40 channel parallel tracking GPS/GLONASS receiver in it). On Fri, Dec 14, 2012 at 7:30 PM, Bob Camp li...@rtty.us wrote: Hi Ummm…… e….. wasn't the ARC-164 the original HAVE QUICK radio? They certainly came out in both HAVE QUICK I and HAVE QUICK II versions. Yes, that was 30 years ago…. Bob On Dec 14, 2012, at 1:24 AM, Peter Bell bell.pe...@gmail.com wrote: One of the very first time related projects I was involved in was for synchronizing radios - this was when they were retrofitting HAVE QUICK to the AN/ARC-164 and wanted a cheap, portable source of TOD data - the GPS was a 2-Channel Magnavox unit (C/A code only) and they also did the firmware modifications to generate the right data format (STANAG 4246?) - so basically all that was left was putting them into a box with battery backup. Wow, that was more than 20 years ago - I guess I'm getting old... ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] RaspberryPi and RADclock
From: paul swed paulsw...@gmail.com I suspect my question became lost in the thread. Can the Rasberry with RADclock be used as a NTP server? Thanks Paul WB8TSL Hi Paul, RADclock does have a mode where it can speak NTP as a server. We have not yet tested this mode on the PI where it was acting as a server. Our previous test, on the Nov 8th blog entry, was using the RADclock as a client, receiving NTP data from our SyncServer NTP box. -Matt ___ time-nuts mailing 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] RaspberryPi and RADclock
Thanks. I really like the idea that a Rassberry Pi could be a time server. Maybe enough to get me going. Thanks On Fri, Dec 14, 2012 at 9:03 PM, Matt Davis mattdav...@gmail.com wrote: From: paul swed paulsw...@gmail.com I suspect my question became lost in the thread. Can the Rasberry with RADclock be used as a NTP server? Thanks Paul WB8TSL Hi Paul, RADclock does have a mode where it can speak NTP as a server. We have not yet tested this mode on the PI where it was acting as a server. Our previous test, on the Nov 8th blog entry, was using the RADclock as a client, receiving NTP data from our SyncServer NTP box. -Matt ___ time-nuts mailing 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] RaspberryPi and RADclock
Hi The question is going to be - how accurate is it? Bob On Dec 14, 2012, at 9:51 PM, paul swed paulsw...@gmail.com wrote: Thanks. I really like the idea that a Rassberry Pi could be a time server. Maybe enough to get me going. Thanks On Fri, Dec 14, 2012 at 9:03 PM, Matt Davis mattdav...@gmail.com wrote: From: paul swed paulsw...@gmail.com I suspect my question became lost in the thread. Can the Rasberry with RADclock be used as a NTP server? Thanks Paul WB8TSL Hi Paul, RADclock does have a mode where it can speak NTP as a server. We have not yet tested this mode on the PI where it was acting as a server. Our previous test, on the Nov 8th blog entry, was using the RADclock as a client, receiving NTP data from our SyncServer NTP box. -Matt ___ time-nuts mailing 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] Comparing PPS from 2 GPS units
Hi Tom, but they could have achieved the same exact result by using scientific notation such as: 2.3E-010 or: 2.30E-010 or: 23E-011 to note the higher internal resolution in the later case. I realize that one can easily parse these raw outputs, if one can write python or C etc quickly, but I always find myself doing search and replace: '* u' with '0E-06 in Word etc.. Also I don't happen to have a 1us long and accurate delay line, and I have to measure two pulses very close to each other, so I have no real choice in the matter at this time. The jitter can be up to +/-1us, so I need that 1us delay to keep the values positive. It would be good if the programmers would have added options to select the output format, and how to count time intervals close to zero when going negative. This should have been very easy to add in the counter's software. Maybe there is a Windows executable out there that can parse raw 53132A counter log files, recognize what the data is, and turn them into proper scientific notation as well as handling the 0.999,999,999 second issue, that can then be directly read by programs such as Excel, Plotter, etc? Time-Nuts, anyone willing to write this for the benefit of all? bye, Said In a message dated 12/13/2012 22:55:42 Pacific Standard Time, t...@leapsecond.com writes: Absolutely horrible to parse, these guys should have heard of scientific notation. Not sure who programmed that unit, or if there is a firmware upgrade that gives proper numbers. They are more proper than you think. Do you remember one of the first lessons in high-school science class: scientific measurements have both value and precision. Thus 2.3 is not the same as 2.30 which is not the same as 2.300. Precision is important. When the 53132A adds * it conveys to the user that precision is missing. /tvb ___ time-nuts mailing 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] Comparing PPS from 2 GPS units
saidj...@aol.com said: Time-Nuts, anyone willing to write this for the benefit of all? Does python run on Windows? If so, give me samples of input data and what you want as output. -- These are my opinions. I hate spam. ___ time-nuts mailing 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] Comparing PPS from 2 GPS units
Yes it does. Sent from my iPad On Dec 14, 2012, at 10:47 PM, Hal Murray hmur...@megapathdsl.net wrote: saidj...@aol.com said: Time-Nuts, anyone willing to write this for the benefit of all? Does python run on Windows? If so, give me samples of input data and what you want as output. -- These are my opinions. I hate spam. ___ time-nuts mailing 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] Comparing PPS from 2 GPS units
On 12/14/12 8:47 PM, Hal Murray wrote: saidj...@aol.com said: Time-Nuts, anyone willing to write this for the benefit of all? Does python run on Windows? If so, give me samples of input data and what you want as output. Sure.. there's several flavors.. I use Active Python ___ time-nuts mailing 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] Inexpensive modular gps with 1pps
On Fri, Nov 16, 2012 at 9:10 AM, Hal Murray hmur...@megapathdsl.net wrote: jim...@earthlink.net said: Big enough that Synergy Garmin have pricing for anywhere from 1 to 1000 units I don't know of any GPS units with PPS that are both low cost and no soldering. There are several low cost units that come in a nice small package. But you can't just plug them into your PC. You have to provide power and add a connector. There are quite a few more units if you don't need a nice package. There are several no-soldering packages. I haven't seen one that is low cost. There are many low cost GPS devices that use USB without any soldering. They don't have PPS. Thank you, nice summary. One of my problems is that I am in Singapore. Soldering is not an issue in itself, but I cannot just order transistors and other small components online. You mention low cost units which require you to add a power connector, etc. Could you recommend any that can be bought online? With RS-232, please? -- Sanjeev Gupta +65 98551208 http://www.linkedin.com/in/ghane ___ time-nuts mailing 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] RaspberryPi and RADclock
From: paul swed Thanks. I really like the idea that a Rassberry Pi could be a time server. Maybe enough to get me going. Thanks === Paul, I wrote up my experiences with the Raspberry Pi as a standard NTP server here: http://www.satsignal.eu/ntp/Raspberry-Pi-NTP.html and the performance can be seen here: http://www.satsignal.eu/ntp/Raspberry-Pi-NTP.html#current http://www.satsignal.eu/mrtg/performance_ntp-pn.php Interestingly, the second RPi card is doing better than the first, and it does /not/ have gpsd installed, so relying on the LAW/WAN for its source of coarse seconds. But it has a timekeeping GPS and a slightly better located antenna as well - both antennas are indoors and some drop-outs show as spikes on RasPi-1. No gpsd appears to mean less CPU load. Compare: http://www.satsignal.eu/mrtg/performance_raspi-1.php http://www.satsignal.eu/mrtg/performance_raspi-2.php It looks like sub-microsecond might be possible in a temperature-controlled environment, as the main drift seems to be at 05:30 when the heating turns on: http://www.satsignal.eu/mrtg/performance_ntp.php?period=week Raspberry Pi 2 was only switched to GPS from LAN-only sync a few days ago. 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] Inexpensive modular gps with 1pps
Thank you, nice summary. One of my problems is that I am in Singapore. Soldering is not an issue in itself, but I cannot just order transistors and other small components online. You mention low cost units which require you to add a power connector, etc. Could you recommend any that can be bought online? With RS-232, please? Sanjeev Gupta = Sanjeev, It sounds as if this unit may suit: http://www.satsignal.eu/ntp/Sure-GPS.htm It has RS-232 (true levels, not CMOS) and requires only two wires to be soldered. Order from: http://www.sureelectronics.net/goods.php?id=99 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] Inexpensive modular gps with 1pps
How can being in Singapore be a problem for acquiring components online? Element14/Farnell have their Asian warehouse there, they even have free overnight delivery by courier to Malaysia where I currently live. ( Or just go offline and get down to Sim Lim tower and get your parts there ^_^_ ) -mats On Sat, Dec 15, 2012 at 2:41 PM, Sanjeev Gupta gha...@gmail.com wrote: One of my problems is that I am in Singapore. Soldering is not an issue in itself, but I cannot just order transistors and other small components online. -- Sanjeev Gupta +65 98551208 http://www.linkedin.com/in/ghane ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
