[time-nuts] PLL question

Richard W. Solomon w1ksz at earthlink.net
Fri Aug 7 14:23:40 UTC 2009


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 <cadbloke at hotmail.com>
>Sent: Aug 7, 2009 1:32 AM
>To: time-nuts at febo.com
>Subject: [time-nuts] PLL question
>
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>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
>
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