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Reason: To remove unwanted out of band signals.

Suggested implementation all units where possible.


how to:

Farhans method...

part needed 45mhz crystal filter (details to follow).

1. Remove R27
2. Solder the 45Mhz filter two extreme ends to the pads of the resistor.
3. Solder the center lead of the filter to the nearest ground. R13 is very near with a ground via.