Re: [time-nuts] Hydrogen maser spin exchange

Ole I can only point you toward cesium references I remember reading about the magnet configuration and it did matter. Sorry it was a while ago. Others may know the reference. It was the HP 5060 as I barely recall. On Fri, Jun 17, 2016 at 6:18 PM, Ole Petter Ronningen

[time-nuts] Spin exchange tuning

Ole, Spin exchange tuning for a classic (non-autotuned) Maser is performed to put the cavity to the frequency that corresponds to the point that eliminates the frequency shift caused by changes in the Hydrogen flux. This enhances the short term stability at short time scales. This tunes the

Re: [time-nuts] Hydrogen maser spin exchange

There is indeed a quad- or hexa-pole state selection magnet between the dissociator and the cavity, required to select the atoms of the correct state to allow a population inversion resulting in oscillation. My understanding is that the spin-exchange of interest takes place between atoms already

[time-nuts] For all : Makes for interesting reading

_http://www.microwavejournal.com/articles/26593-m%C3%B6bius-metamaterial-ins pired-signal-sources-and-sensors_ (http://www.microwavejournal.com/articles/26593-möbius-metamaterial-inspired-signal-sources-and-sensors) Ulrich ___ time-nuts

Re: [time-nuts] Hydrogen maser spin exchange

Ole, Quite looking forward to the replies. Though no intention to own a maser currently. I thought there was a method of rejecting or reducing types of spin. Therefore reducing the impact you mention. Essentially a state selector. Pretty sure that thought will get corrected pretty quickly. Regards

Re: [time-nuts] GPS assisted 10 MHz frequency reference

This looks a lot like my initial GPSDO try. I didn’t create an account on that site, so I couldn’t look at the full schematics, but from the text description, it looks like they’re using 100 second sampling of whole cycle counts. This worked ok, but the addition of the phase discriminator

[time-nuts] Hydrogen maser spin exchange

Hi. Apologies for a long post. I'm trying to read up on the "care and feeding of hydrogen masers". While they are conceptually simple from a distance, there's quite a bit going on in the quantum mechanics department when looked at up close. Somewhat frustratingly, I am not mentally equipped to

Re: [time-nuts] Elektor GPSDO

Hi What he has done is best termed an FLL approach. A PLL is indeed a possible solution. Even with a FLL, he has quickly run into the fundamental problem of being able to measure the result. Without that, he is dead in the water. Optimization is the key next step. To do that you need data as

[time-nuts] Elektor GPSDO

Just throwing this into the lion's den. https://www.elektormagazine.com/labs/gps-assisted-10-mhz-frequency-reference ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and

[time-nuts] GPS assisted 10 MHz frequency reference

Elector Labs (Netherlands publisher), June 14,2016 GPS assisted 10 MHz frequency reference https://www.elektormagazine.com/news/build-a-high-precision-10-mhz-frequency-reference? -- Sent from iPad Air ___ time-nuts mailing list -- time-nuts@febo.com To

Re: [time-nuts] Improving on basic L1 timing

Hi Michael, Thanks, that plot and the info gives a useful comparison. I think in light of everything, doing some tests with a generally upgraded setup would be the way to go for now. There would actually be several rubidiums, although initially with a bit of cheating - 1 counter, a 10PPS

[time-nuts] TU60-D120-131 Specs....?

BTW, the Jupiter receivers have a command that can configure the 1PPS output to 100PPS. I got in some V.KSEL Sirf and Ublox receiver modules today and taught Lady Heather to speak SIRF binary. Kind of a waste... SIRF does not give give you any control over the 1PPS signal and the message

Re: [time-nuts] TU60-D120-131 Specs....?

Thanks, sounds like the TU60-D120 series has a completely different firmware numbering system than the TU30-140/410 in the link below. I ordered one and hopefully it will be fine. Suspect they are newer versions than the TU30's http://www.jrmiller.demon.co.uk/projects/ministd/frqstd0.htm