[Elecraft] Re:Discrete Passband Tuning Revisited

[Brian Mury]

On Tue, 2004-07-12 at 13:40 -0500, W3FPR - Don Wilhelm wrote:
> go to passband tuning with FL2, 3 and 4 with a 400 Hz filter width;
> center FL2 at 650 Hz, FL3 at 750 Hz, and FL4 at 550 Hz (assuming a 600
> Hz sidetone).  That should allow a normal 400 Hz filter for crowded
> band use (FL2) plus the ability to drop a lower pitched interfering
> signal out with FL3 and a higher frequency interfering signal out with
> FL4.  Turn the centering for FL3 and 4 around if you want to drop off
> the high end first and the low end with FL4. 

Neat idea.

Couldn't you do the same thing with a single filter by using the RIT?
The pitch of the desired signal would, of course, change, but that's not
a big deal. Then you can still have 4 different filter widths.

-- 
73, Brian
VE7NGR