[Elecraft] K3: KFL3C-200 filter

[N2TK, Tony]

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

-----Original Message-----
From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Eric
NO3M
Sent: Wednesday, November 30, 2016 12:01 PM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] K3: KFL3C-200 filter

I find the 200Hz filter most useful to knock down adjacent QRM, ie. 
during crowded contest conditions, not so much dealing with QRN. Try opening
up the bandwidth to 500-700Hz when QRN is bad.  The brain generally does a
better job discerning a weak signal when there is more noise bandwidth, but
of course, depends on the operator.  APF doesn't seem particularly useful on
very weak signals when a certain amount of QRN is present either.

I had decent copy of 8Q7SP on QSB peaks on 160M last night with the
bandwidth set at 550Hz... no chance with anything much narrower.

73 Eric NO3M

On 11/28/2016 06:39 PM, N2TK, Tony wrote:
> Tnx Ian,
> On 80 and 160M this past weekend had the filter bandwidth set at 200HZ
most of the time due to the QRN. The NR helped a little. Just trying to find
out if worth the money to buy the new 200 HZ filter if I would really know
the difference.
>
> 73,
> N2TK, Tony
>
>

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