QCX assembly Rev 1.08
136
7.10
Unwanted sideband rejection
The following chart shows the measured level of the Upper Sideband signal (USB) and the
unwanted Lower Sideband signal (LSB) when tuning the receiver through a strong test signal. The
curves depend very heavily on the I-Q balance and audio phase shift adjustments, and these
curves are from one measured prototype.
Subtraction of these two curves results in the unwanted sideband level as shown in the following
chart. Normally anything above 40dB rejection is considered good; above 50dB is excellent. With
the built-in adjustment features of this kit it is relatively easy to achieve really excellent unwanted
sideband rejection.
Summary of Contents for QCX 5W CW
Page 9: ...QCX assembly Rev 1 08 9...
Page 10: ...QCX assembly Rev 1 08 10...
Page 12: ...QCX assembly Rev 1 08 12...
Page 50: ...QCX assembly Rev 1 08 50...
Page 105: ...QCX assembly Rev 1 08 105...
