Re: [time-nuts] Possible replacement for FE5680A
Yes, build three and compare them but your comparator has to have a very low noise floor. I think that in addition to building new higher precision clocks you need to build new lower noise TI counters. On Sun, Mar 11, 2012 at 1:10 AM, Jim Lux jim...@earthlink.net wrote: On 3/10/12 2:42 PM, Azelio Boriani wrote: Amazing, 10 at -19... will it ever be measurable? build three and compare them? __**_ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/** mailman/listinfo/time-nutshttps://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] Three HP oldies
Lovely stuff!! Rob -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Pete Lancashire Sent: 11 March 2012 17:56 To: Discussion of precise time and frequency measurement Subject: [time-nuts] Three HP oldies 101A https://plus.google.com/u/0/photos/111617808980322733757/albums/571869450289 0226481 115CR https://plus.google.com/u/0/photos/111617808980322733757/albums/571869789245 1866241 116AR https://plus.google.com/u/0/photos/111617808980322733757/albums/571869946252 1152657 ___ 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] Austron 1201A
Hi Joe, Just found this link:- http://home.catv.ne.jp/ff/y226/1/1-12/PhaseCompalator/sub1-12-PhaseComparato r.htm#1201B 1201A B similar. I think it was only cosmetic changes. Hope useful. Rob -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Joseph Gray Sent: 12 March 2012 01:51 To: Discussion of precise time and frequency measurement Subject: [time-nuts] Austron 1201A Is an Austron 1201A of any use? I may be able to get one. What is a rational price? How difficult is it to get an analog output, so I don't have to use the chart recorder? I didn't see any output connectors on it. Any chance of documentation? Googling found nothing. Joe Gray W5JG ___ 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] Possible replacement for FE5680A
On 3/12/12 2:20 AM, Azelio Boriani wrote: Yes, build three and compare them but your comparator has to have a very low noise floor. I think that in addition to building new higher precision clocks you need to build new lower noise TI counters. This is part of the thrill (or frustration) of working at the state of the art limit. At work we build state of the art deep space transponders with very low added Allan deviation (4E-16 at 1000 sec). Figuring out a way to prove that they work is often harder than designing and building the actual article under test, particularly when you want to demonstrate that it will do it with a slowly varying input frequency. ___ 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] Three HP oldies
I'll second that Rob! I have the HP 115BR and, what I believe to be a British version made for the Royal Navy by McMichael. Pictured here: http://www.flickr.com/photos/75ohm/6829984174/ and here http://www.flickr.com/photos/75ohm/6976111697/ Called a 'Clock Direct Reading' carrying NSN 6645-99-972-5270 this incredibly well made device requires a 100KHz input which is divided to 1KHz. This powers a Muirhead motor with an armature speed of 10,000 RPM. This is then geared down to drive a mechanical digital readout. The display can be advanced or retarded using a handwheel which operates a differential gear in the drivetrain. There is a 'pips' output which is 100mS of 1KHz every second. I would be most interested to hear from anyone with information about this device, how and where it was used, circuitry etc. John Howell (in the UK). On 12 Mar 2012, at 10:36, Rob Kimberley wrote: Lovely stuff!! Rob -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Pete Lancashire Sent: 11 March 2012 17:56 To: Discussion of precise time and frequency measurement Subject: [time-nuts] Three HP oldies 101A https://plus.google.com/u/0/photos/111617808980322733757/albums/571869450289 0226481 115CR https://plus.google.com/u/0/photos/111617808980322733757/albums/571869789245 1866241 116AR https://plus.google.com/u/0/photos/111617808980322733757/albums/571869946252 1152657 ___ 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] Three HP oldies
Other then the damage to the 1 rev per second wheel it looks like will not take much to clean up. My corrent idea is to start off with making a replacement on a laser printer and once I'm comfortable with how it looks have a few scales made on photographic paper. One discount retailer here in the US, Costco will do 8x10 prints from .jpg files for $1.50 USD each. Cheap enough to experiment. The 116AR although totally impractical will still be fun to bring back to life, but will be some time. Will need to find a manual first. -pete On Mon, Mar 12, 2012 at 9:20 AM, John Howell j...@howell61.f9.co.uk wrote: I'll second that Rob! I have the HP 115BR and, what I believe to be a British version made for the Royal Navy by McMichael. Pictured here: http://www.flickr.com/photos/75ohm/6829984174/ and here http://www.flickr.com/photos/75ohm/6976111697/ Called a 'Clock Direct Reading' carrying NSN 6645-99-972-5270 this incredibly well made device requires a 100KHz input which is divided to 1KHz. This powers a Muirhead motor with an armature speed of 10,000 RPM. This is then geared down to drive a mechanical digital readout. The display can be advanced or retarded using a handwheel which operates a differential gear in the drivetrain. There is a 'pips' output which is 100mS of 1KHz every second. I would be most interested to hear from anyone with information about this device, how and where it was used, circuitry etc. John Howell (in the UK). On 12 Mar 2012, at 10:36, Rob Kimberley wrote: Lovely stuff!! Rob -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Pete Lancashire Sent: 11 March 2012 17:56 To: Discussion of precise time and frequency measurement Subject: [time-nuts] Three HP oldies 101A https://plus.google.com/u/0/photos/111617808980322733757/albums/571869450289 0226481 115CR https://plus.google.com/u/0/photos/111617808980322733757/albums/571869789245 1866241 116AR https://plus.google.com/u/0/photos/111617808980322733757/albums/571869946252 1152657 ___ 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] Three HP oldies
Just a note about jpg files, they are intentionally fuzzed as the Japanese Photo Experts Group concept is in the interest of visual art. So if you make a jpg of a schematic much of it will not be readable. Try Graphics Interchange Format gif to preserve computer generated details like lines and text. Or if it is all text, the postscript file system is very good, it allows control of the entire page formatting in preservation of accurate alignments. I have made a similar repair using clear sheets made for overhead projectors. My bet is that the photographic paper wont buy you very much improvement if any. A laser printer with 600 dpi is a very good graphics machine. If you want to try the mylar paper send me the file and a mail address to return to. There is also an option to use a material similar to photo paper for laser printing, my guess is that that is what the print shops are using to make photographic prints so they are laser images not photo images made from laser images. Greg On 3/12/2012 11:43 AM, Pete Lancashire wrote: Other then the damage to the 1 rev per second wheel it looks like will not take much to clean up. My corrent idea is to start off with making a replacement on a laser printer and once I'm comfortable with how it looks have a few scales made on photographic paper. One discount retailer here in the US, Costco will do 8x10 prints from .jpg files for $1.50 USD each. Cheap enough to experiment. The 116AR although totally impractical will still be fun to bring back to life, but will be some time. Will need to find a manual first. -pete ___ 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] Three HP oldies
Just a note about jpg files, they are intentionally fuzzed as the Japanese Photo Experts Group concept is in the interest of visual art. s/Japanese/Joint/ So if you make a jpg of a schematic much of it will not be readable. Try Graphics Interchange Format gif to preserve computer generated details like lines and text. Or if it is all text, the postscript file system is very good, it allows control of the entire page formatting in preservation of accurate alignments. [] Greg Actually, there is a lossless version of JPEG but it is little used. PNG is a much better choice for graphics than GIF as it allows more than 256 colours. PNG has lossless compression. Cheers, David -- SatSignal software - quality software written to your requirements Web: http://www.satsignal.eu Email: david-tay...@blueyonder.co.uk ___ 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] Three HP oldies
In message 4f5e2d68.4010...@comcast.net, Greg Broburg writes: Just a note about jpg files, they are intentionally fuzzed as the Japanese Photo Experts Group concept is in the interest of visual art. So if you make a jpg of a schematic much of it will not be readable. Try Graphics Interchange Format gif to preserve computer generated details like lines and text. PNG is also a good choice, both for pictures and for graphics. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. ___ 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] Possible replacement for FE5680A
This is very interesting: I think you have a precision local clock source to accept a slowly varying input frequency and clean it for the transmission so that it is the clock source that ultimately dominates the output stability. On Mon, Mar 12, 2012 at 2:24 PM, Jim Lux jim...@earthlink.net wrote: On 3/12/12 2:20 AM, Azelio Boriani wrote: Yes, build three and compare them but your comparator has to have a very low noise floor. I think that in addition to building new higher precision clocks you need to build new lower noise TI counters. This is part of the thrill (or frustration) of working at the state of the art limit. At work we build state of the art deep space transponders with very low added Allan deviation (4E-16 at 1000 sec). Figuring out a way to prove that they work is often harder than designing and building the actual article under test, particularly when you want to demonstrate that it will do it with a slowly varying input frequency. __**_ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/** mailman/listinfo/time-nutshttps://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] Three HP oldies
A minor nit... It's Joint Photographic Experts Group -- not Japanese. Designed __specifically__ for continuous tone color photographs. It was never intended for line drawings and will fail miserably with them. http://en.wikipedia.org/wiki/JPEG My local Costco can also handle TIFF files which is a lossless format and perfect (as well as GIF) for line drawings. http://en.wikipedia.org/wiki/Tagged_Image_File_Format You can also buy self-adhesive full-page stickers from your local office supply store. Use your laser to print the panel, apply the label and then overcoat with a matte spray varnish. Dave -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Greg Broburg Sent: Monday, March 12, 2012 10:08 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Three HP oldies Just a note about jpg files, they are intentionally fuzzed as the Japanese Photo Experts Group concept is in the interest of visual art. So if you make a jpg of a schematic much of it will not be readable. Try Graphics Interchange Format gif to preserve computer generated details like lines and text. Or if it is all text, the postscript file system is very good, it allows control of the entire page formatting in preservation of accurate alignments. I have made a similar repair using clear sheets made for overhead projectors. My bet is that the photographic paper wont buy you very much improvement if any. A laser printer with 600 dpi is a very good graphics machine. If you want to try the mylar paper send me the file and a mail address to return to. There is also an option to use a material similar to photo paper for laser printing, my guess is that that is what the print shops are using to make photographic prints so they are laser images not photo images made from laser images. Greg On 3/12/2012 11:43 AM, Pete Lancashire wrote: Other then the damage to the 1 rev per second wheel it looks like will not take much to clean up. My corrent idea is to start off with making a replacement on a laser printer and once I'm comfortable with how it looks have a few scales made on photographic paper. One discount retailer here in the US, Costco will do 8x10 prints from .jpg files for $1.50 USD each. Cheap enough to experiment. The 116AR although totally impractical will still be fun to bring back to life, but will be some time. Will need to find a manual first. -pete ___ 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] Three HP oldies
semif...@comcast.net said: Or if it is all text, the postscript file system is very good, it allows control of the entire page formatting in preservation of accurate alignments. Postscript also does lines and circles and ... Usually it gets (much) better results with text than you get from gif/jpg when they are targeted for screen resolution. A laser printer with 600 dpi is a very good graphics machine Keep in mind that the scale factor may be a bit off. If you draw a 1 inch line, it might be slightly more or less than an inch. It's easy to scale postscript. My linux system has a psresize command. (I haven't tried it, at least not recently.) With a bit of trial and error, you can get a very accurate result. I used to print gerber layers for PCBs on mylar. If you were doing mechanical checks, it was worth the effort to get the scale right. (Maybe we just had a crappy printer.) If you like low level hacking, you can write raw postscript by hand for simple things. I have the first 3 postscript books from many years ago. I pull them out every few years. -- These are my opinions, not necessarily my employer's. I hate spam. ___ 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] Three HP oldies
Do I know !! I've only been able to convince one Costco that the equipment they have can take tiff's and a few other formats. The other is to get them not to crop. When critical there are other shops but the price per print is much more. I guess consumer vs commercial customer and volume. On Mon, Mar 12, 2012 at 10:13 AM, David J Taylor david-tay...@blueyonder.co.uk wrote: Just a note about jpg files, they are intentionally fuzzed as the Japanese Photo Experts Group concept is in the interest of visual art. s/Japanese/Joint/ So if you make a jpg of a schematic much of it will not be readable. Try Graphics Interchange Format gif to preserve computer generated details like lines and text. Or if it is all text, the postscript file system is very good, it allows control of the entire page formatting in preservation of accurate alignments. [] Greg Actually, there is a lossless version of JPEG but it is little used. PNG is a much better choice for graphics than GIF as it allows more than 256 colours. PNG has lossless compression. Cheers, David -- SatSignal software - quality software written to your requirements Web: http://www.satsignal.eu Email: david-tay...@blueyonder.co.uk ___ 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] Three HP oldies
Comments gif is much better than jpg It is normal to calibrate the print driver so that the accuracy is very good. If you put a ruler up on a printed 1 inch line and see that it is significantly off then the driver needs to be calibrated. Greg On 3/12/2012 1:23 PM, Hal Murray wrote: semif...@comcast.net said: Or if it is all text, the postscript file system is very good, it allows control of the entire page formatting in preservation of accurate alignments. Postscript also does lines and circles and ... Usually it gets (much) better results with text than you get from gif/jpg when they are targeted for screen resolution. A laser printer with 600 dpi is a very good graphics machine Keep in mind that the scale factor may be a bit off. If you draw a 1 inch line, it might be slightly more or less than an inch. It's easy to scale postscript. My linux system has a psresize command. (I haven't tried it, at least not recently.) With a bit of trial and error, you can get a very accurate result. I used to print gerber layers for PCBs on mylar. If you were doing mechanical checks, it was worth the effort to get the scale right. (Maybe we just had a crappy printer.) If you like low level hacking, you can write raw postscript by hand for simple things. I have the first 3 postscript books from many years ago. I pull them out every few years. ___ 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] 0MHz distribution...NOT
On 03/10/2012 04:44 PM, Mark Spencer wrote: I've done this as well. I daisy chained several pieces of hp and marconi gear together that all had an approx 1k ohm input impedance for the frequency reference and fed them from a single 10 Mhz source via t connectors with a 50 ohm terminator at the end of the line. Looking at the signal with either a scope or a time interval counter I have seen noticeable phase shifts when some of the equipment receiving this signal is turned off or on. That being said so long as the equipment was not turned off or on the adev of the signal was as expected. Your mileage may vary. Sent from my iPad On 2012-03-10, at 4:24 PM, Michael Blazermbla...@satx.rr.com wrote: You may want to take a look at the signal on a scope. Most instruments terminate their reference input. You might actually have 4 50 ohm loads on the Thunderbolt's output and the input voltage might be marginal. If your instruments have both reference input and output, it's better to daisy chain the units. On 3/10/2012 5:10 PM, Chuck Forsberg WA7KGX N2469R wrote: A month or two ago I had sketched out a simple distribution amp for my 10 MHz reference. In the meantime I became somewhat disillusioned about my FE-5680a standards. So I removed the FE-5680a and disconnected its power supply from the box that holds the Thunderbolt, power supply, and big line filter. I decided to try daisy-chaining the Thunderbolt's 10 MHz output. I have plenty of hardware left over from the days of 10BaseT networking. So I have the Thunderbolt going to a BNC T on the back of my FlexRadio 1500, hence to my Advantest U3641 spectrum analyzer, and finally to the external reference on my Racal-Dana 1992 nanosecond universal counter. That end has a 50 ohm termination on the other side of its T connector. All three devices seem happy with the 10 MHz they are receiving. I connected my Tek 2712 to the end of the chain. It reads +10dbm +-1db. Switching units on/off/ext ref causes less than 1db change in the 10 MHz. -- Chuck Forsberg WA7KGX N2469R c...@omen.com www.omen.com Developer of Industrial ZMODEM(Tm) for Embedded Applications Omen Technology Inc The High Reliability Software 10255 NW Old Cornelius Pass Portland OR 97231 503-614-0430 ___ 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] 0MHz distribution...NOT
What, if any, are the phase changes? On Mon, Mar 12, 2012 at 5:39 PM, Chuck Forsberg WA7KGX N2469R c...@omen.comwrote: On 03/10/2012 04:44 PM, Mark Spencer wrote: I've done this as well. I daisy chained several pieces of hp and marconi gear together that all had an approx 1k ohm input impedance for the frequency reference and fed them from a single 10 Mhz source via t connectors with a 50 ohm terminator at the end of the line. Looking at the signal with either a scope or a time interval counter I have seen noticeable phase shifts when some of the equipment receiving this signal is turned off or on. That being said so long as the equipment was not turned off or on the adev of the signal was as expected. Your mileage may vary. Sent from my iPad On 2012-03-10, at 4:24 PM, Michael Blazermbla...@satx.rr.com wrote: You may want to take a look at the signal on a scope. Most instruments terminate their reference input. You might actually have 4 50 ohm loads on the Thunderbolt's output and the input voltage might be marginal. If your instruments have both reference input and output, it's better to daisy chain the units. On 3/10/2012 5:10 PM, Chuck Forsberg WA7KGX N2469R wrote: A month or two ago I had sketched out a simple distribution amp for my 10 MHz reference. In the meantime I became somewhat disillusioned about my FE-5680a standards. So I removed the FE-5680a and disconnected its power supply from the box that holds the Thunderbolt, power supply, and big line filter. I decided to try daisy-chaining the Thunderbolt's 10 MHz output. I have plenty of hardware left over from the days of 10BaseT networking. So I have the Thunderbolt going to a BNC T on the back of my FlexRadio 1500, hence to my Advantest U3641 spectrum analyzer, and finally to the external reference on my Racal-Dana 1992 nanosecond universal counter. That end has a 50 ohm termination on the other side of its T connector. All three devices seem happy with the 10 MHz they are receiving. I connected my Tek 2712 to the end of the chain. It reads +10dbm +-1db. Switching units on/off/ext ref causes less than 1db change in the 10 MHz. -- Chuck Forsberg WA7KGX N2469R c...@omen.com www.omen.com Developer of Industrial ZMODEM(Tm) for Embedded Applications Omen Technology Inc The High Reliability Software 10255 NW Old Cornelius Pass Portland OR 97231 503-614-0430 __**_ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/** mailman/listinfo/time-nutshttps://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] 0MHz distribution...NOT
Also the effect was not observed when the same gpsdo was fed directly into the 5370 and the same equipment was power cycled. Sorry it's been long day wrestling with network clocking issues at the office (: Sent from my iPod On 2012-03-12, at 7:37 PM, Mark Spencer mspencer12...@yahoo.ca wrote: The attached file should give you an idea of what I have observed when using daisy chained equipment. The horizontal axis of the graph represents seconds (1 reading per second) the vertical access represents the time difference in nano seconds between an OCXO and a GPSDO that is daisy chained with other devices. The blips are associated with equipment being powered off and on that is daisy chained to the GPSDO. As a control I also repeated the experiment using another OCXO as a signal source (in lieu of the GPSDO) and did not see the phase jump when the same equipment was power cycled. The GPSDO is located in another room and fed from another circuit thru a UPS so I'm confident it's not being somehow influenced via power fluctuations by the other equipment being turned off and on. I made the measurements with an HP5370B which is also powered via a UPS. If anyone would like more details or can't view the file please let me know. Regards Mark Spencer --- On Mon, 3/12/12, Bob Bownes bow...@gmail.com wrote: From: Bob Bownes bow...@gmail.com Subject: Re: [time-nuts] 0MHz distribution...NOT To: Discussion of precise time and frequency measurement time-nuts@febo.com Received: Monday, March 12, 2012, 5:43 PM What, if any, are the phase changes? On Mon, Mar 12, 2012 at 5:39 PM, Chuck Forsberg WA7KGX N2469R c...@omen.comwrote: On 03/10/2012 04:44 PM, Mark Spencer wrote: I've done this as well. I daisy chained several pieces of hp and marconi gear together that all had an approx 1k ohm input impedance for the frequency reference and fed them from a single 10 Mhz source via t connectors with a 50 ohm terminator at the end of the line. Looking at the signal with either a scope or a time interval counter I have seen noticeable phase shifts when some of the equipment receiving this signal is turned off or on. That being said so long as the equipment was not turned off or on the adev of the signal was as expected. Your mileage may vary. Sent from my iPad On 2012-03-10, at 4:24 PM, Michael Blazermbla...@satx.rr.com wrote: You may want to take a look at the signal on a scope. Most instruments terminate their reference input. You might actually have 4 50 ohm loads on the Thunderbolt's output and the input voltage might be marginal. If your instruments have both reference input and output, it's better to daisy chain the units. On 3/10/2012 5:10 PM, Chuck Forsberg WA7KGX N2469R wrote: A month or two ago I had sketched out a simple distribution amp for my 10 MHz reference. In the meantime I became somewhat disillusioned about my FE-5680a standards. So I removed the FE-5680a and disconnected its power supply from the box that holds the Thunderbolt, power supply, and big line filter. I decided to try daisy-chaining the Thunderbolt's 10 MHz output. I have plenty of hardware left over from the days of 10BaseT networking. So I have the Thunderbolt going to a BNC T on the back of my FlexRadio 1500, hence to my Advantest U3641 spectrum analyzer, and finally to the external reference on my Racal-Dana 1992 nanosecond universal counter. That end has a 50 ohm termination on the other side of its T connector. All three devices seem happy with the 10 MHz they are receiving. I connected my Tek 2712 to the end of the chain. It reads +10dbm +-1db. Switching units on/off/ext ref causes less than 1db change in the 10 MHz. -- Chuck Forsberg WA7KGX N2469R c...@omen.com www.omen.com Developer of Industrial ZMODEM(Tm) for Embedded Applications Omen Technology Inc The High Reliability Software 10255 NW Old Cornelius Pass Portland OR 97231 503-614-0430 __**_ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/** mailman/listinfo/time-nutshttps://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. phase jump.emf ___ 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.
