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 _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
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