[Elecraft] K3: KFL3C-200 filter

[N2TK, Tony]

I think we are talking about different types of QRN. This evening the noise
level is way down. My Pennants seem to be quite directive. Of course the
W1FV array still does not work. The BOG is hearing quite well but no
directivity at 220'. Will try shortening it. I was chatting with AA1K a
little while ago. He does quite well down in DE with his array of receive
and transmit antennas on 160M. He was saying weird propagation and noise
this past weekend too on 80 and 160M.
Oh well, probably see more of this with the low sunspot numbers. SW3LPL had
a good explanation of this the other day.

73 
N2TK, Tony

-----Original Message-----
From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Eric
NO3M
Sent: Wednesday, November 30, 2016 2:13 PM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] K3: KFL3C-200 filter

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
>
>

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