[Elecraft] K2 filter bandwidth versus real bandwidth...

[Steve Kallal]

I've set up my K2 with the following bandwidths for the RTTY mode:
 
FL1    OP1
FL2    1000 Hz
FL3    500 Hz
FL4    250 Hz

I am listening to an Olivia signal (a digital mode) with a 500 Hz bandwidth.
I would expect FL3 at 500 Hz to pass the whole signal. Instead I have to
select FL2 at 1000 Hz bandwidth. Looking at the waterfall for the Olivia
signal, I get about 750 Hz passed rather than 1000 Hz.

If I want to pass a 500 Hz signal, what bandwidth should I select in the
filter calibration? I guess the selected bandwidth isn't measured at 6 db
down, or is it?

73,

Steve N6VL