Some KX3 owners hear a pulsing or clicking noise when tuning the VFO on higher
bands, especially when atmospheric noise is low. We discovered that the KXFL3
filter module is responsible for nearly all this noise, and that it can be
reduced or eliminated with a simple modification to the module.
TJ Campie wrote:
How come this works? What was the function of those pins that caused the
problem?
The three pins removed in the KXFL3 modification provide control signals for
accessing a small EEPROM on the module. This memory device was intended to
store DSP gain/phase parameters for
The instructions suggest that realignment of the filter may be necessary if
some of the capacitors are pressed on the board. Is there any simple way to
tell if such realignment is necessary? Is it very likely that if those parts
are not touched realignment is not needed?
73 - Mike WA8BXN
Mike WA8BXN hubb...@hotmail.com wrote:
The instructions suggest that realignment of the filter may be necessary if
some of the capacitors are pressed on the board. Is there any simple way to
tell if such realignment is necessary?
As long as you handle the module carefully and don't press
Mike,
What you would be checking for is opposite sideband suppression and
you'll need a very strong single tone signal source. S9 + 20 or
thereabouts is a good level, and this can be on or around 20m. There's a
procedure to do the calibration in the KXFL3 installation instructions,
but the
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