This is most likely power supply ripple from the variable loading of the
DSP, which occurs at a 12 kHz rate.
You may be able to reduce it by setting MENU:RX ISO to ON. This
increases average current in part by preventing the DSP from "sleeping"
between tasks, thus smoothing out some of the power supply load.
It is always best to use headphones or external speakers that have
limited response above 5 kHz with the KX3. The radio will not pass
audio information above this frequency, so the only thing wide response
headphones or speakers will provide is additional noise. This is
particularly true if your ears haven't "aged" to provide some low-pass
function for you :-)
73,
Lyle KK7P
While doing some tests tonight to compare the white noise of my Icom
IC-7000 to the white noise of the KX3, both having the AF gain turned all
the way down, I noticed...
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