Re: [time-nuts] Affordable (cheap) COTS / eBay kit for TIE / 1PPS phase comparison
Thanks for your suggestions so far everyone, The picPET would be a great solution if it could run at higher frequencies - but now there's a separate thread about that :) Magnus - my reference is a Brilliant Telecom (now Juniper Networks TCA series) PTP grandmaster (TCA8000), which does PTP and has E1/T1/BITS/frequency outputs. Internally it uses a Trimble Resolution T board for GPS/PPS. I think it could run Rubidium if I replaced the OCXO with a SpectraTime LPFRS. I'm familiar with Stable32 and I have a basic understanding of frequency stability / phase noise measurement concepts, but for the most part I will be simply looking at realtime phase offset measurement to test filtering and PI servo optimisations. Regards Wojciech ___ time-nuts mailing 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] Affordable (cheap) COTS / eBay kit for TIE / 1PPS phase comparison
Wojciech, On 23/01/14 14:46, Wojciech Owczarek wrote: Thanks for your suggestions so far everyone, The picPET would be a great solution if it could run at higher frequencies - but now there's a separate thread about that :) Magnus - my reference is a Brilliant Telecom (now Juniper Networks TCA series) PTP grandmaster (TCA8000), which does PTP and has E1/T1/BITS/frequency outputs. Internally it uses a Trimble Resolution T board for GPS/PPS. I think it could run Rubidium if I replaced the OCXO with a SpectraTime LPFRS. Doesn't sound like a bad start. I'm familiar with Stable32 and I have a basic understanding of frequency stability / phase noise measurement concepts, but for the most part I will be simply looking at realtime phase offset measurement to test filtering and PI servo optimisations. Ah, yes. Then you are off to a good start. Timelab will serve you well then. You might enjoy Stefano Breggni:s book in that case. Cheers, Magnus ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Affordable (cheap) COTS / eBay kit for TIE / 1PPS phase comparison
Hi, On 22/01/14 02:46, Bob Camp wrote: Hi You can do a lot better than 5 ns these days if you want to spend some money. Some low(er) cost alternatives: 5335 counter running GPIB. The counter should be below $150 and it should get you to 1 ns or so. 5334 counter also running GPIB. A bit smaller / cheaper - should be around 2 ns. Both are staple items on the auction sites. You would still need a GPIB adapter and a PC to collect the data and do the analysis. Sounds like you have the PC. The USB adapters aren’t very expensive. You already have a GPS clock. May I ask what it is? The HP5335A will certainly get you of in the right direction for very reasonable money. Just make sure it is operational. Used one for that purpose at work today. The ProLogix GPIB interface is a great way to get started: http://prologix.biz/ The fourth component is TimeLab, which is a lovely tool to get started with. http://www.ke5fx.com/timelab/readme.htm You can improve your measurement floor by squaring up the signal before entering the counter. There are various ways to do that. I use a pair of TADD-2 for dividers, but with the input squared up brought out onto a spare BNC. http://www.tapr.org/kits_tadd-2.html Depending on what you are doing, you might want to go deeper, but let us know what you need and I'm sure we can give you some guidance. Cheers, Magnus ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Affordable (cheap) COTS / eBay kit for TIE / 1PPS phase comparison
Hi, For a low cost startup have a look at a picPET http://www.leapsecond.com/pic/picpet.htm and TimeLab http://www.ke5fx.com/timelab/readme.htm Less than $10 including shipping! From: Wojciech Owczarek wojci...@owczarek.co.uk To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Wednesday, 22 January 2014, 1:23 Subject: [time-nuts] Affordable (cheap) COTS / eBay kit for TIE / 1PPS phase comparison Hi List, I'm a software developer turned network test engineer slowly turning timefrequency guy (not sure if this is upwards or downwards ;-) ) with some distant background in electronic engineering. For the last couple of years I have been increasingly involved in various work involving IEEE 1588 and finally I started fitting out a small home lab setup. I never really needed lab kit at home before and my work lab is primary to do with Ethernet and IP (and timing, but outside my price ranges), so I was wondering if you could point me in the right direction: I'm looking for some reasonably inexpensive solution to allow me a) to do TIE measurements of 1PPS signals against a reference and b) do phase comparisons of different 1PPS signals - so something with REF and at least two inputs. I have an OCXO GPS reference (upgradable to Rb) with 1PPS, 5MHz and 10MHz outputs which is stable enough for my needs so that part (perhaps most important) is sorted. In terms of requirements, granularity wise, well, as good as achievable - I'm used to 10 ns and 5 ns granularity with TIE that I get from work kit. 50 ns or better would be perfect. I must add that ideally I would like to avoid having to design or build the kit myself - I would love a project, but I have time to spare to complete one. Any pointers much appreciated. Best regards Wojciech -- - Wojciech Owczarek ___ time-nuts mailing 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] Affordable (cheap) COTS / eBay kit for TIE / 1PPS phase comparison
As much as I'm fond of my picPET it has 400 ns resolution and not intended to replace a 5 or 10 or 50 ns TIC (which is what the OP asked for). /tvb (i5s) On Jan 22, 2014, at 5:12 PM, Robert Atkinson robert8...@yahoo.co.uk wrote: Hi, For a low cost startup have a look at a picPET http://www.leapsecond.com/pic/picpet.htm and TimeLab http://www.ke5fx.com/timelab/readme.htm Less than $10 including shipping! From: Wojciech Owczarek wojci...@owczarek.co.uk To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Wednesday, 22 January 2014, 1:23 Subject: [time-nuts] Affordable (cheap) COTS / eBay kit for TIE / 1PPS phase comparison Hi List, I'm a software developer turned network test engineer slowly turning timefrequency guy (not sure if this is upwards or downwards ;-) ) with some distant background in electronic engineering. For the last couple of years I have been increasingly involved in various work involving IEEE 1588 and finally I started fitting out a small home lab setup. I never really needed lab kit at home before and my work lab is primary to do with Ethernet and IP (and timing, but outside my price ranges), so I was wondering if you could point me in the right direction: I'm looking for some reasonably inexpensive solution to allow me a) to do TIE measurements of 1PPS signals against a reference and b) do phase comparisons of different 1PPS signals - so something with REF and at least two inputs. I have an OCXO GPS reference (upgradable to Rb) with 1PPS, 5MHz and 10MHz outputs which is stable enough for my needs so that part (perhaps most important) is sorted. In terms of requirements, granularity wise, well, as good as achievable - I'm used to 10 ns and 5 ns granularity with TIE that I get from work kit. 50 ns or better would be perfect. I must add that ideally I would like to avoid having to design or build the kit myself - I would love a project, but I have time to spare to complete one. Any pointers much appreciated. Best regards Wojciech -- - Wojciech Owczarek ___ time-nuts mailing 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] Affordable (cheap) COTS / eBay kit for TIE / 1PPS phase comparison
Hi List, I'm a software developer turned network test engineer slowly turning timefrequency guy (not sure if this is upwards or downwards ;-) ) with some distant background in electronic engineering. For the last couple of years I have been increasingly involved in various work involving IEEE 1588 and finally I started fitting out a small home lab setup. I never really needed lab kit at home before and my work lab is primary to do with Ethernet and IP (and timing, but outside my price ranges), so I was wondering if you could point me in the right direction: I'm looking for some reasonably inexpensive solution to allow me a) to do TIE measurements of 1PPS signals against a reference and b) do phase comparisons of different 1PPS signals - so something with REF and at least two inputs. I have an OCXO GPS reference (upgradable to Rb) with 1PPS, 5MHz and 10MHz outputs which is stable enough for my needs so that part (perhaps most important) is sorted. In terms of requirements, granularity wise, well, as good as achievable - I'm used to 10 ns and 5 ns granularity with TIE that I get from work kit. 50 ns or better would be perfect. I must add that ideally I would like to avoid having to design or build the kit myself - I would love a project, but I have time to spare to complete one. Any pointers much appreciated. Best regards Wojciech -- - Wojciech Owczarek ___ time-nuts mailing 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] Affordable (cheap) COTS / eBay kit for TIE / 1PPS phase comparison
Hi You can do a lot better than 5 ns these days if you want to spend some money. Some low(er) cost alternatives: 5335 counter running GPIB. The counter should be below $150 and it should get you to 1 ns or so. 5334 counter also running GPIB. A bit smaller / cheaper - should be around 2 ns. Both are staple items on the auction sites. You would still need a GPIB adapter and a PC to collect the data and do the analysis. Sounds like you have the PC. The USB adapters aren’t very expensive. Bob On Jan 21, 2014, at 8:23 PM, Wojciech Owczarek wojci...@owczarek.co.uk wrote: Hi List, I'm a software developer turned network test engineer slowly turning timefrequency guy (not sure if this is upwards or downwards ;-) ) with some distant background in electronic engineering. For the last couple of years I have been increasingly involved in various work involving IEEE 1588 and finally I started fitting out a small home lab setup. I never really needed lab kit at home before and my work lab is primary to do with Ethernet and IP (and timing, but outside my price ranges), so I was wondering if you could point me in the right direction: I'm looking for some reasonably inexpensive solution to allow me a) to do TIE measurements of 1PPS signals against a reference and b) do phase comparisons of different 1PPS signals - so something with REF and at least two inputs. I have an OCXO GPS reference (upgradable to Rb) with 1PPS, 5MHz and 10MHz outputs which is stable enough for my needs so that part (perhaps most important) is sorted. In terms of requirements, granularity wise, well, as good as achievable - I'm used to 10 ns and 5 ns granularity with TIE that I get from work kit. 50 ns or better would be perfect. I must add that ideally I would like to avoid having to design or build the kit myself - I would love a project, but I have time to spare to complete one. Any pointers much appreciated. Best regards Wojciech -- - Wojciech Owczarek ___ time-nuts mailing 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] Affordable (cheap) COTS / eBay kit for TIE / 1PPS phase comparison
I meant I have *no* time to spare to complete one. Thanks Wojciech ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
