> Are there any Collins mechainical filters for 9 mhz?
>
I suspect not.
Mechanical filters use a electromechanical transducer, which may be like
a speaker voice coil or a piezoelectric device, to convert the IF
electrical signal to a mechanical motion. The mechanical "signal" is
propagated through a series of resonant (mechanically) disks, and then
converted back to an electrical signal using another electromechanical
transducer. In order for the mechanically resonant parts to have a
resonance at 9MHz, versus 455kHz, they would have to be really tiny.
Maybe numerically controlled machining or nanotechnology has gone here.
As far as I know Collins mechanical filters work only in the sub MHz range.
DE N6KB
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