On 12/8/15 3:31 PM, Bob Camp wrote:
Hi
Let’s see:
EFC uses reference out of the OCXO.
EFC comes on the OCXO at no added cost.
16 bit DAC costs ~$2 to $5
Total cost for EFC setup $2 to $5. Net result is a system with
spurs that are how ever far down you wish them to be. (It’s all
about grounding in this case).
Bob
If the OCXO has steering, the Q of the resonator has to be lower than if
the OCXO wasn't steerable.
So conceivably (if such things were available) you could get a
non-steerable OCXO with better (very) close in noise.
And then move the frequency with the DDS. It's fairly straightforward
to make a DDS circuit that pushes the spurs and such away from the
carrier (at the expense of higher noise farther out).
But hey, that's brand new and exotic.
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