Re: [time-nuts] time-nuts Digest, Vol 96, Issue 70
Wow! Great info. The 5v mag mount antennae are working, but the receivers are cycling between 2-D and 3-D (5 or 6-bird) modes. With the 26dB trimbles, I suspect I'm loosing ~5db in the 30ft of crumby RG-5, and a little pattern with my rain-gutter backplane. I don't have too much arial obstruction, but that's no excuse from overkill: I'll be on the lookout for 26- or 40[?!?]-dB cones. Does anyone have a Lucent part number available? -CH On Jul 17, 2012, at 5:00, time-nuts-requ...@febo.com wrote: Send time-nuts mailing list submissions to time-nuts@febo.com To subscribe or unsubscribe via the World Wide Web, visit https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts or, via email, send a message with subject or body 'help' to time-nuts-requ...@febo.com You can reach the person managing the list at time-nuts-ow...@febo.com When replying, please edit your Subject line so it is more specific than Re: Contents of time-nuts digest... Today's Topics: 1. Re: XL-DC Antenna Requirements (Tom Knox) 2. Re: XL-DC Antenna Requirements (Bob Martin) -- Message: 1 Date: Mon, 16 Jul 2012 18:11:59 -0600 From: Tom Knox act...@hotmail.com To: Time-Nuts time-nuts@febo.com Subject: Re: [time-nuts] XL-DC Antenna Requirements Message-ID: bay162-w4046e629af83f1d3bded81df...@phx.gbl Content-Type: text/plain; charset=iso-8859-1 Hi Chris; There were a number of XL-DC produced with 12vdc antenna power and should be marked near the connector. There are also some marked Down converter required. Other then then those the 58532A is a great choice andf sold under a number of names such as VIC-100, the Lucent antennas are also nice. The lucent are available in three gains 20, 26, 40 dB version. Most are the 26dB version and are a great product. Placement can be important, and although you could use indoors it will perform best as low as possible with a full view of the sky. (Low to avoid terrestrial interference). Thomas Knox Date: Tue, 17 Jul 2012 00:50:02 +0200 From: azelio.bori...@screen.it To: time-nuts@febo.com Subject: Re: [time-nuts] XL-DC Antenna Requirements The XL-DC is a 6 channels receiver, so no other benefit other than a greater probability to see constantly 6 satellites is gained from 24 to 32 satellites constellation. On Mon, Jul 16, 2012 at 11:59 PM, Chris Hoffman cq.k...@gmail.com wrote: All, Though somewhat outmoded, looking forward to starting my own time shop with two XL-DC controllers that I have been lucky enough to pick up recently. My question: Do I really need to invest in the likes of the HP 58532A antennae, or will my surplus Trimble magnetic antennae -- magnetically attached to a random ferrous backplane -- do? I guess what I am really asking: what are the relevant antenna design requirements here, and does the advent of as 32-satellite-constellation have any effect upon the antenna choice (i.e. design downgrade) for the TrueTime XL-DC? -CH Chris Hoffman cq.k...@gmail.com http://ar.ctur.us -CH Chris Hoffman cq.k...@gmail.com http://ar.ctur.us ___ 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. -- Message: 2 Date: Mon, 16 Jul 2012 18:02:49 -0700 From: Bob Martin k6...@comcast.net To: time-nuts@febo.com Subject: Re: [time-nuts] XL-DC Antenna Requirements Message-ID: 8dbef16d-ce19-4088-9347-458c02a53...@comcast.net Content-Type: text/plain;charset=us-ascii Chris-- The 58532A is somewhat higher gain (30dBi or better) than most mag-mount antennas (26dBi typ IIRC). The pointy nature of the 58532A also serves as an avian deterrent, reducing the accumulation of attenuating deposits... Running two receivers, I would highly recommend a real GPS distribution amp such as the 58535A. Such a beast will let you run both receivers from one antenna, while providing isolation between the receivers. I just happen to have one handy, having recently pulled it out of service and replaced it with a 4-port model to better support my time-nuttiness. Contact me off list if you would be interested. 73 Bob k6...@arrl.net On Jul 16, 2012, at 16:01, time-nuts-requ...@febo.com wrote: Message: 1 Date: Mon, 16 Jul 2012 14:59:52 -0700 From: Chris Hoffman cq.k...@gmail.com To: time-nuts@febo.com Subject: [time-nuts] XL-DC Antenna Requirements Message-ID: 0208b173-9f7b-49b9-ae83-ee231ebba...@gmail.com Content-Type: text/plain;
Re: [time-nuts] time-nuts Digest, Vol 96, Issue 70
Hi The antenna gain is likely *plenty* for that short a run of coax. Bob -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Chris Hoffman, KG6O Sent: Tuesday, July 17, 2012 11:16 AM To: time-nuts@febo.com Subject: Re: [time-nuts] time-nuts Digest, Vol 96, Issue 70 Wow! Great info. The 5v mag mount antennae are working, but the receivers are cycling between 2-D and 3-D (5 or 6-bird) modes. With the 26dB trimbles, I suspect I'm loosing ~5db in the 30ft of crumby RG-5, and a little pattern with my rain-gutter backplane. I don't have too much arial obstruction, but that's no excuse from overkill: I'll be on the lookout for 26- or 40[?!?]-dB cones. Does anyone have a Lucent part number available? -CH On Jul 17, 2012, at 5:00, time-nuts-requ...@febo.com wrote: Send time-nuts mailing list submissions to time-nuts@febo.com To subscribe or unsubscribe via the World Wide Web, visit https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts or, via email, send a message with subject or body 'help' to time-nuts-requ...@febo.com You can reach the person managing the list at time-nuts-ow...@febo.com When replying, please edit your Subject line so it is more specific than Re: Contents of time-nuts digest... Today's Topics: 1. Re: XL-DC Antenna Requirements (Tom Knox) 2. Re: XL-DC Antenna Requirements (Bob Martin) -- Message: 1 Date: Mon, 16 Jul 2012 18:11:59 -0600 From: Tom Knox act...@hotmail.com To: Time-Nuts time-nuts@febo.com Subject: Re: [time-nuts] XL-DC Antenna Requirements Message-ID: bay162-w4046e629af83f1d3bded81df...@phx.gbl Content-Type: text/plain; charset=iso-8859-1 Hi Chris; There were a number of XL-DC produced with 12vdc antenna power and should be marked near the connector. There are also some marked Down converter required. Other then then those the 58532A is a great choice andf sold under a number of names such as VIC-100, the Lucent antennas are also nice. The lucent are available in three gains 20, 26, 40 dB version. Most are the 26dB version and are a great product. Placement can be important, and although you could use indoors it will perform best as low as possible with a full view of the sky. (Low to avoid terrestrial interference). Thomas Knox Date: Tue, 17 Jul 2012 00:50:02 +0200 From: azelio.bori...@screen.it To: time-nuts@febo.com Subject: Re: [time-nuts] XL-DC Antenna Requirements The XL-DC is a 6 channels receiver, so no other benefit other than a greater probability to see constantly 6 satellites is gained from 24 to 32 satellites constellation. On Mon, Jul 16, 2012 at 11:59 PM, Chris Hoffman cq.k...@gmail.com wrote: All, Though somewhat outmoded, looking forward to starting my own time shop with two XL-DC controllers that I have been lucky enough to pick up recently. My question: Do I really need to invest in the likes of the HP 58532A antennae, or will my surplus Trimble magnetic antennae -- magnetically attached to a random ferrous backplane -- do? I guess what I am really asking: what are the relevant antenna design requirements here, and does the advent of as 32-satellite-constellation have any effect upon the antenna choice (i.e. design downgrade) for the TrueTime XL-DC? -CH Chris Hoffman cq.k...@gmail.com http://ar.ctur.us -CH Chris Hoffman cq.k...@gmail.com http://ar.ctur.us ___ 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. -- Message: 2 Date: Mon, 16 Jul 2012 18:02:49 -0700 From: Bob Martin k6...@comcast.net To: time-nuts@febo.com Subject: Re: [time-nuts] XL-DC Antenna Requirements Message-ID: 8dbef16d-ce19-4088-9347-458c02a53...@comcast.net Content-Type: text/plain;charset=us-ascii Chris-- The 58532A is somewhat higher gain (30dBi or better) than most mag-mount antennas (26dBi typ IIRC). The pointy nature of the 58532A also serves as an avian deterrent, reducing the accumulation of attenuating deposits... Running two receivers, I would highly recommend a real GPS distribution amp such as the 58535A. Such a beast will let you run both receivers from one antenna, while providing isolation between the receivers. I just happen to have one handy, having recently pulled it out of service and replaced it with a 4-port model to better support my time-nuttiness. Contact me off list if you would be interested. 73 Bob k6...@arrl.net On Jul 16, 2012, at 16:01,
Re: [time-nuts] time-nuts Digest, Vol 96, Issue 70
Yes, I agree, it is not an antenna gain problem... it is better to find a way to draw the constellation like LH for the TBolt. This way you can find out if the antenna is free or not from obstructions. On Tue, Jul 17, 2012 at 5:25 PM, Bob Camp li...@rtty.us wrote: Hi The antenna gain is likely *plenty* for that short a run of coax. Bob -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Chris Hoffman, KG6O Sent: Tuesday, July 17, 2012 11:16 AM To: time-nuts@febo.com Subject: Re: [time-nuts] time-nuts Digest, Vol 96, Issue 70 Wow! Great info. The 5v mag mount antennae are working, but the receivers are cycling between 2-D and 3-D (5 or 6-bird) modes. With the 26dB trimbles, I suspect I'm loosing ~5db in the 30ft of crumby RG-5, and a little pattern with my rain-gutter backplane. I don't have too much arial obstruction, but that's no excuse from overkill: I'll be on the lookout for 26- or 40[?!?]-dB cones. Does anyone have a Lucent part number available? -CH On Jul 17, 2012, at 5:00, time-nuts-requ...@febo.com wrote: Send time-nuts mailing list submissions to time-nuts@febo.com To subscribe or unsubscribe via the World Wide Web, visit https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts or, via email, send a message with subject or body 'help' to time-nuts-requ...@febo.com You can reach the person managing the list at time-nuts-ow...@febo.com When replying, please edit your Subject line so it is more specific than Re: Contents of time-nuts digest... Today's Topics: 1. Re: XL-DC Antenna Requirements (Tom Knox) 2. Re: XL-DC Antenna Requirements (Bob Martin) -- Message: 1 Date: Mon, 16 Jul 2012 18:11:59 -0600 From: Tom Knox act...@hotmail.com To: Time-Nuts time-nuts@febo.com Subject: Re: [time-nuts] XL-DC Antenna Requirements Message-ID: bay162-w4046e629af83f1d3bded81df...@phx.gbl Content-Type: text/plain; charset=iso-8859-1 Hi Chris; There were a number of XL-DC produced with 12vdc antenna power and should be marked near the connector. There are also some marked Down converter required. Other then then those the 58532A is a great choice andf sold under a number of names such as VIC-100, the Lucent antennas are also nice. The lucent are available in three gains 20, 26, 40 dB version. Most are the 26dB version and are a great product. Placement can be important, and although you could use indoors it will perform best as low as possible with a full view of the sky. (Low to avoid terrestrial interference). Thomas Knox Date: Tue, 17 Jul 2012 00:50:02 +0200 From: azelio.bori...@screen.it To: time-nuts@febo.com Subject: Re: [time-nuts] XL-DC Antenna Requirements The XL-DC is a 6 channels receiver, so no other benefit other than a greater probability to see constantly 6 satellites is gained from 24 to 32 satellites constellation. On Mon, Jul 16, 2012 at 11:59 PM, Chris Hoffman cq.k...@gmail.com wrote: All, Though somewhat outmoded, looking forward to starting my own time shop with two XL-DC controllers that I have been lucky enough to pick up recently. My question: Do I really need to invest in the likes of the HP 58532A antennae, or will my surplus Trimble magnetic antennae -- magnetically attached to a random ferrous backplane -- do? I guess what I am really asking: what are the relevant antenna design requirements here, and does the advent of as 32-satellite-constellation have any effect upon the antenna choice (i.e. design downgrade) for the TrueTime XL-DC? -CH Chris Hoffman cq.k...@gmail.com http://ar.ctur.us -CH Chris Hoffman cq.k...@gmail.com http://ar.ctur.us ___ 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. -- Message: 2 Date: Mon, 16 Jul 2012 18:02:49 -0700 From: Bob Martin k6...@comcast.net To: time-nuts@febo.com Subject: Re: [time-nuts] XL-DC Antenna Requirements Message-ID: 8dbef16d-ce19-4088-9347-458c02a53...@comcast.net Content-Type: text/plain;charset=us-ascii Chris-- The 58532A is somewhat higher gain (30dBi or better) than most mag-mount antennas (26dBi typ IIRC). The pointy nature of the 58532A also serves as an avian deterrent, reducing the accumulation of attenuating deposits... Running two receivers, I would highly recommend a real GPS distribution amp such as the 58535A. Such a beast will let you run
[time-nuts] Timing Health Monitoring
What advice does anyone have on building/finding cheap [visual?] comparison devices to display or detect a timing [lesajo?] from my 10MHz sine wave ports? Further, what timing/health metrics could/should I be aware of and/or looking for? I do not want to spend good money on another oscillicope if I can help it, but I do want to see, or at least be remotely aware of clock slips/walks and other anomalies. I am thinking about building an embedded system to automate monitoring, configuration, and alerts... perhaps using an Arduino. -CH ___ 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] Timing Health Monitoring
The first step is: use any dual trace oscilloscope and put on channel 1 the first 10MHz source and on channel 2 the other. Trigger from channel 1 and see if and at what speed (cycles/second) the other channel walks. On Tue, Jul 17, 2012 at 6:09 PM, Chris Hoffman, KG6O cq.k...@gmail.comwrote: What advice does anyone have on building/finding cheap [visual?] comparison devices to display or detect a timing [lesajo?] from my 10MHz sine wave ports? Further, what timing/health metrics could/should I be aware of and/or looking for? I do not want to spend good money on another oscillicope if I can help it, but I do want to see, or at least be remotely aware of clock slips/walks and other anomalies. I am thinking about building an embedded system to automate monitoring, configuration, and alerts... perhaps using an Arduino. -CH ___ 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] Timing Health Monitoring
Of course the dual trace scope will do this. But the OP asks for something cheaper. I think you can do the same thing as the scope with a mixer. Mix the reference and unknown 10Mhz signals then use a low pass filter. The output is the beat which if everything is perfect is a DC voltage. But in a real world is a slow moving AC signal. Then visually you can drive an analog volt meter and watch the needle move to not move. You can build a diode ring mixer for cheap or buy an SA612 chip for a few bucks On Tue, Jul 17, 2012 at 9:18 AM, Azelio Boriani azelio.bori...@screen.it wrote: The first step is: use any dual trace oscilloscope and put on channel 1 the first 10MHz source and on channel 2 the other. Trigger from channel 1 and see if and at what speed (cycles/second) the other channel walks. On Tue, Jul 17, 2012 at 6:09 PM, Chris Hoffman, KG6O cq.k...@gmail.comwrote: What advice does anyone have on building/finding cheap [visual?] comparison devices to display or detect a timing [lesajo?] from my 10MHz sine wave ports? Further, what timing/health metrics could/should I be aware of and/or looking for? I do not want to spend good money on another oscillicope if I can help it, but I do want to see, or at least be remotely aware of clock slips/walks and other anomalies. I am thinking about building an embedded system to automate monitoring, configuration, and alerts... perhaps using an Arduino. -CH ___ 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. -- Chris Albertson Redondo Beach, California ___ 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] Timing Health Monitoring
Hi A dual input counter is probably your best tool. Something like a 5335 or 5334 would be reasonably cheap. Maybe compare edge crossing time to a pps. Mux all of your outputs and compare them one at a time. You will have data resolution at 1x10^-12 in under a day. For time slips (as in dropped cycles) you likely would want to divide them all down to 1 pps (or less) and compare there. Of course that all makes a lot of assumptions about what you need to do. Bob -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Chris Hoffman, KG6O Sent: Tuesday, July 17, 2012 12:10 PM To: time-nuts@febo.com Subject: [time-nuts] Timing Health Monitoring What advice does anyone have on building/finding cheap [visual?] comparison devices to display or detect a timing [lesajo?] from my 10MHz sine wave ports? Further, what timing/health metrics could/should I be aware of and/or looking for? I do not want to spend good money on another oscillicope if I can help it, but I do want to see, or at least be remotely aware of clock slips/walks and other anomalies. I am thinking about building an embedded system to automate monitoring, configuration, and alerts... perhaps using an Arduino. -CH ___ 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] Orbital time-delayed angular momentum phasing....???!!
Timenutters-- Along the lines of splitting time into small increments, there is an interesting article in the May 2012 issue of the IEEE Spectrum Journal. It describes experiments with what I am calling cork-screw time-shift phasing modulation or orbital time-delayed angular momentum phasing for lack of a better description of the process. This is not the same as circular-polarization of a radiated signal. Visualize a 4-ft dia parabolic reflector which has been cut (sliced) in a straight line from any arbitrary point on its outer edge to its center.Then, at the outer lip of the reflector surface, pull one side of the cut about a foot forward of the other side of the cut. The separation is greatest at the edge of the dish, gradually becoming less and less as the cut approaches the center of the dish. The concept is that RF energy from the feed progressively strikes different areas of the dish slightly ahead (time-wise) from RF energy that strikes other parts of the dish. Because the surface of the dish resembles a cork-screw the signal from the dish has elements that are time-delayed with respect to other parts. Accordingly, data elements can be incorporated into the signal which have sightly different time-delay angular momentum properties. Again, the folks working on this insist that this is not the same as circular polarity of the radiated signal such as is obtained with a helix antenna. At the receive end, the process is reversed, producing a signal which when demodulated can contain extra levels of data modulation superimposed on it. The article points out that there are skeptics of the process who say that this same modulation procedure can be done with other methods although the modulation and demodulation process would be much more complex. The orbital angular momentum of photons in the optical realm has been extensively studied, although applying these principles to RF is something new. Mike Baker -- ___ 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] Orbital time-delayed angular momentum phasing....???!!
To exploit an angular momentum modulation we need a demodulator able to recognize that angular momentum... nowadays our demodulators cannot go beyond amplitude, phase and their combination. Maybe I'm missing something... On Tue, Jul 17, 2012 at 6:59 PM, Michael Baker mp...@clanbaker.org wrote: Timenutters-- Along the lines of splitting time into small increments, there is an interesting article in the May 2012 issue of the IEEE Spectrum Journal. It describes experiments with what I am calling cork-screw time-shift phasing modulation or orbital time-delayed angular momentum phasing for lack of a better description of the process. This is not the same as circular-polarization of a radiated signal. Visualize a 4-ft dia parabolic reflector which has been cut (sliced) in a straight line from any arbitrary point on its outer edge to its center.Then, at the outer lip of the reflector surface, pull one side of the cut about a foot forward of the other side of the cut. The separation is greatest at the edge of the dish, gradually becoming less and less as the cut approaches the center of the dish. The concept is that RF energy from the feed progressively strikes different areas of the dish slightly ahead (time-wise) from RF energy that strikes other parts of the dish. Because the surface of the dish resembles a cork-screw the signal from the dish has elements that are time-delayed with respect to other parts. Accordingly, data elements can be incorporated into the signal which have sightly different time-delay angular momentum properties. Again, the folks working on this insist that this is not the same as circular polarity of the radiated signal such as is obtained with a helix antenna. At the receive end, the process is reversed, producing a signal which when demodulated can contain extra levels of data modulation superimposed on it. The article points out that there are skeptics of the process who say that this same modulation procedure can be done with other methods although the modulation and demodulation process would be much more complex. The orbital angular momentum of photons in the optical realm has been extensively studied, although applying these principles to RF is something new. Mike Baker -- ___ 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] Timing Health Monitoring
Mr. Sproul: I really like your solution! Do you mind emailing me code and schematics? Bob, you right: I should be watching slips with a PPS-actuated buffer. For now, I don't have the resources for a ready-made dual-input counter, but the strangest/best things seem to show up at the flea market when I'm least expecting them ;) For now, I will be conducting research on integrating a rudimentary counter on top of Mr. Sproul's design. Chris: It should be no issue to take your comparator and 'tape' an A/D pin to it for digital monitoring, either (I'm not sure how Bob's design is implemented, but it appears roughly equivalent). Do you have any examples I should be looking for? -CH Chris Hoffman cq.k...@gmail.com http://ar.ctur.us On Jul 17, 2012, at 11:51 AM, MSproul wrote: On Jul 17, 2012, at 11:09 AM, Chris Hoffman, KG6O wrote: What advice does anyone have on building/finding cheap [visual?] comparison devices to display or detect a timing [lesajo?] from my 10MHz sine wave ports? I am thinking about building an embedded system to automate monitoring, configuration, and alerts... perhaps using an Arduino. -CH__ Hi Chris I am doing what you are asking about. I have built a Frequency Comparator that compare two10 MHz square waves but would probably work with sine waves. I am using a Digilent. Inc. chipKIT Uno32. http://digilentinc.com/Products/Detail.cfm?NavPath=2,892,893Prod=CHIPKIT-UNO32. This board is comparable to the Arduino and most of the shields for the Arduino will work with the chipKIT. To program the chipKIT requires the Mpide program from Digilent. The program is free (from the above site) AND will program both the Arduino and chipKIT, just select the proper option. No change in source code is required to compile for the Arduino or chipKIT. The program looks just like the one from Arduino. The attached photo shows the display of my comparator. The first line is the name of the source code The second line is error between reference and Device under Test and whether the DUT is high or low The third line is current time between cycle slips The fourth line is the current error and is continually updated during a cycle slip The LEDs at the top give a visual presentation of the cycle slips: Left-moving - DUT is LOW., right-moving - the DUT is HIGH The hardware only requires 6 ICs plus LEDs and a few passive parts. The program is not finished yet. I still have to do some long-term testing and some minor 'tweaking but does what I want. It is very interesting to watch an oscillator from a cold start. The lights will race one direction, slow down, stop, then race the other direction until it finally slows down and stops. M. L. Sproul, W5UGQ Amarillo, TX mspr...@suddenlink.net FreqComp.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] Orbital time-delayed angular momentum phasing....???!!
Are we sure it wasn't the April issue? Isn't this just phase modulation? Azelio Boriani To exploit an angular momentum modulation we need a demodulator able to recognize that angular momentum... nowadays our demodulators cannot go beyond amplitude, phase and their combination. Maybe I'm missing something... On Tue, Jul 17, 2012 at 6:59 PM, Michael Baker mp...@clanbaker.org wrote: Timenutters-- Along the lines of splitting time into small increments, there is an interesting article in the May 2012 issue of the IEEE Spectrum Journal. It describes experiments with what I am calling cork-screw time-shift phasing modulation or orbital time-delayed angular momentum phasing for lack of a better description of the process. This is not the same as circular-polarization of a radiated signal. Visualize a 4-ft dia parabolic reflector which has been cut (sliced) in a straight line from any arbitrary point on its outer edge to its center.Then, at the outer lip of the reflector surface, pull one side of the cut about a foot forward of the other side of the cut. The separation is greatest at the edge of the dish, gradually becoming less and less as the cut approaches the center of the dish. The concept is that RF energy from the feed progressively strikes different areas of the dish slightly ahead (time-wise) from RF energy that strikes other parts of the dish. Because the surface of the dish resembles a cork-screw the signal from the dish has elements that are time-delayed with respect to other parts. Accordingly, data elements can be incorporated into the signal which have sightly different time-delay angular momentum properties. Again, the folks working on this insist that this is not the same as circular polarity of the radiated signal such as is obtained with a helix antenna. At the receive end, the process is reversed, producing a signal which when demodulated can contain extra levels of data modulation superimposed on it. The article points out that there are skeptics of the process who say that this same modulation procedure can be done with other methods although the modulation and demodulation process would be much more complex. The orbital angular momentum of photons in the optical realm has been extensively studied, although applying these principles to RF is something new. Mike Baker -- ___ 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. -- Neither the voice of authority nor the weight of reason and argument are as significant as experiment, for thence comes quiet to the mind. R. Bacon If you don't know what it is, don't poke it. Ghost in the Shell Dr. Don Latham AJ7LL Six Mile Systems LLP 17850 Six Mile Road POB 134 Huson, MT, 59846 VOX 406-626-4304 www.lightningforensics.com www.sixmilesystems.com ___ 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] Orbital time-delayed angular momentum phasing....???!!
Maybe: the experiment was made in March... Anyway, as usual, first I commented and then read the article and, yes, I was missing something but it is not so clear IMO. They say to have used 2 Yagi antennas at the receiver side and 1 Yagi and 1 modified parabolic dish at the transmitter. Then by measuring the phase you can separate the two signals. The phase of what is not clear: the carrier? The data? Why phase? The angular momentum translates in a phase rotation? Like adding some delay? Here another experiment with light: http://www.nature.com/nphoton/journal/v6/n7/full/nphoton.2012.138.html On Tue, Jul 17, 2012 at 9:44 PM, Don Latham d...@montana.com wrote: Are we sure it wasn't the April issue? Isn't this just phase modulation? Azelio Boriani To exploit an angular momentum modulation we need a demodulator able to recognize that angular momentum... nowadays our demodulators cannot go beyond amplitude, phase and their combination. Maybe I'm missing something... On Tue, Jul 17, 2012 at 6:59 PM, Michael Baker mp...@clanbaker.org wrote: Timenutters-- Along the lines of splitting time into small increments, there is an interesting article in the May 2012 issue of the IEEE Spectrum Journal. It describes experiments with what I am calling cork-screw time-shift phasing modulation or orbital time-delayed angular momentum phasing for lack of a better description of the process. This is not the same as circular-polarization of a radiated signal. Visualize a 4-ft dia parabolic reflector which has been cut (sliced) in a straight line from any arbitrary point on its outer edge to its center.Then, at the outer lip of the reflector surface, pull one side of the cut about a foot forward of the other side of the cut. The separation is greatest at the edge of the dish, gradually becoming less and less as the cut approaches the center of the dish. The concept is that RF energy from the feed progressively strikes different areas of the dish slightly ahead (time-wise) from RF energy that strikes other parts of the dish. Because the surface of the dish resembles a cork-screw the signal from the dish has elements that are time-delayed with respect to other parts. Accordingly, data elements can be incorporated into the signal which have sightly different time-delay angular momentum properties. Again, the folks working on this insist that this is not the same as circular polarity of the radiated signal such as is obtained with a helix antenna. At the receive end, the process is reversed, producing a signal which when demodulated can contain extra levels of data modulation superimposed on it. The article points out that there are skeptics of the process who say that this same modulation procedure can be done with other methods although the modulation and demodulation process would be much more complex. The orbital angular momentum of photons in the optical realm has been extensively studied, although applying these principles to RF is something new. Mike Baker -- ___ 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. -- Neither the voice of authority nor the weight of reason and argument are as significant as experiment, for thence comes quiet to the mind. R. Bacon If you don't know what it is, don't poke it. Ghost in the Shell Dr. Don Latham AJ7LL Six Mile Systems LLP 17850 Six Mile Road POB 134 Huson, MT, 59846 VOX 406-626-4304 www.lightningforensics.com www.sixmilesystems.com ___ 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] Orbital time-delayed angular momentum phasing....???!!
On 07/17/2012 11:32 PM, Azelio Boriani wrote: Maybe: the experiment was made in March... Anyway, as usual, first I commented and then read the article and, yes, I was missing something but it is not so clear IMO. They say to have used 2 Yagi antennas at the receiver side and 1 Yagi and 1 modified parabolic dish at the transmitter. Then by measuring the phase you can separate the two signals. The phase of what is not clear: the carrier? The data? Why phase? The angular momentum translates in a phase rotation? Like adding some delay? Here another experiment with light: http://www.nature.com/nphoton/journal/v6/n7/full/nphoton.2012.138.html If you look it up on Wikipedia you find some more: http://en.wikipedia.org/wiki/Orbital_angular_momentum_of_light Anyway, this is heading of into the vast fields of off-topicness. 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.
