Hi Bruce: It's my understanding that if you look at the signal from a common GPS antenna and feed it into a spectrum analyzer you will not see the signal. My guess is that when developed by the military it was designed to be a stealth system. GPS is what's called a Spread spectrum signal.
Also the best possible s/n radio is determined by how orthogonal the different PN codes are to each other. These are described in ICD-GPS-200 which is on line at: http://www.navcen.uscg.gov/gps/geninfo/ along with other GPS info. Here's a National Instruments page about GPS signal generation: http://zone.ni.com/devzone/cda/tut/p/id/8015 The definitions on this page for the various Time To First Fix flavors may not be accurate. Have Fun, Brooke Clarke http://www.prc68.com [EMAIL PROTECTED] wrote: > > I have an EIP Model 548 counter with a YIG-tuned front end that can be > programmed to scan over narrow frequency ranges. By feeding the rubidium > oscillator under test into the 10 MHz clock input of the counter, is there > any > reasonably simple way to directly measure the frequency of a GPS satellite > transmission so as to ascertain the accuracy of the rubidium source? The > counter has > an input sensitivity in the order of about –25 dBm -- not sufficient to > measure directly from an amplified antenna, but perhaps through an > amplifier. I > am not sure whether the input YIG tuner selectivity is sufficient to > separate > transmissions from the various satellite’s (or are they TDMS?). What do you > think? > Bruce, KG6OJI > **************AOL Search: Your one stop for directions, recipes and all other > Holiday needs. Search Now. > (http://pr.atwola.com/promoclk/100000075x1212792382x1200798498/aol?redir=http://searchblog.aol.com/2008/11/04/happy-holidays-from > -aol-search/?ncid=emlcntussear00000001) > _______________________________________________ > 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.
