[Elecraft] Planning the next filters

[Bill Frantz]

I am a all-band, all-mode operator. I contest, chase DX, and 
just make contacts.

I have something close to what you are considering. I have 250, 
2.1K, 2.7K, and 13K filters in both my main and sub receivers. I 
got the 250 for eliminating loud PSK signals from wiping out 
weak ones. It was a bunch of playing with center and width, but 
worked quite well.

I also use the 250 on CW, sometimes narrowing the DSP bandwidth 
to 50 Hz to minimize noise, or nearby QRM when listening to a DX 
station. In a DX chase, hopefully the DX will have a bit of 
spectrum all to its own, but with DQRM and people tuning up on 
the DX frequency, narrow bandwidth can be very useful. If the DX 
frequency is clear, the Audio Peaking Filter can work better 
than the 50 Hz DSP bandwidth in reducing noise.

Joe is making me tempted to replace the 250s with 200s -- I've 
had problems in contests with nearby strong stations.  Jim makes 
an good argument for the 2.8K ones for cleaner digital transmission.

As you may have noticed, the filter configuration is a highly 
individual choice. With the DSP as good as it is, you should 
have fine performance whichever way you choose.

73 Bill AE6JV

On 3/8/18 at 8:22 AM, chandlerusm at gmail.com (Chuck Chandler) wrote:

>I plan on a 250 Hz CW filter, but am going back and forth between the 2.1
>and 1.8 kHz filters.  I know that narrowing the DSP to 1.8 gives a really
>difficult to understand voice signal, while the 2.1 allows in more adjacent
>signals.  However, the roofing filters may not behave in the same manner.
>For example, the 1.8 could be set to turn on at 2.1 to take advantage of
>skirt shape.
>
>I primarily DX, and operate in some contests as well.  I know SSB contests
>really need a narrow SSB filter.
>
>Any suggestions on the matter from those who have gone this route before?
>
>73 de Chuck, WS1L
>


On 3/8/18 at 9:32 AM, lists at subich.com (Joe Subich, W4TV) wrote:

>... If you feel you *need* a narrower filter in the 8215 KHz IF,
>consider the new KFL3C-200 which is truly 200 Hz wide at -6 dB.
>See: <http://www.elecraft.com/K3/K3_filter_plots.htm> particularly the
>last graph.

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