[time-nuts] PLL question

Ed Palmer ed_palmer at sasktel.net
Fri Aug 7 16:44:42 UTC 2009


Which software version do you have, NMEA or Motorola?  If you have the 
NMEA version another question pops up:  Should you do the division 
externally, or program the unit to directly put out the lower frequency?

Ed

gonzo moto wrote:
> 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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