[Elecraft] K3 filter options

[Joe Subich, W4TV]

Like Dave and Jim I would recommend 2.7/1.8/400/200 along with
a 13 KHz (FM) filter if needed.

I have tried the 1.5 KHz narrow SSB filter and find to too tight
in nearly all conditions ... the 1.8 KHz will be used more often
and the 1.5 provides very little added benefits in really crowded
conditions.

I find the 400 Hz filters (measured bandwidth 420 - 450 Hz) to
be significantly better than the 500 Hz, 5 pole filters (measured
480 to 490 Hz) and the 200 Hz filter is a useful "narrow" filter
when needed compared to the "250 Hz" filter which measures more
than 350 Hz at the - 6dB points.

With 2.8/1.8/400/200 Hz, my only wish is that there were three
more slots or at least that I could use the 13 KHz filter for
AM and ESSB transmit (without resorting to calling the 13 KHz
filter a 6 KHz filter).

73,

    ... Joe, W4TV

On 1/3/2011 3:51 PM, Jim Brown wrote:
> On 1/3/2011 12:27 PM, Dave Hachadorian wrote:
>> I have settled on 2.7, 1.8, and 250.
>
> That would be my first choice as well.  I started with 2.7, 1.8, and
> 400, then added 250.  In a CW or RTTY  contest, I wouldn't be without
> 400 or 250. I mostly run the IF between 400 and 200. A 1.8 roofer is
> simply too wide for CW, and there are times when 250 is too narrow.
>
> I have never heard a 2.1 roofer in a K3, so can't comment on that.
>
> 73, Jim
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