Posted by
Michael Babineau on
Jun 29, 2004; 3:42pm
URL: http://elecraft.85.s1.nabble.com/FW-Re-IC-7800-vs-K2-tp368202p368204.html
Eric Ward" <
[hidden email]> wrote
>Using the narrowest filter setting to battle qrm in FD confirms that I
have
>the best copy on signals when they give me a recovered audio tone of
about
>470 hz - and - when I tune them in for that peak, I am (of course) off
their
>frequency since the KX1 seems to have a "fixed" offset of about 600
+/- hz.
Eric :
I can't comment as to whether the offset is fixed as I am using a side
tone pitch
of 600HZ. However, I have verified that the center
of the audio filter shifts to somewhere around 500hz when cranked down
to its lowest setting (I piped the KX1 audio into my computer running
Spectogram). I see the same sort of behavior on my Ten-Tec Scout,
which has a similar type of filter (Jones) so I am not sure if this is a
artifact of the design / implementation of this sort of filter.
The trick I use to tune signals is to peak the signal with the filter
at about the 500hz setting ... this gives me a filter center of around
600hz. If I need to crank the filter down to 300hz I then engage the RIT
if it is a particularly weak signal. I also notice some signal
attenuation
as the filter is tightened but I believe that this is normal.
Michael VE3WMB
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