Was this the paper you are referring to? tycho.usno.navy.mil/ptti/ptti99/PTTI_1999_405.PDF
On Fri, Apr 27, 2012 at 4:14 PM, Attila Kinali <[email protected]> wrote: > Moin, > > On Wed, 25 Apr 2012 20:45:54 -0400 (EDT) > [email protected] wrote: > > > > But.. is the CSAC not on the ITAR list? I would expect it to be, > > > as even some precision OCXO and a lot of MCXO are. > > > > This is the beauty, they are not ITAR or HAZMAT restricted! They > received > > approvals. > > Now THAT is really cool! > > > We just published an article about the CSAC GPSDO products we offer in > the > > Microwave Journal, April issue, and this is listed there as one of the > key > > advantages of CSAC's. > > Nice article, thanks! > > > > Oh.. the CSAC is that low power? I thought they are in the 1W region. > > > Good to know... > > > > Yes, CSAC itself rated at 115mW typical. They have a power down mode > with > > auto-correct of the TCXO that gets to less than 30mW on average. CSAC's > are > > game changers, and no one has anything even remotely comparable. > > They indeed are! > > > > I'm not quite sure about this. It would work if we had only to deal > with > > > one or two of devices, but with the numbers we need now, the work > would > > > probably cost more than a reel (i actually don't know what a reel > costs, > > > u-blox has not replied to my request for quotation i placed 3 weeks > ago). > > > > A reel will cost some real $$$ if you can get it, more than removing the > > shields from the units, even if you are doing say 100 units.. With a > proper > > heat gun, it takes only about 20 seconds to get the shield off, without > any > > damage to the unit itself. > > I just had a longer talk with a u-blox sales rep. Outcome is that they > do not sell the chips in volumes lower than 50k/year. Which means we cannot > use the chips to have easy access to the oscillator directly. Currently > they are trying to figure out, whether we're allowed to get information > about the LEA6-T module internas, so we can open the shield and replace > the TCXO. > > > > > The real question is, would a perfect 26MHz reference give you any GPS > > position performance improvement or not, that is what would be > interesting to > > test.. > > According to a paper which i currently cannot find, the use of a caesium > as "oscillator" for a standard timing gps module improved the noise of the > PPS quite a bit. > > Anyways.. i have to talk with the customer about this. I doubt that such > a major redesign will be possible in this revision (the devices have to > be ready by july), but it's definitly a good idea for the next version. > > Attila Kinali > > -- > The trouble with you, Shev, is you don't say anything until you've saved > up a whole truckload of damned heavy brick arguments and then you dump > them all out and never look at the bleeding body mangled beneath the heap > -- Tirin, The Dispossessed, U. Le Guin > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
