bandwidth is narrow, but width mite be adjusted, but you will lose the sharp
edge of the cutoff

perhaps use one of those excellent new active filter chips. add a few
capaciors and you have some really tight band filters with db drops near
60db!

http://www.circuitsage.com/filter.html



"**THE-RFI-EMI-GUY**" wrote in message
...
I need to filter noisy signal with a single frequency tone falling in
the pass band 67 to 250 Hz and am looking at using a 567 PLL or an
XR-215A or the like. It appears that the bandwidth of these are quite
narrow as they are usually used as tone decoders. Any suggestions? I
want to obtain as clean a tone out as possible.

The application is to regenerate a CTCSS tone. Simplicity counts!

--
Joe Leikhim K4SAT
"The RFI-EMI-GUY"©

"Treason doth never prosper: what's the reason?
For if it prosper, none dare call it treason."

"Follow The Money" ;-P