[Elecraft] Advice on Additional Roofing Filters for K3

[Frank W3LPL]

400 Hz plus DSP is all we ever use at W3LPL
Some my K3s have the rare 700 Hz filter

On SSB we use wither the 2.1 or 2.8 kHz filter
I sold all of my 1.8 and 2.7 kHz filters

73
Frank
W3LPL

----- Original Message -----
From: "Elecraft" <elecraft at mailman.qth.net>
To: "Elecraft" <elecraft at mailman.qth.net>
Sent: Wednesday, December 24, 2025 8:34:59 PM
Subject: Re: [Elecraft] Advice on Additional Roofing Filters for K3

I have a 200 in mine, and I never need it. Period. The 400 plus DSP is 
all that I've ever needed for CW.

73,
Victor, 4X6GP
Rehovot, Israel
Formerly K2VCO
CWops no. 5
http://www.qsl.net/k2vco


On 24/12/2025 18:43, Tom Bowles via Elecraft wrote:
> Hello all,
> 
> I recently acquired a K3 that came with the standard 2.7 kHz and a 500 Hz roofing filters installed (no subrx). I mostly operate CW, SSB, and sometimes RTTY contests, and I'd like to round out my filter set for better performance in crowded bands.
> 
> I'm considering adding a 1.8 kHz for SSB and a 250 Hz for CW, but I've read that the 250 Hz filter often measures wider in practice (around 330-350 Hz) and may not be as sharp as expected. Has anyone experienced this, and would you recommend it, or suggest alternatives like the 200 Hz or 400 Hz instead?
> 
> 73,
> Tom KE5CW
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