gil wrote:
Im trying to find info on a Kokusai Electric MF-4510AZ121 mechanical
filter.

Any ideas?

Cant seem to find anything on the net regarding this filter.

Sweep generator and a scope. Put something in, watch what comes out.

Odds are it's got a 455 KC passband, but if you sweep around 455 KC
and nothing comes out, try something wider.

If you don't have a sweep generator, even manually sweeping a signal
generator should let you see the center frequency and the filter width.

However, to find the output impedance, you want to add shunt resistance
to the thing until the passband looks nice and flat, and that is MUCH
easier to do with a sweep generator.

But those are really the only three things you care about: width, center
frequency, and output Z.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."