Re: [time-nuts] DMTD to MMTD

Lux, Jim (337C) wrote: -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob Camp Sent: Wednesday, February 17, 2010 4:24 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] DMTD to MMTD Hi No Windows

Re: [time-nuts] DMTD to MMTD

-nuts] DMTD to MMTD The latest version actually records time stamps from a continuously running counter clocked at some at a constant frequency (100Mhz??)for all channels simultaneously. They may use a flag bit for each for each channel to indicate to which channel or channels the zero crossing time

Re: [time-nuts] DMTD to MMTD

measurement Subject: Re: [time-nuts] DMTD to MMTD The latest version actually records time stamps from a continuously running counter clocked at some at a constant frequency (100Mhz??)for all channels simultaneously. They may use a flag bit for each for each channel to indicate to which channel or channels

Re: [time-nuts] DMTD to MMTD

Griffiths Sent: Thursday, February 18, 2010 7:28 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] DMTD to MMTD Magnus Danielson wrote: Bruce Griffiths wrote: Lux, Jim (337C) wrote: -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts

Re: [time-nuts] DMTD to MMTD

[mailto:time-nuts-boun...@febo.com] On Behalf Of Bruce Griffiths Sent: Thursday, February 18, 2010 7:28 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] DMTD to MMTD Magnus Danielson wrote: Bruce Griffiths wrote: Lux, Jim (337C) wrote: -Original

Re: [time-nuts] DMTD to MMTD

and frequency measurement Subject: Re: [time-nuts] DMTD to MMTD The latest version actually records time stamps from a continuously running counter clocked at some at a constant frequency (100Mhz??)for all channels simultaneously. They may use a flag bit for each for each channel to indicate

Re: [time-nuts] DMTD to MMTD

Bob Camp wrote: Hi DMTD looks at a pair of sources (crystal, rubidium, maser .) and tells you the difference between them. If you looked at more than two, you can better characterize the individual sources. Any good papers out there on taking the DMTD approach and extending it to

Re: [time-nuts] DMTD to MMTD

To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] DMTD to MMTD Bob Camp wrote: Hi DMTD looks at a pair of sources (crystal, rubidium, maser .) and tells you the difference between them. If you looked at more than two, you can better characterize the individual

Re: [time-nuts] DMTD to MMTD

Lux, Jim (337C) wrote: -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob Camp Sent: Wednesday, February 17, 2010 1:57 PM To: 'Discussion of precise time and frequency measurement' Subject: Re: [time-nuts] DMTD to MMTD Hi Thanks

Re: [time-nuts] DMTD to MMTD

-Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Bruce Griffiths Sent: Wednesday, February 17, 2010 2:27 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] DMTD to MMTD Lux, Jim (337C) wrote

Re: [time-nuts] DMTD to MMTD

Bruce Griffiths wrote: Bob Camp wrote: Hi DMTD looks at a pair of sources (crystal, rubidium, maser .) and tells you the difference between them. If you looked at more than two, you can better characterize the individual sources. Any good papers out there on taking the DMTD approach

Re: [time-nuts] DMTD to MMTD

and frequency measurement Subject: Re: [time-nuts] DMTD to MMTD Bob Camp wrote: Hi DMTD looks at a pair of sources (crystal, rubidium, maser .) and tells you the difference between them. If you looked at more than two, you can better characterize the individual sources. Any

Re: [time-nuts] DMTD to MMTD

JPL have had such systems for many years: http://tmo.jpl.nasa.gov/progress_report/42-169/169B.pdfhttp://tmo.jpl.nasa.gov/progress_report/42- 169/169B.pdf http://tycho.usno.navy.mil/ptti/1994/Vol%2026_25.pdf Bruce Additional papers:

Re: [time-nuts] DMTD to MMTD

Lux, Jim (337C) wrote: -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Bruce Griffiths Sent: Wednesday, February 17, 2010 2:10 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] DMTD to MMTD

Re: [time-nuts] DMTD to MMTD

Hi With the number of gates you get today, taking the word length out to 32 bits it pretty easy. That helps on roll over, not so much on data rate Bob On Feb 17, 2010, at 7:09 PM, Lux, Jim (337C) wrote: I don't know if there's a FIFO in front of the UART (e.g. what if you get

Re: [time-nuts] DMTD to MMTD

-Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Bruce Griffiths Sent: Wednesday, February 17, 2010 4:20 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] DMTD to MMTD Lux, Jim (337C) wrote

Re: [time-nuts] DMTD to MMTD

Yet another reason to use an operating system that doesn't enforce such arcane requirements intended as part of an insidious content protection systems that prevent one from acquiring ones own data. Bruce Bob Camp wrote: Hi No Windows 7 driver signing issues with a serial port. USB can be a