[Elecraft] K3: KFL3C-200 filter

[Eric NO3M]

We may also be referring to different types of QRN.  I have almost zero 
local noise, the transmit antenna is usually about S1 midday and on 
quiet nights, S2-3 at night.

Locally generated QRN is generally more even and narrow filtering may be 
beneficial in that case.  Propagated QRN, which is what I mainly hear, 
is more erratic, with bursts and inconsistent behavior, where wider 
bandwidths seem to benefit.  As Jim points out, there is science behind 
it, but I also think the inherent phase distortion and how it is 
processed / handled by the brain may be a function of the individual to 
some extent.

73 Eric NO3M

On 11/30/2016 01:28 PM, N2TK, Tony wrote:
> Eric,
> I agree and open up the bandwidth when there isn't strong adjacent signals,
> especially with the upper bands. But on Topband I do seem to hear better in
> the QRN with the filter narrowed down to 200HZ.
> I do wonder why the difference we both see on Topband with you using a wider
> setting and I am using a narrower setting? Maybe you have better receive
> antennas?
> I only have a couple Pennants, a short 3-el vert inline array that I can't
> get working well and a BOG. I haven't optimized the length yet on the BOG.
> But so far it hear fairly well. I sure do miss my long beverages when I
> lived in Joisey.
>
> 73,
> N2TK, Tony
>
>