> -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] > Sent: Tuesday, November 11, 2008 9:28 AM > To: time-nuts@febo.com > Subject: [time-nuts] Checking the Frequency of a Rubidium Oscillator > > > 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?
Not a chance.. The signal is a PN code at about 1 Megachip/second, and the power spectral density is probably comparable to the thermal noise floor of the receiver. 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? All the satellites are at the same frequency, and they are CDMA (each satellite has a different PN sequence on its signal) _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
