If you don't need the 26 and 19.2 to be exactly phase locked to the
10, and you can find crystals at those frequencies, I would suggest
that you go straight digital. There are a number of simple divide,
mix, multiply, and filter combinations that would make those
frequencies directly. The main thing is to not have to multiply up
too high to get the desired mixer products, versus how well your
filters have to work.
For example, if you divide the 10 MHz by 5 to make 2, and XOR mix
them, you'll have 8 and 12 available, both standard crystal
frequencies. The 8 can be filtered out with a crystal filter (but the
phase info may be lost) and then XOR doubled to 16, another standard
crystal frequency, filtered out and mixed with the 10 to get 26. The
16 can be divided by 5 to make 3.2, also standard, filtered out and
mixed with the 16 to make 19.2. It may even be possible to skip the
intermediate filtering steps if you have very good output filters -
it depends on how clean they need to be further out from the carrier.
You would of course have to make sure that the components have
sufficient phase noise performance, and you would have to design the
crystal filters - possibly multi-staged, and protected from thermal
and vibration effects enough for the stability time range needed.
Ed
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