[Elecraft] Let's Try This Again -- was "[K3] ... A 750 Hz, 8-Pole ... Filter?"

[Duncan Carter]

As I wrote in an earlier post, the 250 Hz filter skirts are 
assymetrical, at least mine is.  On one side, they are about right for 
using a 250 Hz dsp setting but on the other side, they are wider.  You 
may also benefit from tweaking the filter center frequency which you can 
do using the configuration utility; my 250 Hz filter Freq. Offset 0s-s 
set at -.04 but you best setting may likely be something different; yes, 
it's nit-picking but what else is an old geezer to to when the bands are 
dead.   Usually, best/least ringing response is obtained with the filter 
centered as best possible but you can also listen to noise.  I usually 
set the default width for my 250 Hz filter at 200 Hz and the default 
center frequency of the 500 Hz filter at 450 Hz which gives a slight 
improvement in ringing response at 200 Hz and 450 Hz by getting the 
filter corner frequencies further down the dsp skirts; most of the time 
I just use either of these two default frequencies as I can toggle 
between them and the 1.8 KHz with  the XFIL button.

Dunc, W5DC

Radio Amateur N5GE wrote:
> On Wed, 14 Jul 2010 12:01:30 -0700 (PDT), Bill W4ZV
> <btippett at alum.mit.edu> wrote:
>
> I second that.  I wonder why they don't label them as the width they
> really are?
>
> Tom, N5GE
>
> K3 #806 with SUB RX, PR6, 
> KRC2 and K144XV
> K3 #1055 with PR6 and XV432
> W1, 2 W2's and other small kits
>
> QCWA Life Member 35102
>
> n5ge at n5ge.com
> http://www.n5ge.com
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>
>   
>> I'd be interested in a **true** 6 dB BW 8-pole for 200-250 Hz (Inrad's "250"
>> is actually 370 Hz BW and I don't want that).
>>
>> 73,  Bill
>>     
>
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