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

[Don Wilhelm]

Steve,

The numbers displayed for the filter width are not necessarily the 
actual width of the filter.  The actual bandwidth depends on the 
particular combination of crystals and varactors in your K2.

Use Spectrogram to measure the actual width of your filter if you wish 
to have a precise bandwidth.

73,
Don W3FPR

Steve Kallal wrote:
> 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?
>
>