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, [email protected] (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, [email protected] (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.
-------------------------------------------------------------------------------------
Bill Frantz | Government is not reason, it is not
eloquence, it is force; like
408-356-8506 | a fire, a troublesome servant and a fearful
master. Never for a
www.pwpconsult.com | moment should it be left to irresponsible
action. Geo Washington
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