[time-nuts] Symmetricom 023-63008-07 5MHz Crystal Oscillators

[Gerhard Hoffmann]

Am 23.01.20 um 19:12 schrieb Bob kb8tq:
> Hi
>
> If you do try it, double balanced mixers seem like the way to go.
>
> Two 5’s into one mixer gives you 10, a low level spur at 5 and some crud at DC.
> Duplicate that with another mixer and you have a second 10. Maybe go into a
> low Q filter to clean it up a little. Since you have loss in the mixers you will need
> some gain. At this point you have 4 OCXO’s running.
I had the idea to phaselock a bunch of MTI-260 very sloooowly to a common
master and then simply to Wilkinson-combine the outputs.  That won't help
long-time adev but phase noise. This was the original idea behind my 
carrier board.
I still have some GPS-less Lucents from that guy in FLA from some years 
ago. :-)

But the 260s are not good enough to justify the effort, simply buying
an ULN would be less ado.

At least two MTI-260 and also MV-89A on their carrier boards don't seem
to show a tendency to injection lock as far as I can tell  when I use them
as independent Timepod references, each just with 10-turn-pot tuning.

Gerhard, DK4XP