Re: [time-nuts] H-maser drift

2017-11-21 Thread Mike Cook
Thanks for that input John. > Le 21 nov. 2017 à 21:26, John Ponsonby a écrit : > . > 7. The RF discharge generates UV. This shines up the beam path and > illuminates the bulb coating in the region where the incoming atoms first > make contact with the bulb coating. This

Re: [time-nuts] H-maser drift

2017-11-21 Thread David Smith
gmail.com> Sent: Tuesday, November 21, 2017 12:26:35 PM To: time-nuts@febo.com Subject: Re: [time-nuts] H-maser drift There seem to be a lot of misunderstandings about H-masers. To set the record straight note: 1. The flow of hydrogen is generally controlled using a palladium membrane, though a pall

Re: [time-nuts] H-maser drift

2017-11-21 Thread Dana Whitlow
Thank you John. That was most informative. dana On Tue, Nov 21, 2017 at 2:26 PM, John Ponsonby wrote: > There seem to be a lot of misunderstandings about H-masers. To set the > record straight note: > 1. The flow of hydrogen is generally controlled using a palladium >

Re: [time-nuts] H-maser drift

2017-11-21 Thread John Ponsonby
There seem to be a lot of misunderstandings about H-masers. To set the record straight note: 1. The flow of hydrogen is generally controlled using a palladium membrane, though a palladium-silver alloy is to be preferred because it is less likely to crack. Only hydrogen will diffuse through the

Re: [time-nuts] H-Maser drift (was: Why discipline Rubidium oscillator?)

2017-11-21 Thread Ole Petter Rønningen
Hi, Dana. > What does 'EFOS' mean? I hadn't heard the term before. EFOS was a series of masers made by Oscilloquartz in Switzerland, there is a little information on my website www.efos3.com under «about». The manuals for those masers are also available, lots of good info for the interested:

Re: [time-nuts] H-Maser drift (was: Why discipline Rubidium oscillator?)

2017-11-21 Thread Bert Kehren via time-nuts
Corby can most likely answer some of these questions, since he also has a maser and does maintain it. He is right now most likely still asleep, California time. Bert Kehren In a message dated 11/21/2017 9:25:30 A.M. Eastern Standard Time, att...@kinali.ch writes: On Tue, 21 Nov 2017

Re: [time-nuts] H-Maser drift (was: Why discipline Rubidium oscillator?)

2017-11-21 Thread Attila Kinali
On Tue, 21 Nov 2017 14:50:48 +0100 Attila Kinali wrote: > The source for the Hydrogen atoms is usually a heated platinum > valve (a heated plate of platinum that is thin enough that the > Hydrogen will leak through). Several people pointed out that the valve is made of

Re: [time-nuts] H-Maser drift (was: Why discipline Rubidium oscillator?)

2017-11-21 Thread Dana Whitlow
Hi Ole, What does 'EFOS' mean? I hadn't heard the term before. I think I've heard the one-second lifetime figure before. I do hear mixed reports about where the conversion to atomic H occurs, and consider the jury to still be out on that question. I had thought that the volume of the storage

Re: [time-nuts] H-Maser drift (was: Why discipline Rubidium oscillator?)

2017-11-21 Thread Attila Kinali
On Tue, 21 Nov 2017 15:31:25 +0100 Ole Petter Ronningen wrote: > > Hehe.. Yes. It's "small" compared to the cavity. Depending on the > > exact cavity construction, the storage space can be as small as > > a tenth of the total cavity volume. > > Thats interesting, I would

Re: [time-nuts] H-Maser drift (was: Why discipline Rubidium oscillator?)

2017-11-21 Thread Ole Petter Ronningen
> > > > 4.5 liters in EFOS type masers - so not *that* small. I believe other > > masers are the same order of magnitude. > > Hehe.. Yes. It's "small" compared to the cavity. Depending on the > exact cavity construction, the storage space can be as small as > a tenth of the total cavity volume.

Re: [time-nuts] H-Maser drift (was: Why discipline Rubidium oscillator?)

2017-11-21 Thread Attila Kinali
On Tue, 21 Nov 2017 15:14:59 +0100 Ole Petter Ronningen wrote: > > [...] The advantage of the platinum valve > > system is that it "generates" single atom Hydrogen, as required > > by the maser. > > Picking nits here.. It was my understanding that the splitting of

Re: [time-nuts] H-Maser drift (was: Why discipline Rubidium oscillator?)

2017-11-21 Thread Ole Petter Ronningen
On Tue, Nov 21, 2017 at 2:50 PM, Attila Kinali wrote: > [...] The advantage of the platinum valve > system is that it "generates" single atom Hydrogen, as required > by the maser. Picking nits here.. It was my understanding that the splitting of molecular hydrogen into atomic

[time-nuts] H-Maser drift (was: Why discipline Rubidium oscillator?)

2017-11-21 Thread Attila Kinali
On Tue, 21 Nov 2017 04:24:51 -0600 Dana Whitlow wrote: > This is an active maser, meaning a self-sustaining oscillator whose gain > medium > was a volume of hydrogen atoms (at low pressure) maintained in a population- > inverted state by squirting a thin stream of