On 4/10/20 2:31 PM, Richard (Rick) Karlquist wrote:
<snip>
At this time, I will give my usual speech about IMHO the fact that
since the invention of the DDS on a chip, EFC should no longer be used
for high performance oscillators.
Rick N6RK
Yes..
The only case I can think of is where the oscillator is being directly
multiplied up and one cannot tolerate the spurs from a DDS. There are
folks who believe that this is the case for generating the downlink
carrier in a deep space transponder.
However, I believe that even in that incredibly niche application, one
can design a DDS to have minimal spurs in the area close to the carrier.
In fact, just today, a transponder on Bepi Colombo makes a close
approach to Earth on its way to Mercury that implements just such a scheme.
I can conceive that there might be an application where the "move the
spurs around" approach wouldn't work or would be too complex.
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