[time-nuts] OT: Practical PLL low noise?

Luis Cupido cupido at mail.ua.pt
Wed Feb 3 01:59:11 UTC 2010


Frank,

You might want to take a look in here also.
Hardly gets any simpler than this ;-)

http://w3ref.cfn.ist.utl.pt/cupido/reflock.html

Luis Cupido
ct1dmk.


> On 02/02/10 16:50, francesco messineo wrote:
>> Hello all,
>> sorry for the OT, but I know there're many real electronic artists here.
>>
>> As an amateur radio operator I often use transverters, some home made.
>> They usually can be made sigthly better (RF and noise-wise) than
>> japanese transceivers. However often the LO xtal oscillator drifts too
>> much for comfortable digital and weak signal work.
>> Now the big question: is there any PLL design that can lock 22 MHz and
>> 42 MHz xtal oscillator to a 10 MHz reference (typically from a GPSDO)
>> without adding significant noise to the oscillators? The LOs usually
>> go to a single or doube balanced diode mixer like the famous
>> minicircuit ones, and at that point the RF signal has been already
>> amplified by 10 or 20 dB stage(s).
>> Other options would be "ovenizing" the LOs or making a DDS sinth.
>> Now, what would be more practical approach from the home construction 
>> point?
>> Thanks
>> Frank IZ8DWF
>>
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