[Elecraft] K3 Filter advice...

[David Yarnes]

Drew and All,

I'll take a stab at giving you an answer.  For AM reception (and shortwave) 
you would want the 6 khz filter.  For CW, you need to make a choice, but I 
suspect that in order to limit the number of filters you would be best 
advised to select either the 400 hz or 500 hz filter.  You can look at the 
graphs to see which has the characteristics you prefer.  I have the 400 hz 
and the 200 hz filters.  Most of the time I use the 400 hz, and only invoke 
the 200 hz filter when things get really tough.  But I'm glad I have the 
narrower filter.  However, if I only had one CW filter I would probably opt 
for the 400 hz.  I am very pleased with how the 400 hz filter works and 
sounds.  I think I saw someone suggest the 500 hz would be a better choice, 
but I'm not sure I remember why.  Personally, I want the narrower filter for 
those occasions when you need just a little tighter bandpass.  Besides, I 
don't find using the 400 hz filter to be unpleasant at all, so I don't think 
I would necessarily be better served with a 500 hz in the alternative.  I 
suppose you might find the 500 hz filter to be sufficient, when combined 
with the K3's DSP capabilities, but I think you would actually have to do 
some "hands on" to be sure you like the result.

O.K.  That's my answer.  I bet you get several others.

Dave W7AQK

----- Original Message ----- 
From: <drewko1 at verizon.net>
To: <Elecraft at mailman.qth.net>
Sent: Wednesday, December 26, 2007 8:36 AM
Subject: [Elecraft] K3 Filter advice...


> I'm wondering what minimum complement of filters would work for me in
> a K3. I am only interested in general coverage reception of SWBC
> stations, plus operating CW. I am a little unlclear about what filter
> would be required for AM (reception only), with the KBPF3 option.
>
> For CW I generally prefer a wide filter (my K2 is set at 2.0 kHz most
> of the time). I suppose I would want a narrower filter as well but
> can't decide whether 500/400 or 250/200.
>
> Does a 2.1 kHz + 200 Hz filter pair seem like a useful combo for CW?
>
> Finally, I don't have a clue what noticeable difference there would be
> between a 200/5-pole and a 250/8-pole. If the difference is really
> subtle or limited to very occasional use I suppose I'd go for the
> cheaper one.
>
> 73,
> Drew
> AF2Z
>
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