[Elecraft] CW Filter and Roofing Filter

[Guy Olinger K2AV]

Hi Robert,

K3(S) operators often set the DSP bandwidth to the roofing filter width
having bought the filter with operating at that bandwidth in mind. However
the DSP bandwidth is variable. As this is varied the radio will use the
roofer equal to or next larger than the DSP bandwidth.

Operating a K3(S) roofing filter and DSP with coinciding skirts produces
exceptional quick rejection of close interference, which is very useful
"running" in a contest, particularly on CW.

Hope this helps.

73, Guy K2AV

On Tuesday, June 23, 2015, <rclark01 at comcast.net> wrote:

> Hi all:
> I currently own a Yaesu FT-950 and am considering selling it to move the
> the Elecraft K3S line. My question is about filters. My FT-950 has a
> roofing filter and a variable CW filter down to 200hz. Quite frankly, I
> can't tell much different when I switch in the roofing filter but the
> variable CW filter makes a big difference. I also have a 1970's TenTen
> Century 21 which has a 500Hz filter that, to me, seems to do a better job
> than the FT-950. So..when I read that a 500 Hz roofing filter is an option
> for the Elecraft K3S, what am I actually reading? Could there be a 500Hz
> roofing filter and a 500Hz CW filter or are they the same? In several
> Youtube videos, I've seen operators using the variable width the filter
> signals. What am I seeing? Are they adjusting the roofing filter or the cw
> filter? And...is the cw filter variable (like my FT-950) or fixed (like the
> Century 21)?
> Thanks!
>
> Robert NJ4j
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