[time-nuts] PLL question

Luis Cupido cupido at mail.ua.pt
Fri Aug 7 16:14:01 UTC 2009


Hi Dick,

'cause it may not integrate long enough...
'cause it may have poor phase noise...

;-)

(it is however a very good question though, as one must
be really sure what it does and then be motivated to improve it...)

Luis Cupido
ct1dmk.



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