Re: [time-nuts] Brooks Shera
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY I had an email reply from him a couple of months ago. Reply was less than 24 Hours. A couple of weeks ago I needed a PIC for his project and ended up programming it from the file I downloaded from his site. Biggest problem was finding the PIC as it is quite old. David At 11:07 AM 3/10/2007, you wrote: >I emailed Brooks about four weeks ago asking him if he could still supply >the programmed PICs as he volunteered when his article was first published. >I got no response, does anyone know of Brooks? > > >___ >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. > > > >-- >No virus found in this incoming message. >Checked by AVG Free Edition. >Version: 7.5.488 / Virus Database: 269.13.39/1045 - Release Date: >2/10/2007 6:43 PM David G. Hopkins (Vk4ZF) CAPALABA QLD. AUSTRALIA S27 32.191 E153 11.867 -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.488 / Virus Database: 269.13.39/1045 - Release Date: 2/10/2007 6:43 PM ___ 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] Brooks Shera
I emailed Brooks about four weeks ago asking him if he could still supply the programmed PICs as he volunteered when his article was first published. I got no response, does anyone know of Brooks? ___ 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] Lucent WR-92066 L10 RFG-XO on EB**
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY Bill Janssen wrote: > OK I bought one of those Rubidium's off of that E*** place and I am > wondering what > I am getting. > > Is it obvious how to power it up or do I need a manual, Some one on here > had some pictures, > that I didn't book mark. Anyone have details of that device or did I > just order another door stop. > > Thanks > Bill K7NOM > > Your mention of "one of those Rubidium's" isn't too informative. The subject of the email mentions RFG-XO which is a crystal oscillator, not a rubidium, I think. I got one of the RFG-RB units from a while back. It does have a good LPRO-101 rubidium module in it, which I think is decent. I don't actually see much useful from the boards inside the Lucent boxes (other than the Rubidium) unless you want the 15 MHz they generate from 10 MHz for some reason. I didn't see any connections for frequency disciplining inside the one I got. I was planning to just use the LPRO and add the boards to my junk collection, but didn't do it yet. Also, from the discussions here, it sounded like there were a couple different flavors of similar boxes. So, a more exact description of what you bought will get you better information. ___ 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] Lucent WR-92066 L10 RFG-XO on EB**
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY OK I bought one of those Rubidium's off of that E*** place and I am wondering what I am getting. Is it obvious how to power it up or do I need a manual, Some one on here had some pictures, that I didn't book mark. Anyone have details of that device or did I just order another door stop. Thanks Bill K7NOM ___ 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] oscillator aging
On Tue, 2 Oct 2007, Rick Karlquist wrote: > No oscillators are in the non aging category. Very true! For fun and education, perhaps someone local to me in San Jose would like to test the aging of a HP precision oscillator standard that has been powered almost continuously for a half century! It is a 107BR 5MHz standard which contains a wonderful crystal that HP used to make themselves. The only time it has been unplugged was while transporting it from Eimac a couple of decades ago. I have had it on a ups power system ever since. I have not tweaked the tuning in years nor checked its frequency recently as I am using a disciplined Austron standard with a loran-c receiver for my lab. The meter on the HP107 panel says it is still putting out the right amount of RF power. No repairs in 50 years; that is reliability. Regards, Jeffrey Pawlan ___ 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] E1938
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY No oscillators are in the non aging category. However, the E1938 and 10811 are in the RANDOM aging category. As I previously said, the direction of the aging is random. Now you have brought up the so called disciplined oscillator concept. This concept admits that the direction and slope of aging is random between oscillators, but maintains that an individual oscillator has a known direction and slope that can be taken out. This is an extension of the initial fallacy. Oscillators can initially age in one direction for a while and then change directions. Also, the slope may be fairly constant, allowing disciplining. or it may gradually decrease. However, it is also a fallacy to think that the aging will asymptotically approach zero if you wait long enough. There are now extremely old 10811's, and you will find that their aging is nothing special. The discipling concept with frequent GPS updates only assumes that aging characteristics won't change abruptly. That is the one assumption that is probably fairly safe. However, all oscillators exhibit frequency jumps, that will only be made up after the time constant of the GPS loop has time to track them out. When reading papers on discipled oscillators, pay no attention to anecdotal data. The only data that counts is on large numbers of oscillators over large spans of time. Rick Brooke Clarke wrote: > Hi Rick: > > I've heard that but it's not clear to me which oscillators are in the non > aging > catagory. For example what about the HP 10811 or the Stanford Research SC > 10? > > The plot on Brooks Shrea's web page for his GPSDO shows linear aging on > his > Austron 1250. See: http://www.rt66.com/%7Eshera/index_fs.htm > > Have Fun, > > Brooke Clarke > http://www.PRC68.com > http://www.precisionclock.com > http://www.prc68.com/I/WebCam2.shtml 24/7 Sky-Weather-Astronomy Cam > > > Rick Karlquist wrote: >> ); SAEximRunCond expanded to false >> Errors-To: [EMAIL PROTECTED] RETRY >> >> This question keeps coming up in relation to various crystal >> oscillators. Basically, if you have a really good process, >> which HP had for the E1938A, there will be no bias in favor >> of aging in any particular direction. If there was any >> bias, the cause of it would be investigated and then eliminated. >> The main source of aging that remains is believed to be microcracks. >> These can increase or decrease frequency. >> >> Now if you are talking about colorburst crystals, they usually age down >> because crud from the package deposits on the crystal to >> a greater extent than dirt on the crystal flying away. >> >> Rick N6RK >> >> >> >> >> Brooke Clarke wrote: >> >>>); SAEximRunCond expanded to false >>>Errors-To: [EMAIL PROTECTED] RETRY >>> >>>Hi Rick: >>> >>>If the aging drift is up in frequency then there might be an advantage >>> in >>>starting at the low end of the window. Any idea of how these age? >>> >>>Have Fun, >>> >>>Brooke Clarke >>>http://www.PRC68.com >>>http://www.precisionclock.com >>>http://www.prc68.com/I/WebCam2.shtml 24/7 Sky-Weather-Astronomy Cam >>> >>> >>>Richard (Rick) Karlquist wrote: >>> ); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY The labels may or may not be significant. If the frequency is indeed -2.94 Hz at 2.5V EFC, you could probably get it back to 10 MHz by increasing the EFC voltage. You can also decrease the bridge capacitor to bring the frequency up if necessary. The factory was supposed to choose the capacitor to get 10 MHz in the center of the EFC range. If this is not correct, the oscillator is usually perfectly OK , and they just goofed on the capacitor. The capacitor installation process had a lot of problems. Should be safe to power it up and see what the status is. Rick N6RK Jeroen Bastemeijer wrote: >); SAEximRunCond expanded to false >Errors-To: [EMAIL PROTECTED] RETRY > >Dear All, > >After some shipping time, my E1938 arrived today! :-) :-) :-) > >Thank you Rick! > >First thing was examining the board, oscillator and the HP-test >notes/labels. Most of the specs mentioned there are logical and > numbers >are very reasonable. ;-) However, one spec drew my attention: "Hz off >freq. after warm up: -2,94". Does anyone know what it means? Is this > the >offset after warm-up without EFC applied? > >The unit hasn't been powered up. Whit the hardware at hand I first > want >to read some docs to be sure about what I'm doing. For comparison, > what >other numbers are around for the "Hz off freq. after warm up"-spec? > >Final result of the HP-test was: PASS. So, I assume this number is OK. >What is your opinion? Looking forward to your reactions. > >73 Jeroen PE1RGE > ___ tim
Re: [time-nuts] E1938
Hi Rick: I've heard that but it's not clear to me which oscillators are in the non aging catagory. For example what about the HP 10811 or the Stanford Research SC 10? The plot on Brooks Shrea's web page for his GPSDO shows linear aging on his Austron 1250. See: http://www.rt66.com/%7Eshera/index_fs.htm Have Fun, Brooke Clarke http://www.PRC68.com http://www.precisionclock.com http://www.prc68.com/I/WebCam2.shtml 24/7 Sky-Weather-Astronomy Cam Rick Karlquist wrote: > ); SAEximRunCond expanded to false > Errors-To: [EMAIL PROTECTED] RETRY > > This question keeps coming up in relation to various crystal > oscillators. Basically, if you have a really good process, > which HP had for the E1938A, there will be no bias in favor > of aging in any particular direction. If there was any > bias, the cause of it would be investigated and then eliminated. > The main source of aging that remains is believed to be microcracks. > These can increase or decrease frequency. > > Now if you are talking about colorburst crystals, they usually age down > because crud from the package deposits on the crystal to > a greater extent than dirt on the crystal flying away. > > Rick N6RK > > > > > Brooke Clarke wrote: > >>); SAEximRunCond expanded to false >>Errors-To: [EMAIL PROTECTED] RETRY >> >>Hi Rick: >> >>If the aging drift is up in frequency then there might be an advantage in >>starting at the low end of the window. Any idea of how these age? >> >>Have Fun, >> >>Brooke Clarke >>http://www.PRC68.com >>http://www.precisionclock.com >>http://www.prc68.com/I/WebCam2.shtml 24/7 Sky-Weather-Astronomy Cam >> >> >>Richard (Rick) Karlquist wrote: >> >>>); SAEximRunCond expanded to false >>>Errors-To: [EMAIL PROTECTED] RETRY >>> >>>The labels may or may not be significant. If the frequency >>>is indeed -2.94 Hz at 2.5V EFC, you could probably get it back >>>to 10 MHz by increasing the EFC voltage. You can also decrease >>>the bridge capacitor to bring the frequency up if necessary. >>>The factory was supposed to choose the capacitor to get 10 MHz >>>in the center of the EFC range. If this is not correct, the >>>oscillator is usually perfectly OK , and they just >>>goofed on the capacitor. The capacitor installation process >>>had a lot of problems. Should be safe to power it up and see >>>what the status is. >>> >>>Rick N6RK >>> >>>Jeroen Bastemeijer wrote: >>> >>> ); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY Dear All, After some shipping time, my E1938 arrived today! :-) :-) :-) Thank you Rick! First thing was examining the board, oscillator and the HP-test notes/labels. Most of the specs mentioned there are logical and numbers are very reasonable. ;-) However, one spec drew my attention: "Hz off freq. after warm up: -2,94". Does anyone know what it means? Is this the offset after warm-up without EFC applied? The unit hasn't been powered up. Whit the hardware at hand I first want to read some docs to be sure about what I'm doing. For comparison, what other numbers are around for the "Hz off freq. after warm up"-spec? Final result of the HP-test was: PASS. So, I assume this number is OK. What is your opinion? Looking forward to your reactions. 73 Jeroen PE1RGE >>> >>> >>>___ >>>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] E1938
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY This question keeps coming up in relation to various crystal oscillators. Basically, if you have a really good process, which HP had for the E1938A, there will be no bias in favor of aging in any particular direction. If there was any bias, the cause of it would be investigated and then eliminated. The main source of aging that remains is believed to be microcracks. These can increase or decrease frequency. Now if you are talking about colorburst crystals, they usually age down because crud from the package deposits on the crystal to a greater extent than dirt on the crystal flying away. Rick N6RK Brooke Clarke wrote: > ); SAEximRunCond expanded to false > Errors-To: [EMAIL PROTECTED] RETRY > > Hi Rick: > > If the aging drift is up in frequency then there might be an advantage in > starting at the low end of the window. Any idea of how these age? > > Have Fun, > > Brooke Clarke > http://www.PRC68.com > http://www.precisionclock.com > http://www.prc68.com/I/WebCam2.shtml 24/7 Sky-Weather-Astronomy Cam > > > Richard (Rick) Karlquist wrote: >> ); SAEximRunCond expanded to false >> Errors-To: [EMAIL PROTECTED] RETRY >> >> The labels may or may not be significant. If the frequency >> is indeed -2.94 Hz at 2.5V EFC, you could probably get it back >> to 10 MHz by increasing the EFC voltage. You can also decrease >> the bridge capacitor to bring the frequency up if necessary. >> The factory was supposed to choose the capacitor to get 10 MHz >> in the center of the EFC range. If this is not correct, the >> oscillator is usually perfectly OK , and they just >> goofed on the capacitor. The capacitor installation process >> had a lot of problems. Should be safe to power it up and see >> what the status is. >> >> Rick N6RK >> >> Jeroen Bastemeijer wrote: >> >>>); SAEximRunCond expanded to false >>>Errors-To: [EMAIL PROTECTED] RETRY >>> >>>Dear All, >>> >>>After some shipping time, my E1938 arrived today! :-) :-) :-) >>> >>>Thank you Rick! >>> >>>First thing was examining the board, oscillator and the HP-test >>>notes/labels. Most of the specs mentioned there are logical and numbers >>>are very reasonable. ;-) However, one spec drew my attention: "Hz off >>>freq. after warm up: -2,94". Does anyone know what it means? Is this the >>>offset after warm-up without EFC applied? >>> >>>The unit hasn't been powered up. Whit the hardware at hand I first want >>>to read some docs to be sure about what I'm doing. For comparison, what >>>other numbers are around for the "Hz off freq. after warm up"-spec? >>> >>>Final result of the HP-test was: PASS. So, I assume this number is OK. >>>What is your opinion? Looking forward to your reactions. >>> >>>73 Jeroen PE1RGE >>> >> >> >> ___ >> 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] Prologix GPIB & LeCroy ScopeExplorer
Hello, If anyone has used Prologix GPIB-USB controller with LeCroy ScopeExplorer, could you please contact [EMAIL PROTECTED] offline? Much appreciated. Regards, Abdul ___ 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] E1938
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY Hi Rick: If the aging drift is up in frequency then there might be an advantage in starting at the low end of the window. Any idea of how these age? Have Fun, Brooke Clarke http://www.PRC68.com http://www.precisionclock.com http://www.prc68.com/I/WebCam2.shtml 24/7 Sky-Weather-Astronomy Cam Richard (Rick) Karlquist wrote: > ); SAEximRunCond expanded to false > Errors-To: [EMAIL PROTECTED] RETRY > > The labels may or may not be significant. If the frequency > is indeed -2.94 Hz at 2.5V EFC, you could probably get it back > to 10 MHz by increasing the EFC voltage. You can also decrease > the bridge capacitor to bring the frequency up if necessary. > The factory was supposed to choose the capacitor to get 10 MHz > in the center of the EFC range. If this is not correct, the > oscillator is usually perfectly OK , and they just > goofed on the capacitor. The capacitor installation process > had a lot of problems. Should be safe to power it up and see > what the status is. > > Rick N6RK > > Jeroen Bastemeijer wrote: > >>); SAEximRunCond expanded to false >>Errors-To: [EMAIL PROTECTED] RETRY >> >>Dear All, >> >>After some shipping time, my E1938 arrived today! :-) :-) :-) >> >>Thank you Rick! >> >>First thing was examining the board, oscillator and the HP-test >>notes/labels. Most of the specs mentioned there are logical and numbers >>are very reasonable. ;-) However, one spec drew my attention: "Hz off >>freq. after warm up: -2,94". Does anyone know what it means? Is this the >>offset after warm-up without EFC applied? >> >>The unit hasn't been powered up. Whit the hardware at hand I first want >>to read some docs to be sure about what I'm doing. For comparison, what >>other numbers are around for the "Hz off freq. after warm up"-spec? >> >>Final result of the HP-test was: PASS. So, I assume this number is OK. >>What is your opinion? Looking forward to your reactions. >> >>73 Jeroen PE1RGE >> > > > ___ > 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] E1938
The labels may or may not be significant. If the frequency is indeed -2.94 Hz at 2.5V EFC, you could probably get it back to 10 MHz by increasing the EFC voltage. You can also decrease the bridge capacitor to bring the frequency up if necessary. The factory was supposed to choose the capacitor to get 10 MHz in the center of the EFC range. If this is not correct, the oscillator is usually perfectly OK , and they just goofed on the capacitor. The capacitor installation process had a lot of problems. Should be safe to power it up and see what the status is. Rick N6RK Jeroen Bastemeijer wrote: > ); SAEximRunCond expanded to false > Errors-To: [EMAIL PROTECTED] RETRY > > Dear All, > > After some shipping time, my E1938 arrived today! :-) :-) :-) > > Thank you Rick! > > First thing was examining the board, oscillator and the HP-test > notes/labels. Most of the specs mentioned there are logical and numbers > are very reasonable. ;-) However, one spec drew my attention: "Hz off > freq. after warm up: -2,94". Does anyone know what it means? Is this the > offset after warm-up without EFC applied? > > The unit hasn't been powered up. Whit the hardware at hand I first want > to read some docs to be sure about what I'm doing. For comparison, what > other numbers are around for the "Hz off freq. after warm up"-spec? > > Final result of the HP-test was: PASS. So, I assume this number is OK. > What is your opinion? Looking forward to your reactions. > > 73 Jeroen PE1RGE > ___ 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] E1938
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY Dear All, After some shipping time, my E1938 arrived today! :-) :-) :-) Thank you Rick! First thing was examining the board, oscillator and the HP-test notes/labels. Most of the specs mentioned there are logical and numbers are very reasonable. ;-) However, one spec drew my attention: "Hz off freq. after warm up: -2,94". Does anyone know what it means? Is this the offset after warm-up without EFC applied? The unit hasn't been powered up. Whit the hardware at hand I first want to read some docs to be sure about what I'm doing. For comparison, what other numbers are around for the "Hz off freq. after warm up"-spec? Final result of the HP-test was: PASS. So, I assume this number is OK. What is your opinion? Looking forward to your reactions. 73 Jeroen PE1RGE -- Ing. Jeroen Bastemeijer Delft University of Technology Department of Electrical Engineering Electronic Instrumentation Laboratory Mekelweg 4, Room 13.090 2628 CD Delft The Netherlands Phone: +31.15.27.86542 Fax: +31.15.27.85755 E-mail: [EMAIL PROTECTED] GPS: Lat N52.2 Lon E4.37157 Alt 46.2m ___ 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.
