Mark,
Where did you find the utility? I just search the web and the
Elecraft site for the utility, but it never showed up.
73,
Barry
K3NDM
------ Original Message ------
From: "Mark Forsyth" <vk3...@outlook.com>
To: "Grant Youngman" <ghyoung...@gmail.com>
Cc: "Elecraft Refl" <Elecraft@mailman.qth.net>
Sent: 6/13/2020 12:17:44 AM
Subject: Re: [Elecraft] [KX3] Oppopsite Sideband Null question - Redux
Hi,
Elecraft have a handy little utility called RxSbNull.exe which does the whole
process. All you need is an up to date KX3, an up to date XG3, a Windows
computer and the utility. It works like a charm. Turn the radio volume down
before you start it though otherwise it’ll annoy the hell out of you.
Cheers
Mark Forsyth
http://jandmf.com
VK3KW
On 12 Jun 2020, at 11:36 pm, Grant Youngman <ghyoung...@gmail.com> wrote:
Elecraft Tech Support seems (understandably) a bit slow to respond at this
point. This is a repeat of a question I asked a few days ago. Maybe someone
else will see it and have some insight (?).
I have redone the opposite sideband null procedure in my KX3 (#8342) with
KXFL3 filter board, using both the 2013 per-band null procedure, and the 2015
KXFL3 installation/calibration instructions. The procedures are essentially
the same, with a minor difference in RIT setting, and the fact that the KXFL3
installation manual calls this out only on 20M rather than on each band
individually.
With my XG3 as a signal source, I get an excellent opposite sideband null
using either FL1 or FL2 bandwidth settings on all bands. With narrow bandwidth
and FL3 switched in, the null is very broad and shallow, and the opposite
sideband is reduced only on the order of 10dB (+/-) rather than the very deep
nulls (60+ dB) obtainable with FL1/FL2. As a result, the opposite sideband
remains clearly audible when tuning across a signal — say CW at 500 Hz
bandwidth, etc.
If anyone else out there has done either of these procedures, did you get as
deep a null with FL3 as with FL1/FL2? I’m trying to determine if this is
normal, or if there's an issue in the radio, possibly with my KXFL3 board.
Thanks … Grant NQ5T
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