[Elecraft] Yet another filter question

[Joe Subich, W4TV]

> there isn't much difference between the two [400 Hz and 250 Hz]
> filters,

Correct.  There is much debate but in my opinion the difference is
not worth the cost of both filters.

> based on this data alone it would seem that the better choice would
> be to go with the 200hz 5-pole.

Even though the 200 Hz filter has a broader shape factor, comparing
selectivity curves of the 200 and 250 Hz filters shows that the 200 Hz
filter is tighter than the 250 Hz filter until the skirt response is
down nearly 50 dB.  My decision was to pair the 200 Hz with the 400 Hz
filter.

73,

   ... Joe, W4TV


On 2015-05-15 12:33 PM, Morgan Bailey, II wrote:
> Hi all
>
> I apologize if this topic has been covered here before.
>
> I've had my K3 for about a year now, and I'm considering adding another
> roofing filter.  I currently have the 400 hz 8 pole filter and it has
> served me very well, but there were several instances during the 2014 WPX
> cw contest as well as 2014 SS where I needed something tighter.  I've seen
> the filter plots for the 5 pole and 8 pole filters, and while my initial
> gut feeling was to go with the 8 pole 250 hz filter, I'm now questioning
> whether or not that would be wise.  According to the plots, there isn't
> much difference between the two filters, and based on this data alone it
> would seem that the better choice would be to go with the 200hz 5-pole.
>
> I'm sure I'm missing something here.
>
> Thoughts?
>
> Thanks
>
> 73, Morgan, NS0R.
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