Re: [time-nuts] softmark-usb-gpib
Dear Sir, I hope that you are in receipt of the information I sent you on Softmark USB-GPIB. Kindly advice, if you can help. Have a nice day! Thanking you, Mathew George From: John Fisher [EMAIL PROTECTED] Reply-To: Discussion of precise time and frequency measurementtime-nuts@febo.com To: time-nuts@febo.com Subject: [time-nuts] softmark-usb-gpib Date: Thu, 20 Sep 2007 09:36:56 -0700 ); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY -- Message: 5 Date: Thu, 20 Sep 2007 12:45:58 + From: Dileep MG [EMAIL PROTECTED] Subject: [time-nuts] softmark-usb-gpib To: time-nuts@febo.com Message-ID: [EMAIL PROTECTED] Content-Type: text/plain; format=flowed Hi all, Will someone be able to give me some inputs on using usb-gpib interface from softmark? Information regarding coding with the ocx file which comes with the board, can be helpful. I thank you for the help, in advance. Mathew Mathew, I don't know that board, but the Prologix USB_GPIB is incredibly easy to use and not too expensive. Drivers available for every OS too. Does your manual say what the driver chip is? Where are you stuck? You will get a lot more help with specific needs expressed... Regards, jack ___ 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. _ Tried the new MSN Messenger? Its cool! Download now. http://messenger.msn.com/Download/Default.aspx?mkt=en-in ___ 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] FE-5680A pinout
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY Stan, Rex and Peter, Thak you very much for all the information about the oscillator. I´ve just received reply from the manufacturer, as you can see below. I´ll try to get information from Motorola, but I think it´s a rather difficult task. Best regards, José, EA1PX ___ Jose, This is a special for Motorola. You have to contact Motorola for their information. John Cuthbertson Director, Sales and Marketing Tel: 516-794-4500 Ext. 5105 Fax: 516-794-4340 [EMAIL PROTECTED] ___ 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] FMT on October 13
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY The Midwest VHF/UHF Society (located in Southwest Ohio) is pleased to announce that the first annual MVUS Frequency Measuring Test will be held on Saturday, October 13, 2007. There will be two transmission periods: the first at 14:30 EDT (1830 UTC), and the second at 21:30 EDT (0130 UTC Sunday). Transmissions will be on the 80M, 40M, and 30M amateur bands from Dayton, Ohio under the callsign W8KSE. Frequencies will be approximately: 3555 kHz, 7055 kHz, and 10115 kHz, but be prepared to tune as we will adjust to minimize QRM. The transmitters will be running about 75 watts output into wire antennas for each band. All the transmitters will be driven from a common frequency standard. We will transmit on all three bands simultaneously. Plans are to transmit two 10 minute test periods, and a third if the transmitters aren't melting by that point. The frequency will be changed by a small amount (less than 200 Hz) between transmission periods. So, a complete submission will include two or three separate measurements for each band. Our goal is to transmit a signal known in frequency to parts in 10e-12 (i.e., less than 0.0001 Hz error at 10 MHz) and stable to a similar level during the course of the transmission. Frequencies will be measured at the transmitter site with a system capable of microHertz resolution referenced to a GPS disciplined oscillator, and will also be monitored by another station in groundwave range that can measure the frequencies with similar accuracy. The MVUS Frequency Measuring Test is intended to supplement, not replace, the ARRL FMT. Further information, including approximate transmission frequencies, will be posted at http://www.febo.com/time-freq/FMT. You can also send email with questions or comments (or, after the test, your results!) to [EMAIL PROTECTED]. For discussion about off-air frequency measurement, we suggest you check out the FMT-nuts mailing list, sponsored by Connie Marshall, K5CM. For details, go to http://tech.groups.yahoo.com/group/FMT-nuts/. ___ 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] FMT on October 13
Plans are to transmit two 10 minute test periods, and a third if the transmitters aren't melting by that point. Our goal is to transmit a signal known in frequency to parts in 10e-12 (i.e., less than 0.0001 Hz error at 10 MHz) and stable to a similar level during the course of the transmission. Frequencies will be measured at the transmitter site with a system capable of microHertz resolution referenced to a GPS disciplined oscillator, and will also be monitored by another station in groundwave range that can measure the frequencies with similar accuracy. Suppose I have a pile of good lab gear, and it gets N seconds of signal. How accurately can it measure the frequency? -- 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.
[time-nuts] HP-3566 Mini Manual
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY Nice web page at KO4BB's Home Page: http://www.ko4bb.com Lots of good stuff including a 30 page brief operating manual for the 3586. Take the Internet to Go: Yahoo!Go puts the Internet in your pocket: mail, news, photos more. http://mobile.yahoo.com/go?refer=1GNXIC ___ 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] FMT on October 13
Plans are to transmit two 10 minute test periods, and a third if the transmitters aren't melting by that point. Our goal is to transmit a signal known in frequency to parts in 10e-12 (i.e., less than 0.0001 Hz error at 10 MHz) and stable to a similar level during the course of the transmission. Frequencies will be measured at the transmitter site with a system capable of microHertz resolution referenced to a GPS disciplined oscillator, and will also be monitored by another station in groundwave range that can measure the frequencies with similar accuracy. Suppose I have a pile of good lab gear, and it gets N seconds of signal. How accurately can it measure the frequency? Hi Hal, If you have a low noise CW signal, a cheap, legacy 1 ns resolution counter will give you 9 digits of resolution per second. So to measure to parts in 10^12 requires gate times on the order of a thousand seconds. A fancier, modern counter like a HP 53132A is almost ten times better than that so 100 s gate times are all you need for 12 digits. Further, if it's an oddball frequency (i.e., not a nice multiple or fraction of 10 MHz) even 10 second gate times are sufficient with this counter (it does clever CW oversampling inside). For extreme counters like HP 5370 or SR 620 with resolution well under 50 ps you can measure any frequency to 12 digits in a matter of tens of seconds. The main problems at this level are often that neither your frequency reference nor the frequency you are measuring are stable to parts in 10^12th. So the measurements you get will contain the sum of noise in both sources and the counter itself. And this noise is often well above parts in 10^12th. It takes time, statistics, or other tests to determine the noise contribution of each. I would think this is especially true for non-local frequencies, such as one received over the air. I'll leave it to you FMT guys to comment on the magnitude of degradation due to transmission and reception noise. While were at it, in the case mentioned above I'm a curious about their FMT frequency standard -- if it's really accurate to parts in 10^12, as they imply, over 10 minutes. I could believe this if it were an Rb or Cs-based GPSDO. Usually the accuracy of GPS disciplined oscillators are spec'd for averaging times over a day. And at one day, parts in 10^12 is very easy (many are down in the low 13's or 14's). But over a short span like 10 minutes most quartz-based GPSDO wander in frequency by many parts in 10^11. See, for example, these two nice quartz GPSDO over 10 minutes and note the scale is 1e-11 per *division*; which is almost 1e-10 full-scale. http://www.leapsecond.com/pages/fury/#6 /tvb ___ 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] FMT on October 13
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY I guess it depends on signal to noise ratio. With reciprocal counters, you only need one period to measure as acurately as you need, but to have good acuracy, you need very good S/N, as there is no filtering possible. For example, the HP 5370 can measure a single period of a signal with a resolution of 20pS (excluding noise and trigger imperfections), so excluding these errors, the HP 5370 could measure a single period of a ~3.5 MHz signal with 7 x10-5 precision (if I have not goofed the calculations) More periods improve the resolution proportionately to the quare root. Accuracy is another matter. Didier KO4BB -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Hal Murray Sent: Monday, September 24, 2007 5:26 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] FMT on October 13 Plans are to transmit two 10 minute test periods, and a third if the transmitters aren't melting by that point. Our goal is to transmit a signal known in frequency to parts in 10e-12 (i.e., less than 0.0001 Hz error at 10 MHz) and stable to a similar level during the course of the transmission. Frequencies will be measured at the transmitter site with a system capable of microHertz resolution referenced to a GPS disciplined oscillator, and will also be monitored by another station in groundwave range that can measure the frequencies with similar accuracy. Suppose I have a pile of good lab gear, and it gets N seconds of signal. How accurately can it measure the frequency? -- 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. ___ 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] FMT on October 13
Didier Juges wrote: I guess it depends on signal to noise ratio. With reciprocal counters, you only need one period to measure as acurately as you need, but to have good acuracy, you need very good S/N, as there is no filtering possible. For example, the HP 5370 can measure a single period of a signal with a resolution of 20pS (excluding noise and trigger imperfections), so excluding these errors, the HP 5370 could measure a single period of a ~3.5 MHz signal with 7 x10-5 precision (if I have not goofed the calculations) More periods improve the resolution proportionately to the quare root. Accuracy is another matter. Didier KO4BB Didier With band limited gaussian noise and an SNR of 40dB the rms error in measuring the period of a single cycle is about 0.3% Bruce ___ 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.