FILTER SETTINGS - Correction

[Bill W4ZV]

I wrote:
 >the 500 Hz will adequately reject a
signal at 1092/2 = 546 Hz versus the 400 at 873/2 = 436 Hz
or a difference of only ~100 Hz from the center
frequency...which could easily be taken care of in
extreme cases by using SHIFT.

         Oops...inserted a wrong number in there...should be:


the 500 Hz will adequately reject a
signal at 1092/2 = 546 Hz versus the 400 at 647/2 = 323 Hz
or a difference of ~220 Hz from the center frequency,
which might NOT be handled by using SHIFT.  Of course
most strong signals at 323 Hz spacing will have clicks
and phase noise swamping out any advantage...unless
it's another K3 or Orion!  :-)

                                         73,  Bill  W4ZV

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[Bob Cunnings NW8L]

That's where the better shape factor hits home. For the 1 kHz filter,
with -30dB BW of 1400 Hz, we have adequate rejection at 1400/2 = 700
Hz, versus the 5-pole 500 Hz at 1092/2 = 546 Hz, a difference of only
154 from the center frequency. Not a bad single filter choice for for
CW ops like me who aren't serious contesters, and are interested in
using the context filter.

Bob NW8L

On Dec 11, 2007 9:44 AM, Bill Tippett <[hidden email]> wrote:

>
> the 500 Hz will adequately reject a
> signal at 1092/2 = 546 Hz versus the 400 at 647/2 = 323 Hz
> or a difference of ~220 Hz from the center frequency,
> which might NOT be handled by using SHIFT.  Of course
> most strong signals at 323 Hz spacing will have clicks
> and phase noise swamping out any advantage...unless
> it's another K3 or Orion!  :-)
>
>                                          73,  Bill  W4ZV

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