The combination of the cabinet and speaker of my
K2 (#5665) has a VERY pronounced resonance at
about 450 Hz. How fortunate, as this is the frequency
at which I like to copy CW. (:-)
The resonance is so pronounced that it would present
a problem if I wanted to use a higher frequency, say
600 Hz. It initially caused me a bit of consternation as
I was setting up the filters ... until I realized what was
going on. Even with the filter set up for 600 Hz I would
still find myself tuned and listening lower than the "Spot"
tone ... sort of a human AFC circuit. (:-)
Has anyone else noted this? I wonder if all the speakers
supplied with K2's are of the same design from the same
supplier?
Mine -does- have all options installed except the battery
and I assume the resonant frequency of the box would be
different ... or non-existant ... with different "fillers" inside
the case.
I have two of the "old" Skytech variable-resonance speakers
stored away that are fine examples of the application of
housing / speaker resonance as a CW aid. They use a sliding
tube to "tune" the assembly.
73! Ken Kopp - K0PP
[EMAIL PROTECTED]
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