I'm looking for a circuit design to a CW filter centred around 1khz that's
about 200hz wide and then rolls off very rapidly.

I'm planning to build a AFC system for SSB, which has a 1khz pilot tone that
will be used to lock the frequency correct.

I then need a circuit with quite a tight notch around 1khz to kill off the
pilot tone once it's been locked on, so you don't have an annoying whistle
on the reciever.


Can anyone possibly help with any circuit designs or where I can find
some????

I've had a look at a twin tee filter, but I'm not familiar with this design.
Would this be suitable, is it worth me reading more about it and learning,
then using this?


Thanks all,

Sam