Re: [time-nuts] UK: Notice of Interruption to MSF 60 kHz Time and Frequency Signal
They also shut down for a couple of hours every month, just like they did when it was at Rugby. Interestingly when discussions about upgrading/moving MSF were made, it was suggested that sufficient redundancy would be built into the system to enable them to run the service without any shutdowns. Not sure what happened to this. Rob Kimberley -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of David J Taylor Sent: 28 April 2011 3:02 PM To: time-nuts@febo.com Subject: [time-nuts] UK: Notice of Interruption to MSF 60 kHz Time and Frequency Signal I have received the following: Notice of Interruption to MSF 60 kHz Time and Frequency Signal The MSF 60 kHz time and frequency signal broadcast from Anthorn Radio Station will be shut down over the period: 03 May 2011 to 13 May 2011 Each day including weekends from 07:00 BST until 22:00 BST The interruption to the transmission is required to allow maintenance work to be carried out in safety. The signal may be restored early if the work is completed early on any particular day. Cheers, 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] UK: Notice of Interruption to MSF 60 kHz Timeand Frequency Signal
Hi Rob, it was mentioned to me by someone that if it was aerial mantenance, then they had to shut the whole site down not just the transmitter feeding the mast they were working on. I think they are duplicated on electronic hardware. Alan G3NYK - Original Message - From: Rob Kimberley r...@timing-consultants.com To: 'David J Taylor' david-tay...@blueyonder.co.uk; 'Discussion of precise time and frequency measurement' time-nuts@febo.com Sent: Friday, April 29, 2011 2:37 PM Subject: Re: [time-nuts] UK: Notice of Interruption to MSF 60 kHz Timeand Frequency Signal They also shut down for a couple of hours every month, just like they did when it was at Rugby. Interestingly when discussions about upgrading/moving MSF were made, it was suggested that sufficient redundancy would be built into the system to enable them to run the service without any shutdowns. Not sure what happened to this. Rob Kimberley -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of David J Taylor Sent: 28 April 2011 3:02 PM To: time-nuts@febo.com Subject: [time-nuts] UK: Notice of Interruption to MSF 60 kHz Time and Frequency Signal I have received the following: Notice of Interruption to MSF 60 kHz Time and Frequency Signal The MSF 60 kHz time and frequency signal broadcast from Anthorn Radio Station will be shut down over the period: 03 May 2011 to 13 May 2011 Each day including weekends from 07:00 BST until 22:00 BST The interruption to the transmission is required to allow maintenance work to be carried out in safety. The signal may be restored early if the work is completed early on any particular day. Cheers, 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. ___ 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] Power supply noise
On Thu, 28 Apr 2011 17:04:25 -0600 Joseph Gray jg...@zianet.com wrote: Power supply noise and ripple has been mentioned before, in relation to OCXO's and rubidiums. So, what is considered acceptable in these applications? This highly depends on your system and what you want to achieve. Just like anything else in engineering ;-) For OCXOs you have usually a frequency variation on power supply voltage change or something similar. I guess Rb's have something similar (dont have a data sheet at hand). From this you can guestimate how much modulation you get on PSU noise. If you have this, then you can calculate how much noise you get from the other components in the path of your signal, with regard to the PSU noise. After you have that value, you can cross check with the stabilty you wanted go achieve. Although this looks quite simple, there is a slight problem with this approach: PSU noise often induces non-linear behavior in circuits. And often, the behavior varies a lot with the frequency of the noise. Ie you'd have to model a PSU noise transfer function for each device, but there no data for this (unless you measure it yourself). So, usually the approach is to build a system that has very little PSU noise. Eg use an LDO after a switched power supply to get rid of the switching noise. If this isnt enough, use additional filters or noise reduction LDOs (special LDOs made to filter out noise). If this still isnt enough, add more filters... until you are satisfied. Attila Kinali -- The trouble with you, Shev, is you don't say anything until you've saved up a whole truckload of damned heavy brick arguments and then you dump them all out and never look at the bleeding body mangled beneath the heap -- Tirin, The Dispossessed, U. Le Guin ___ 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] Power supply noise
...and I used to think batteries were a good/clean source of power. They are better than a linear power supply... yet they make very good temperature sensors too! What is the perfect source of power? Clean, no ripple, no variation based on temperature, etc.? - Original Message - From: Attila Kinali att...@kinali.ch To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Friday, April 29, 2011 11:11 AM Subject: Re: [time-nuts] Power supply noise On Thu, 28 Apr 2011 17:04:25 -0600 Joseph Gray jg...@zianet.com wrote: Power supply noise and ripple has been mentioned before, in relation to OCXO's and rubidiums. So, what is considered acceptable in these applications? This highly depends on your system and what you want to achieve. Just like anything else in engineering ;-) For OCXOs you have usually a frequency variation on power supply voltage change or something similar. I guess Rb's have something similar (dont have a data sheet at hand). From this you can guestimate how much modulation you get on PSU noise. If you have this, then you can calculate how much noise you get from the other components in the path of your signal, with regard to the PSU noise. After you have that value, you can cross check with the stabilty you wanted go achieve. Although this looks quite simple, there is a slight problem with this approach: PSU noise often induces non-linear behavior in circuits. And often, the behavior varies a lot with the frequency of the noise. Ie you'd have to model a PSU noise transfer function for each device, but there no data for this (unless you measure it yourself). So, usually the approach is to build a system that has very little PSU noise. Eg use an LDO after a switched power supply to get rid of the switching noise. If this isnt enough, use additional filters or noise reduction LDOs (special LDOs made to filter out noise). If this still isnt enough, add more filters... until you are satisfied. Attila Kinali -- The trouble with you, Shev, is you don't say anything until you've saved up a whole truckload of damned heavy brick arguments and then you dump them all out and never look at the bleeding body mangled beneath the heap -- Tirin, The Dispossessed, U. Le Guin ___ 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. - No virus found in this message. Checked by AVG - www.avg.com Version: 10.0.1321 / Virus Database: 1500/3605 - Release Date: 04/29/11 - No virus found in this message. Checked by AVG - www.avg.com Version: 10.0.1321 / Virus Database: 1500/3605 - Release Date: 04/29/11 ___ 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] Power supply noise
How much are you willing to pay? Regards. Max. K 4 O D S. Email: m...@maxsmusicplace.com Transistor site http://www.funwithtransistors.net Vacuum tube site: http://www.funwithtubes.net Music site: http://www.maxsmusicplace.com To subscribe to the fun with transistors group send an email to. funwithtransistors-subscr...@yahoogroups.com To subscribe to the fun with tubes group send an email to, funwithtubes-subscr...@yahoogroups.com - Original Message - From: Heathkid heath...@heathkid.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Friday, April 29, 2011 10:35 PM Subject: Re: [time-nuts] Power supply noise ...and I used to think batteries were a good/clean source of power. They are better than a linear power supply... yet they make very good temperature sensors too! What is the perfect source of power? Clean, no ripple, no variation based on temperature, etc.? - Original Message - From: Attila Kinali att...@kinali.ch To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Friday, April 29, 2011 11:11 AM Subject: Re: [time-nuts] Power supply noise On Thu, 28 Apr 2011 17:04:25 -0600 Joseph Gray jg...@zianet.com wrote: Power supply noise and ripple has been mentioned before, in relation to OCXO's and rubidiums. So, what is considered acceptable in these applications? This highly depends on your system and what you want to achieve. Just like anything else in engineering ;-) For OCXOs you have usually a frequency variation on power supply voltage change or something similar. I guess Rb's have something similar (dont have a data sheet at hand). From this you can guestimate how much modulation you get on PSU noise. If you have this, then you can calculate how much noise you get from the other components in the path of your signal, with regard to the PSU noise. After you have that value, you can cross check with the stabilty you wanted go achieve. Although this looks quite simple, there is a slight problem with this approach: PSU noise often induces non-linear behavior in circuits. And often, the behavior varies a lot with the frequency of the noise. Ie you'd have to model a PSU noise transfer function for each device, but there no data for this (unless you measure it yourself). So, usually the approach is to build a system that has very little PSU noise. Eg use an LDO after a switched power supply to get rid of the switching noise. If this isnt enough, use additional filters or noise reduction LDOs (special LDOs made to filter out noise). If this still isnt enough, add more filters... until you are satisfied. Attila Kinali -- The trouble with you, Shev, is you don't say anything until you've saved up a whole truckload of damned heavy brick arguments and then you dump them all out and never look at the bleeding body mangled beneath the heap -- Tirin, The Dispossessed, U. Le Guin ___ 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. - No virus found in this message. Checked by AVG - www.avg.com Version: 10.0.1321 / Virus Database: 1500/3605 - Release Date: 04/29/11 - No virus found in this message. Checked by AVG - www.avg.com Version: 10.0.1321 / Virus Database: 1500/3605 - Release Date: 04/29/11 ___ 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.
