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decreasing the input signal, lowering IF gain and changing central
frequency(CENT) would probably help.
The pic below shows a relative severe situation of second image
interference, where the image suppression is approximately 58dB. By shifting
central frequency, the interference could be lowered to -65dBc. Since the
second image is very close to tested signal, user needs to keep in mind not to
confuse it with the spurious divergence. To distinguish them, user can simply
shift the central frequency and observe whether it moves with the main wave
at the same time.
6.5 What about other interference besides image
interference?
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