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

Christophe Huygens Christophe.Huygens at cs.kuleuven.ac.be
Tue Feb 2 16:16:37 UTC 2010

Hello Francesco:
you can use my xlock, http://www.qslnet.de/member/on4iy/xlock/xlock.html
You will have to add a varicap to make the XO into a VCXO.
There should not be any noticable noise increase due to the PLL - make
sure you use a good reference 10MHz in yr GPSDO!

73 xtof on4iy

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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