Gleaned from the NavSync site: "... The CW12-TIM has an on-board programmable NCO oscillator that outputs a synthesized frequency up to 10 MHz that is steered by the GPS receiver. ..."
"...A Rose by any other name ..." 73, Dick, W1KSZ -----Original Message----- >From: Ed Palmer <[email protected]> >Sent: Aug 7, 2009 9:52 AM >To: Discussion of precise time and frequency measurement <[email protected]> >Subject: Re: [time-nuts] PLL question > >Navsync doesn't really call it a synthesizer, they call it a Numerically >Controlled Oscillator (NCO). My tests suggest that they're doing what >others have done on the 1 PPS output - change the state of the 10 MHz >output (high to low or vice versa) on a transition of their internal 120 >MHz clock. This means that you occasionally get a pulse that's ~8 ns >shorter or (presumably) longer than normal. My unit puts out a short >pulse about 200 times per second. Navsync has an app note where they >say that for some applications a phase-locked cleanup oscillator will be >required. > >Ed > >Richard W. Solomon wrote: >> Dumb question time: >> >> If the NavSync has an on-board synthesizer locked to GPS, why do >> you need to lock that to another oscillator ?? >> >> 73, Dick, W1KSZ >> >> -----Original Message----- >> >>> From: gonzo moto <[email protected]> >>> Sent: Aug 7, 2009 1:32 AM >>> To: [email protected] >>> Subject: [time-nuts] PLL question >>> >>> >>> >>> >>> >>> >>> >>> >>> Hi Guys, >>> I'm in the process of building a GPSDO which started out life based on >>> G3RUH's design, but suffered a bit of feature creep. >>> >>> The GPS I'm using is the NavSync CW12, so I'll run the Freq_Out at 10MHz. >>> I'm wondering if I should run the PLL at 10MHz or if there is an advantage >>> dividing the two signals down to (say)10KHz. >>> Does the averaging at 10kHz (and introduced errors of the dividers) >>> outweigh the 'no averaging' and no additional errors syncing at the >>> fundamental freq? >>> I can think of arguments each way, but lack the test equipment to prove >>> either way. >>> >>> Suggestions would be appreciated. >>> >>> Regards, >>> ian >>> >>> _________________________________________________________________ >>> View photos of singles in your area Click Here >>> http://a.ninemsn.com.au/b.aspx?URL=http%3A%2F%2Fdating%2Eninemsn%2Ecom%2Eau%2Fsearch%2Fsearch%2Easpx%3Fexec%3Dgo%26tp%3Dq%26gc%3D2%26tr%3D1%26lage%3D18%26uage%3D55%26cl%3D14%26sl%3D0%26dist%3D50%26po%3D1%26do%3D2%26trackingid%3D1046138%26r2s%3D1&_t=773166090&_r=Hotmail_Endtext&_m=EXT >>> _______________________________________________ >>> 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. >> >> > >_______________________________________________ >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.
