Re: [time-nuts] HP5370A vs HP5370B...
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] I don't know the specifics of this case, but often the model number suffix was incremented just to obsolete the existing installed base. Once obsoleted, the clock started to run on the support life (typically 5 years). Keep in mind that ECO's can be and often are applied to products without incrementing the suffix. The chances are like you said, some component went obsolete, and they needed to do a lifetime buy, etc. Rick Karlquist N6RK > -Original Message- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] > Behalf Of Chuck Harris > Sent: Wednesday, July 04, 2007 5:52 PM > To: Discussion of precise time and frequency measurement > Subject: [time-nuts] HP5370A vs HP5370B... > > > ); SAEximRunCond expanded to false > Errors-To: > [EMAIL PROTECTED] > > Hi, > > I am curious, what are the differences between the A and B models of the > 5370 interval counter. The panels seem to be the same, and the > specifications > seem to be the same. Is the difference noticeable, or just > something like a > different processor chip? > > Thanks! > > -Chuck Harris > > ___ > 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] HP5370A vs HP5370B...
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] Hi, I am curious, what are the differences between the A and B models of the 5370 interval counter. The panels seem to be the same, and the specifications seem to be the same. Is the difference noticeable, or just something like a different processor chip? Thanks! -Chuck Harris ___ 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] Tracor 527E Manual
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] Whoops Please ignore my previous message, if you haven't already:-), it was supoosed to have gone direct to Didier. regards Nigel GM8PZR ___ 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] Tracor 527E Manual
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] Hi Didier After Scott anounced that he'd uploaded the 527A manual to your site I realised that I had the manual for the 527E, came from Teknet some time ago, so I've uploaded that one too. regards Nigel ___ 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] Was Tracor 527A manual...now Tracor 527E Manual
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] Now if I had the password . 73, Dick, W1KSZ [EMAIL PROTECTED] wrote: > G'Day All, > I have copied a scan of a Tracor 527A manual to Didier Juges's site > ftp.ko4bb.com > It is ~13MB, file name 527A_op_serv_manual.pdf I hope that is OK > Didier? > Regards Scott > P.S. If you need it in a hurry I can mail and/or copy some where else > for you. > > > > Hi Scott and All > > Many thanks Scott for the 527A manual. > > It was only when downloading it that I discovered a 527E manual in my > archives, of similar size, that I must have downloaded some time ago and > forgotten > about. > > I'm now also uploading that one to Didier's site, should be finished in > about 10 minutes, 23:50 UK time. > Both can be found in his upload folder for now. > > regards > > Nigel > GM8PZR > > > > > ___ > 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. > -- 73, Dick, W1KSZ ___ 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] Was Tracor 527A manual...now Tracor 527E Manual
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] G'Day All, I have copied a scan of a Tracor 527A manual to Didier Juges's site ftp.ko4bb.com It is ~13MB, file name 527A_op_serv_manual.pdf I hope that is OK Didier? Regards Scott P.S. If you need it in a hurry I can mail and/or copy some where else for you. Hi Scott and All Many thanks Scott for the 527A manual. It was only when downloading it that I discovered a 527E manual in my archives, of similar size, that I must have downloaded some time ago and forgotten about. I'm now also uploading that one to Didier's site, should be finished in about 10 minutes, 23:50 UK time. Both can be found in his upload folder for now. regards Nigel GM8PZR ___ 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] Neat toys on eBay for PN measurement
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] > Mark Kahrs wrote: > Hey, why not buy a 11848A (160117841068) from the same seller? > Only 2.6K$! > Put that in your PN system... I saw that, but (a) the 11729C already did enough damage to the exchequer, and (b) I'm not clear on what an 11848A does for you if you don't have the 3048A system software. I don't believe there is anything in the 11848A box that isn't also in the 11729C, and the 11729 has a lot of stuff (like the microwave downconverter) that is not present in the 11848. Maybe Rick K. or someone familiar with the hardware can speak to that? I already have a few hundred bucks in a 35601A (the 11848A equivalent from the older 3047A noise-measurement system) that didn't turn out to be very practical to mess with, so I'm leery of spending any more money than necessary on equipment that can't be used without writing a lot of code and adding yet more hardware. One nice thing about the 11729 is that it has front-panel buttons that correspond to all of its GPIB features, so I don't *have* to write any code before I can try it out. -- john, KE5FX ___ 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] Neat toys on eBay for PN measurement
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] That's something I meant to ask you about, Rick, as a follow-up to an old Usenet post of yours from 1995. From looking over the block diagram in the 11729B-1 app note, it appears that there is no reason why you couldn't feed any sufficiently-clean 640 MHz signal in. Obviously, you want to drive it with the cleanest source you can find, but I don't see any other constraints. But some of the 8662As did not have the optional (003) "specified SSB phase noise for rear-panel output" feature, including mine. They all seem to have provided a 640 MHz output at an unused internal SMB jack, though. Is there something special about the reference multiplier section in an option-3 8662A that actually improves the noise level available at this jack? I'd already added a BNC jack to the rear panel to bring the 640 MHz clock out in anticipation of buying or building a downconverter, and I expect it will work OK with this 11729C, but I am not sure whether I should expect the fully-characterized option-3 noise performance, or something worse. Any thoughts on that? >From your Usenet post I understand that there is supposed to be a feature that lets you turn the built-in 640 MHz SAW filter into an oscillator in case an 8662A isn't available, but I also understand that this is really only a utility/test function. If there's no way to phase-lock the resulting SAW oscillator, I can see why. -- john, KE5FX > Not only is an 8662A mandatory, but it must have the optional 640 > MHz output > AFAIK. > How do you propose to operate an 11729 without an 8662? It's not like you > can > feed any old 640 MHz reference into it. ___ 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] ? phase comparison or other device
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] On Friday 29 June 2007 13:08, Juerg Koegel wrote: > Another article (with practical hints) is> > OPTIMIZATION OF DUAL-MIXER TIME-DIFFERENCE MULTIPLIER > L. Sojdr, J. Cermák, R. Barillet > It is too big for the Time Nuts annex (912k) As Juerg did not have space for the paper, I added it to the Application Notes section of my http://www.unusualresearch.com/ site. If anyone else needs a home for an odd ball paper and does not have the space or inclination to set up a web site, I'm happy to post the papers. Also if you need to reduce the size of a large .pdf, you can use http://any2djvu.djvuzone.org to reduce and OCR them. The 912K .pdf comes in as a 127K DjVu file. -- http://www.wearablesmartsensors.com/ http://www.softwaresafety.net/ http://www.designer-iii.com/ http://www.unusualresearch.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] May I ask for your advice on a faulty 5370B?
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] S McNamara wrote: > Thanks Bruce, > I used a HP5335A counter to measure the ref out at 10.000,000,3MHz and the > 200MHz test point-1 > on the multiplier board as 200.000,007 MHz > The HP5335 is not calibrated but it looks like the multiplier is working O.K. > I have no way to measure the harmonics as I do not have a RF spectrum > analyser. > The test point has a nice 200MHz sine wave as tested with my eye and a 150MHz > CRO. > I also adjusted the DAC voltages on A18 although they were close enough. > BTW I think the "set test switch" settings for the DAC module A18 may have a > error. > I think the OA cal switch settings should be the same as the OO cal settings. > > Could the harmonics from the multiplier be causing the problem? > Thanks & Regards Scott > With a 150MHz scope almost anything at 200MHz will appear to be a reasonable sinewave. How clean is the 10MHz output? The subharmonic content of the 200MHz output is well known to be a cause of excessive jitter should the frequency multiplier chain filters not be correctly adjusted. The sidebands around the 200MHz output have to be 65 dB or more down for correct operation, an oscilloscope is inadequate for checking this requirement. Other causes could be faulty chips in the count chain. 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.
Re: [time-nuts] Neat toys on eBay for PN measurement
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] Hey, why not buy a 11848A (160117841068) from the same seller? Only 2.6K$! Put that in your PN system... On 7/4/07, Richard (Rick) Karlquist <[EMAIL PROTECTED]> wrote: > > ); SAEximRunCond expanded to false > Errors-To: time-nuts-bounces+mark.kahrs= > [EMAIL PROTECTED] > > > Basically this is a general-purpose microwave downconverter whose LO > uses > > harmonics of the 640-MHz reference output from an 8662A/8663A to > > downconvert > > the signal to be measured to a frequency below 1280 MHz, where it is > then > > mixed down to a baseband IF with the same 8662A's output. An 8662A is > not > > mandatory, but it's convenient because it can provide both LOs at once. > > Not only is an 8662A mandatory, but it must have the optional 640 MHz > output > AFAIK. > How do you propose to operate an 11729 without an 8662? It's not like you > can > feed any old 640 MHz reference into it. > > Rick Karlquist N6RK > > > ___ > 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] May I ask for your advice on a faulty 5370B?
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] >Check the frequency multiplier chain alignment. >Bruce Thanks Bruce, I used a HP5335A counter to measure the ref out at 10.000,000,3MHz and the 200MHz test point-1 on the multiplier board as 200.000,007 MHz The HP5335 is not calibrated but it looks like the multiplier is working O.K. I have no way to measure the harmonics as I do not have a RF spectrum analyser. The test point has a nice 200MHz sine wave as tested with my eye and a 150MHz CRO. I also adjusted the DAC voltages on A18 although they were close enough. BTW I think the "set test switch" settings for the DAC module A18 may have a error. I think the OA cal switch settings should be the same as the OO cal settings. Could the harmonics from the multiplier be causing the problem? Thanks & Regards Scott ___ 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.
