[time-nuts] GPS Crystal Frequencies

Azelio Boriani azelio.boriani at gmail.com
Tue Oct 27 07:12:18 EDT 2015

Usually GPS receivers have CPU clock frequencies that are not an
integer multiple of the chipping rate: that's why there is the
sawtooth correction in the timing units. The LO frequency for the
receiver front-end is not a problem due to the fractional-N PLL. The
Motorola M12 seems to use a 40MHz clock, uBlox receivers use 48MHz

On Tue, Oct 27, 2015 at 3:06 AM, Brooke Clarke <brooke at pacific.net> wrote:
> Hi:
> I understand 10.230 MHz since when multiplied it gives 1176.45,1227.60,
> 1381.05 & 1575.42 MHz, all GPS carrier frequencies.
> http://www.prc68.com/I/DAGR.shtml#GPSs
> But I've got a number of GPS receivers that have Rakon unit oscillators with
> a frequency of 10.949297.
> http://www.prc68.com/I/DAGR.shtml#Polaris_Link
> What's the story?
> PS I'm looking for documentation on the Polaris Link (civilian) GPS board.
> Mail_Attachment --
> Have Fun,
> Brooke Clarke
> http://www.PRC68.com
> http://www.end2partygovernment.com/2012Issues.html
> http://www.prc68.com/I/DietNutrition.html
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