atomic clock / radio-receiver chip
> And portable thermonuclear bomb. Just in case. (Well, phone is already > hand interface to several orbital atomic clocks, isn't it?) the atomic clock(s) arent orbiting the earth, to receive the one in Colorado (or Hawaii, 3330 in Canada..), youd need some chip like Si4735 http://www.silabs.com/public/documents/marcom_doc/mcoll/Broadcast/Radio_Tuners/en/Si473x_Presentation.pdf their doc shows ipods, phones, and handheld PCs. has anyone besides the DSP-Rado people actually put this in _any_ product, let alone a phone? ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
Re: atomic clock / radio-receiver chip
On Sun, Jun 1, 2008 at 9:26 PM, cdr <[EMAIL PROTECTED]> wrote: >> And portable thermonuclear bomb. Just in case. (Well, phone is already >> hand interface to several orbital atomic clocks, isn't it?) > > the atomic clock(s) arent orbiting the earth, > But why there are no clocks at the orbit? They could be useful enough. E.g. if there are several of them each on predefined geostationary orbit we could do lots of useful things with them! For example, we could prove that general relativity indeed exists (although ionosphere would likely to spoil party at some degree). ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
Re: atomic clock / radio-receiver chip
On Sun, Jun 1, 2008 at 9:33 PM, Ilja O. <[EMAIL PROTECTED]> wrote: > On Sun, Jun 1, 2008 at 9:26 PM, cdr <[EMAIL PROTECTED]> wrote: >>> And portable thermonuclear bomb. Just in case. (Well, phone is already >>> hand interface to several orbital atomic clocks, isn't it?) >> >> the atomic clock(s) arent orbiting the earth, >> > > > But why there are no clocks at the orbit? They could be useful enough. > E.g. if there are several of them each on predefined geostationary > orbit we could do lots of useful things with them! For example, we > could prove that general relativity indeed exists (although ionosphere > would likely to spoil party at some degree). Huh, I'm a little confused about whats being spoken about here, but the GPS satellites are effectively giant orbiting atomic clocks, its the basis of GPS. Cheers, Federico ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
RE: atomic clock / radio-receiver chip
I have one (or something equivalent) in my watch (Casio Pathfinder Wave Ceptor). It synchronizes the time of my watch every night at midnight. /shrug --Tim -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of cdr Sent: Sunday, June 01, 2008 11:26 AM To: community@lists.openmoko.org Subject: atomic clock / radio-receiver chip > And portable thermonuclear bomb. Just in case. (Well, phone is already > hand interface to several orbital atomic clocks, isn't it?) the atomic clock(s) arent orbiting the earth, to receive the one in Colorado (or Hawaii, 3330 in Canada..), youd need some chip like Si4735 http://www.silabs.com/public/documents/marcom_doc/mcoll/Broadcast/Radio_Tune rs/en/Si473x_Presentation.pdf their doc shows ipods, phones, and handheld PCs. has anyone besides the DSP-Rado people actually put this in _any_ product, let alone a phone? ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
Re: atomic clock / radio-receiver chip
On Sunday 01 June 2008 21:33:15 Ilja O. wrote: > But why there are no clocks at the orbit? They could be useful enough. > E.g. if there are several of them each on predefined geostationary > orbit we could do lots of useful things with them! For example, we > could prove that general relativity indeed exists (although ionosphere > would likely to spoil party at some degree). > Or you could add a radio transmitter to each of the clocks in lower, almost circular orbits, and then use the differences between the times recieved from multiple orbiting atomic clocks to pinpoint your locations. You'd need a lot of them, though, probably something like 24 clocks in 3 orbital planes. OK, maybe you could get by with 21, if you beleived you don't need any spares. But naah, that would never work ;>. ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
Re: atomic clock / radio-receiver chip
cdr wrote: the atomic clock(s) arent orbiting the earth, Hey, According to wikipedia ( http://en.wikipedia.org/wiki/GPS ), every GPS satellite carries an atomic clock, providing every receiver on earth with really precise clock. The radio clock systems you describe are different and kinda useless when you have GPS onboard. As an engineer I'm stunned by the level of performance achieved of the GPS system : the description of Einstein's relativity compensation on the WP article is really scary :) -- Phyce ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
Re: atomic clock / radio-receiver chip
On Sunday 01 June 2008 21:33, Ilja O. wrote: > On Sun, Jun 1, 2008 at 9:26 PM, cdr <[EMAIL PROTECTED]> wrote: > >> And portable thermonuclear bomb. Just in case. (Well, phone is already > >> hand interface to several orbital atomic clocks, isn't it?) > > > > the atomic clock(s) arent orbiting the earth, > > But why there are no clocks at the orbit? They could be useful enough. > E.g. if there are several of them each on predefined geostationary > orbit we could do lots of useful things with them! For example, we > could prove that general relativity indeed exists (although ionosphere > would likely to spoil party at some degree). You could actually use it to calculate your position anywhere on the surface of the earth. Lets call it Global Positioning System (GPS). Really, what you describe here is exactly what GPS does, and you can indeed use GPS to get an acurate time... AVee -- You can tune a piano, but you can't tuna fish. ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
Re: atomic clock / radio-receiver chip
> Huh, I'm a little confused about whats being spoken about here, but > the GPS satellites are effectively giant orbiting atomic clocks, its > the basis of GPS. > > Hey, > > According to wikipedia ( http://en.wikipedia.org/wiki/GPS ), every GPS > satellite carries an atomic clock, providing every receiver on earth with > really precise clock. The radio clock systems > you describe are different and kinda useless when you have GPS onboard. > > As an engineer I'm stunned by the level of performance achieved of the GPS > system : the description of Einstein's relativity compensation on the WP > article is really scary :) Doh, people. You've spoiled all the fun! :( ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
Re: atomic clock / radio-receiver chip
Federico Lorenzi skrev: On Sun, Jun 1, 2008 at 9:33 PM, Ilja O. <[EMAIL PROTECTED]> wrote: On Sun, Jun 1, 2008 at 9:26 PM, cdr <[EMAIL PROTECTED]> wrote: And portable thermonuclear bomb. Just in case. (Well, phone is already hand interface to several orbital atomic clocks, isn't it?) the atomic clock(s) arent orbiting the earth, But why there are no clocks at the orbit? They could be useful enough. E.g. if there are several of them each on predefined geostationary orbit we could do lots of useful things with them! For example, we could prove that general relativity indeed exists (although ionosphere would likely to spoil party at some degree). Huh, I'm a little confused about whats being spoken about here, but the GPS satellites are effectively giant orbiting atomic clocks, its the basis of GPS. Cheers, Federico ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community Indeed they are: http://en.wikipedia.org/wiki/Global_Positioning_System (under Simplified method of operation). And if the satellites did not take the relativity theory into account, they would be useless. The accuracy would be awful. http://en.wikipedia.org/wiki/Global_Positioning_System#Relativity Arne K ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
Re: atomic clock / radio-receiver chip
IHMO, Doris and Poséidon precision is also pretty astounding, albeit not so well-known ( http://en.wikipedia.org/wiki/DORIS_(geodesy) . Rodolphe Le dimanche 01 juin 2008 à 23:04 +0200, Philippe Guillebert a écrit : > cdr wrote: > > the atomic clock(s) arent orbiting the earth, > > Hey, > > According to wikipedia ( http://en.wikipedia.org/wiki/GPS ), every GPS > satellite carries an atomic clock, providing every receiver on earth > with really precise clock. The radio clock systems you describe are > different and kinda useless when you have GPS onboard. > > As an engineer I'm stunned by the level of performance achieved of the > GPS system : the description of Einstein's relativity compensation on > the WP article is really scary :) > > ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
