[time-nuts] WWVB remodulator dropbox links (I hope)
Here are 2 documents I can add several 2 MB pictires and such if it works. The other comment is that its great to see the interest from various time-nuts. Thanks https://www.dropbox.com/s/rvc6k4qxq9d0t30/Remodulator%20operational%2006282014a.sch https://www.dropbox.com/s/4lg70hf9erhqszt/WWVB%20remodulator%20update%2007012014.pdf Regards Paul WB8TSL ___ 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] Trimble OCXOs - 6525, ... and ...
Hi there, I've noticed a couple of Trimble OCXOs listed on that auction site. Specifically, model numbers: - 65256 - 49423 - 34310 C1 They all seem to be 12V, 10MHz, sine-wave units. Does anyone know if there are any other differences between them? Do any specific ones perform better than the others? There's a bit of a price difference between them, but data on Trimble OCXOs seems to be quite sparse (a bit like data on their GPS modules, really). Thanks, -- Phil. li...@philpem.me.uk http://www.philpem.me.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] Trimble OCXOs - 6525, ... and ...
On 07/06/2014 05:38 PM, Philip Pemberton wrote: Hi there, I've noticed a couple of Trimble OCXOs listed on that auction site. Specifically, model numbers: - 65256 - 49423 - 34310 C1 They all seem to be 12V, 10MHz, sine-wave units. Does anyone know if there are any other differences between them? Do any specific ones perform better than the others? There's a bit of a price difference between them, but data on Trimble OCXOs seems to be quite sparse (a bit like data on their GPS modules, really). Thanks, I bought a replacement OCXO for a Thunderbolt whose OCXO had died. The pinouts are different. The housing is much taller and won't fit in the Thunderbolt enclosure. The polarity of the VCO pin is different. That said, I was able to get the kluge to work by changing the polarity of the loop gain. -- Chuck Forsberg WA7KGX 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] Magnetic Resonance Spectrometer - redux
Thanks Brooke. I'll look into it. It would be interesting to try to develop a frequency standard from a test tube of water. Bob From: Brooke Clarke bro...@pacific.net To: Bob Stewart b...@evoria.net; Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Sunday, July 6, 2014 12:20 AM Subject: Re: [time-nuts] Magnetic Resonance Spectrometer - redux Hi Bob: This is very similar to a proton precession magnetometer that measures the total magnetic field, not in vector components. There's a lot of amateur designs for these that you could use as the bases for a MRS. There is an article in the same publication for a tube type frequency standard that can be used to drive a line powered wall clock. The Magnatron magnets were probably Alinco, so if you upgraded to modern magnets it might be much more stable. http://en.wikipedia.org/wiki/Proton_magnetometer http://en.wikipedia.org/wiki/NMR Have Fun, Brooke Clarke http://www.PRC68.com http://www.end2partygovernment.com/2012Issues.html http://www.prc68.com/I/DietNutrition.html Bob Stewart wrote: First, an apology. When I changed the topic on my original post, I thought that would be OK. Apparently that's still a thread-jacking. Sorry. I'm still interested in this Magnetic Resonance Spectrometer thing, though. On page 335 of the pdf linked below by Dave, there's an experiment with an MRS using water and the magnet from a magnetron available back then. Apparently the resonant frequency of hydrogen nuclei in water is 6.131325 MHz in that magnetic field. Did anyone ever pursue this with the idea of creating a frequency standard, or was the technology just too primitive at the time? Perhaps it's a repeatability problem from the magnetic flux standpoint? I can guess that temperature changes would cause enough of a flux strength change to cause a problem, but that's just a guess. Bob - AE6RV From: DaveH i...@blackmountainforge.com To: 'Discussion of precise time and frequency measurement' time-nuts@febo.com Sent: Saturday, June 28, 2014 1:09 PM Subject: Re: [time-nuts] Loran, GPS, Lightning, Timing A PDF of the 1960 book can be found here: http://www.sciencemadness.org/library/books/projects_for_the_amateur_scientist.pdf Dave ___ 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] Trimble OCXOs - 6525, ... and ...
some older models have higher phase noise, the very new ones are very good, sometimes they aged out the control voltage range, needing higher control voltage to pull to 10,000 MHz, some of them can not be pulled to the correct frequency any more without mechanical readjustment. They have inside a trim cap to set the tuning range, which is not accessible without opening the case.The case is hermetically closed. Some companies for very high performance units filling the hermetically closed case with nitrogen, also reducing the pressure of the filing gas bellow the atmospheric level. 73 KJ6UHN Alex On 7/6/2014 7:43 PM, Chuck Forsberg WA7KGX wrote: On 07/06/2014 05:38 PM, Philip Pemberton wrote: Hi there, I've noticed a couple of Trimble OCXOs listed on that auction site. Specifically, model numbers: - 65256 - 49423 - 34310 C1 They all seem to be 12V, 10MHz, sine-wave units. Does anyone know if there are any other differences between them? Do any specific ones perform better than the others? There's a bit of a price difference between them, but data on Trimble OCXOs seems to be quite sparse (a bit like data on their GPS modules, really). Thanks, I bought a replacement OCXO for a Thunderbolt whose OCXO had died. The pinouts are different. The housing is much taller and won't fit in the Thunderbolt enclosure. The polarity of the VCO pin is different. That said, I was able to get the kluge to work by changing the polarity of the loop gain. ___ 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.
