QCX assembly Rev 1.08
135
The following chart shows the Quadrature Sampling Detector roll-off over the narrower range 0 to
5kHz. You can see that at the CW operating frequency 700Hz, the attenuation is insignificant; the
roll-off of the QSD does not significantly improve the selectivity of the CW filter, but it does improve
the intermodulation characteristics of the receiver.
7.9
CW Filter response
This chart shows the measured response of the CW filter (combined with the other filtering in the
receiver chain). It was measured by tuning the receiver across a test signal. Note that the centre
frequency, a little over 700Hz, could be altered by changing some component values.
Summary of Contents for QCX 5W CW
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