Re: [time-nuts] BVA Oscillaotrs
Hi Just to be very clear: a spec guarantee of 1.0 x 10^-13 at any tau between 1 second and 100 seconds is a very different thing than generally below 1.0x10^-12 at 1 second. That said, not all BVA's meet that spec. Bob On Aug 30, 2013, at 11:52 AM, Said Jackson saidj...@aol.com wrote: Steve, 10E-013 means 1E-012. But the BVAs run in the low xE-013, about 10x better than that. And they are specifically designed to give great ADEV from at least 1s to 30s and more. Agreed, its very easy to find fantastic phase noise performance from NEL, Pascal, Wenzel and others. That (-180dBc noise floor etc) seems to be no big deal these days, even though a very good Pascal ocxo will still cost as much as four CSACs or more. Please give some examples of oscillators that were designed specifically for ADEV performance and can be ordered with specific ADEV parameters or are known to have these kinds of performance levels typically, I don't know of many.. Maybe 1 out of 10 HP 10811 will have ADEV in the low xE-013 as far as I have seen. Tom Van Back has a nice treatise on the ADEV of a large number of 10811's he measured in his Z38xx gpsdos, only some are truly great. Thanks, Said Sent From iPhone On Aug 30, 2013, at 8:21, Martyn Smith mar...@ptsyst.com wrote: Hello, Today many manufacturers are producing 10 MHz oscillators that offer many advantages over BVA. Phase noise of -116 dBc @ 1 Hz with a -175 dBc noise floor, ageing of 5 x 10E-9 per month and a G sensitivity of 5 x 10E-11 /g in all axis is available on a new product. Also the short term Allan variance is in the low parts in 10E-13 for one second. It seems to me the only real advantage of BVA is the long term ageing and this can easily be sorted out by locking to a superior standard. Best Regards Steve ___ 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] BVA Oscillaotrs
Said - I bet you he meant exactly what you said, just had a mistake in the representation of the exponent. Hope all is well with you. Was just at GD all week. Regards - Mike Mike B. Feher, EOZ Inc. 89 Arnold Blvd. Howell, NJ, 07731 732-886-5960 office 908-902-3831 cell -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Said Jackson Sent: Friday, August 30, 2013 11:53 AM To: Discussion of precise time and frequency measurement Cc: time-nuts@febo.com Subject: Re: [time-nuts] BVA Oscillaotrs Steve, 10E-013 means 1E-012. But the BVAs run in the low xE-013, about 10x better than that. And they are specifically designed to give great ADEV from at least 1s to 30s and more. Agreed, its very easy to find fantastic phase noise performance from NEL, Pascal, Wenzel and others. That (-180dBc noise floor etc) seems to be no big deal these days, even though a very good Pascal ocxo will still cost as much as four CSACs or more. Please give some examples of oscillators that were designed specifically for ADEV performance and can be ordered with specific ADEV parameters or are known to have these kinds of performance levels typically, I don't know of many.. Maybe 1 out of 10 HP 10811 will have ADEV in the low xE-013 as far as I have seen. Tom Van Back has a nice treatise on the ADEV of a large number of 10811's he measured in his Z38xx gpsdos, only some are truly great. Thanks, Said Sent From iPhone On Aug 30, 2013, at 8:21, Martyn Smith mar...@ptsyst.com wrote: Hello, Today many manufacturers are producing 10 MHz oscillators that offer many advantages over BVA. Phase noise of -116 dBc @ 1 Hz with a -175 dBc noise floor, ageing of 5 x 10E-9 per month and a G sensitivity of 5 x 10E-11 /g in all axis is available on a new product. Also the short term Allan variance is in the low parts in 10E-13 for one second. It seems to me the only real advantage of BVA is the long term ageing and this can easily be sorted out by locking to a superior standard. Best Regards Steve ___ 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] BVA Oscillaotrs
Hi The BVA's were specifically targeted at very good ADEV performance. It's sort of a left brain / right brain sort of thing. The time people look at ADEV and close in is usually 1 second and sometimes 0.1 second. The frequency people look at phase noise and really low is often 10 Hz, and occasionally 1 Hz. The two measurements do sort of correspond to each other, but not entirely. One second ADEV at X does not directly map to 1 Hz phase noise at a level of Y. The frequency guys want to womp the signal up to something high, and their math is easy if they start with phase noise. The timing people use different math, and phase noise doesn't really do it for them. ADEV sort of works for timing applications. There are other more specific measures for certain timing needs. Bob On Aug 30, 2013, at 12:31 PM, Tom Knox act...@hotmail.com wrote: I may be mistaken but I thought the very close in Ultra Low Phase Noise was what the BVA name was built on, even more then Aging. But with the performance advances of Wenzel and others over the past few decades it is difficult to justify the price. Thomas Knox Ascent Concepts and Technology 4475 Whitney Place Boulder Colorado 80305 1-303-554-0307 From: li...@rtty.us Date: Fri, 30 Aug 2013 12:13:54 -0400 To: time-nuts@febo.com Subject: Re: [time-nuts] BVA Oscillaotrs Hi Just to be very clear: a spec guarantee of 1.0 x 10^-13 at any tau between 1 second and 100 seconds is a very different thing than generally below 1.0x10^-12 at 1 second. That said, not all BVA's meet that spec. Bob On Aug 30, 2013, at 11:52 AM, Said Jackson saidj...@aol.com wrote: Steve, 10E-013 means 1E-012. But the BVAs run in the low xE-013, about 10x better than that. And they are specifically designed to give great ADEV from at least 1s to 30s and more. Agreed, its very easy to find fantastic phase noise performance from NEL, Pascal, Wenzel and others. That (-180dBc noise floor etc) seems to be no big deal these days, even though a very good Pascal ocxo will still cost as much as four CSACs or more. Please give some examples of oscillators that were designed specifically for ADEV performance and can be ordered with specific ADEV parameters or are known to have these kinds of performance levels typically, I don't know of many.. Maybe 1 out of 10 HP 10811 will have ADEV in the low xE-013 as far as I have seen. Tom Van Back has a nice treatise on the ADEV of a large number of 10811's he measured in his Z38xx gpsdos, only some are truly great. Thanks, Said Sent From iPhone On Aug 30, 2013, at 8:21, Martyn Smith mar...@ptsyst.com wrote: Hello, Today many manufacturers are producing 10 MHz oscillators that offer many advantages over BVA. Phase noise of -116 dBc @ 1 Hz with a -175 dBc noise floor, ageing of 5 x 10E-9 per month and a G sensitivity of 5 x 10E-11 /g in all axis is available on a new product. Also the short term Allan variance is in the low parts in 10E-13 for one second. It seems to me the only real advantage of BVA is the long term ageing and this can easily be sorted out by locking to a superior standard. Best Regards Steve ___ 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] BVA Oscillaotrs
Steve, 10E-013 means 1E-012. But the BVAs run in the low xE-013, about 10x better than that. And they are specifically designed to give great ADEV from at least 1s to 30s and more. Agreed, its very easy to find fantastic phase noise performance from NEL, Pascal, Wenzel and others. That (-180dBc noise floor etc) seems to be no big deal these days, even though a very good Pascal ocxo will still cost as much as four CSACs or more. Please give some examples of oscillators that were designed specifically for ADEV performance and can be ordered with specific ADEV parameters or are known to have these kinds of performance levels typically, I don't know of many.. Maybe 1 out of 10 HP 10811 will have ADEV in the low xE-013 as far as I have seen. Tom Van Back has a nice treatise on the ADEV of a large number of 10811's he measured in his Z38xx gpsdos, only some are truly great. Thanks, Said Sent From iPhone On Aug 30, 2013, at 8:21, Martyn Smith mar...@ptsyst.com wrote: Hello, Today many manufacturers are producing 10 MHz oscillators that offer many advantages over BVA. Phase noise of -116 dBc @ 1 Hz with a -175 dBc noise floor, ageing of 5 x 10E-9 per month and a G sensitivity of 5 x 10E-11 /g in all axis is available on a new product. Also the short term Allan variance is in the low parts in 10E-13 for one second. It seems to me the only real advantage of BVA is the long term ageing and this can easily be sorted out by locking to a superior standard. Best Regards Steve ___ 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] BVA Oscillaotrs
I may be mistaken but I thought the very close in Ultra Low Phase Noise was what the BVA name was built on, even more then Aging. But with the performance advances of Wenzel and others over the past few decades it is difficult to justify the price. Thomas Knox Ascent Concepts and Technology 4475 Whitney Place Boulder Colorado 80305 1-303-554-0307 From: li...@rtty.us Date: Fri, 30 Aug 2013 12:13:54 -0400 To: time-nuts@febo.com Subject: Re: [time-nuts] BVA Oscillaotrs Hi Just to be very clear: a spec guarantee of 1.0 x 10^-13 at any tau between 1 second and 100 seconds is a very different thing than generally below 1.0x10^-12 at 1 second. That said, not all BVA's meet that spec. Bob On Aug 30, 2013, at 11:52 AM, Said Jackson saidj...@aol.com wrote: Steve, 10E-013 means 1E-012. But the BVAs run in the low xE-013, about 10x better than that. And they are specifically designed to give great ADEV from at least 1s to 30s and more. Agreed, its very easy to find fantastic phase noise performance from NEL, Pascal, Wenzel and others. That (-180dBc noise floor etc) seems to be no big deal these days, even though a very good Pascal ocxo will still cost as much as four CSACs or more. Please give some examples of oscillators that were designed specifically for ADEV performance and can be ordered with specific ADEV parameters or are known to have these kinds of performance levels typically, I don't know of many.. Maybe 1 out of 10 HP 10811 will have ADEV in the low xE-013 as far as I have seen. Tom Van Back has a nice treatise on the ADEV of a large number of 10811's he measured in his Z38xx gpsdos, only some are truly great. Thanks, Said Sent From iPhone On Aug 30, 2013, at 8:21, Martyn Smith mar...@ptsyst.com wrote: Hello, Today many manufacturers are producing 10 MHz oscillators that offer many advantages over BVA. Phase noise of -116 dBc @ 1 Hz with a -175 dBc noise floor, ageing of 5 x 10E-9 per month and a G sensitivity of 5 x 10E-11 /g in all axis is available on a new product. Also the short term Allan variance is in the low parts in 10E-13 for one second. It seems to me the only real advantage of BVA is the long term ageing and this can easily be sorted out by locking to a superior standard. Best Regards Steve ___ 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] BVA Oscillaotrs
Hello, Today many manufacturers are producing 10 MHz oscillators that offer many advantages over BVA. Phase noise of -116 dBc @ 1 Hz with a -175 dBc noise floor, ageing of 5 x 10E-9 per month and a G sensitivity of 5 x 10E-11 /g in all axis is available on a new product. Also the short term Allan variance is in the low parts in 10E-13 for one second. It seems to me the only real advantage of BVA is the long term ageing and this can easily be sorted out by locking to a superior standard. Best Regards Steve ___ 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] BVA Oscillaotrs
Thomas, As Bob mentions phase noise and ADEV are not the same thing. We have a very good PN Wenzel here, and it has horrible ADEV. The BVA has much worse phase noise but 100x or so better ADEV than the Wenzel at 100s. These are apples and oranges. ADEV in the low xE-013 for 1s to 30+s is extremely hard to find and if you happen to need it quit expensive too. On top of that you will have to shell out about $15,000 or so to get equipment that can consistently measure at that level nowadays. Bye, Said Sent From iPhone On Aug 30, 2013, at 9:31, Tom Knox act...@hotmail.com wrote: I may be mistaken but I thought the very close in Ultra Low Phase Noise was what the BVA name was built on, even more then Aging. But with the performance advances of Wenzel and others over the past few decades it is difficult to justify the price. Thomas Knox Ascent Concepts and Technology 4475 Whitney Place Boulder Colorado 80305 1-303-554-0307 From: li...@rtty.us Date: Fri, 30 Aug 2013 12:13:54 -0400 To: time-nuts@febo.com Subject: Re: [time-nuts] BVA Oscillaotrs Hi Just to be very clear: a spec guarantee of 1.0 x 10^-13 at any tau between 1 second and 100 seconds is a very different thing than generally below 1.0x10^-12 at 1 second. That said, not all BVA's meet that spec. Bob On Aug 30, 2013, at 11:52 AM, Said Jackson saidj...@aol.com wrote: Steve, 10E-013 means 1E-012. But the BVAs run in the low xE-013, about 10x better than that. And they are specifically designed to give great ADEV from at least 1s to 30s and more. Agreed, its very easy to find fantastic phase noise performance from NEL, Pascal, Wenzel and others. That (-180dBc noise floor etc) seems to be no big deal these days, even though a very good Pascal ocxo will still cost as much as four CSACs or more. Please give some examples of oscillators that were designed specifically for ADEV performance and can be ordered with specific ADEV parameters or are known to have these kinds of performance levels typically, I don't know of many.. Maybe 1 out of 10 HP 10811 will have ADEV in the low xE-013 as far as I have seen. Tom Van Back has a nice treatise on the ADEV of a large number of 10811's he measured in his Z38xx gpsdos, only some are truly great. Thanks, Said Sent From iPhone On Aug 30, 2013, at 8:21, Martyn Smith mar...@ptsyst.com wrote: Hello, Today many manufacturers are producing 10 MHz oscillators that offer many advantages over BVA. Phase noise of -116 dBc @ 1 Hz with a -175 dBc noise floor, ageing of 5 x 10E-9 per month and a G sensitivity of 5 x 10E-11 /g in all axis is available on a new product. Also the short term Allan variance is in the low parts in 10E-13 for one second. It seems to me the only real advantage of BVA is the long term ageing and this can easily be sorted out by locking to a superior standard. Best Regards Steve ___ 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.
