John,
I have either 2.8 or 2.7 KHz filters in my K3s; I just don't
remember which I ordered. I rely on the bandwidth of the filter that
follows which is created by DSP. It works fine for me. I know this setup
has stop bands that are around 105 db, but I don't know what the shape
factor is; some of this is available from Bob Sherwood's site.
The filters you are discussing are roofing filters. They are
primarily there to protect the the ADC from seeing too much energy and
overloading. Selectivity is secondary. Unless you perceive that you are
having a problem, I wouldn't go to the trouble of swapping out filters.
However, there are a number of hams who will disagree with me.
73,
Barry
K3NDM
------ Original Message ------
From: "Gary Hunt via Elecraft" <elecraft@mailman.qth.net>
To: elecraft@mailman.qth.net
Sent: 3/31/2020 2:55:44 PM
Subject: [Elecraft] Subject: K3 SSB filters
Subject: [Elecraft] K3 SSB filters
Message-ID: <6337fc8e-6d4b-5a8e-1e3c-c45e1ecde...@pinewooddata.com>
Content-Type: text/plain; charset=utf-8; format=flowed
With the recent experience in SSB? contests, I'm thinking of upgrading
my SSB filter(s). Currently for SSB I have only the 2.8 filter. What are
thoughts about other SSB filters? I know when I narrow the bandwidth to
1.8 the intelligibility goes down.
-de John NI0K
John, when narrowing the SSB bandwidth down to 1.8 use the shift control also
and shift from 1.5 down to wards 1.05 or so. Makes a big difference. I'm sure
a MACRO could be set up to do that automatically but I don't find it necessary
often enough to worry about.
73,Gary KC9EE
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