[time-nuts] GPS Crystal Frequencies

paul swed paulswedb at gmail.com
Tue Oct 27 11:27:16 EDT 2015

An interesting question and like you I have seen the odd frequencies.
For the 10.230 MHz since they come out exactly at the carrier frequency
that would tend to speak to a direct conversion receiver.

At least on the much older receivers that had IF stages at either 75 Mhz or
35 Mhz and therefore some other frequency would be needed. (There could
also be a very wide range of IF frequencies besides the two I mention.) I
will guess the 10.9 Mhz is exactly that when multiplied up either comes up
high or low by the IF frequency offset they wanted.

On Mon, Oct 26, 2015 at 10:06 PM, 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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