In a domestic satellite TV installation , there is some distortion on the TV screen.
Using the tuner that is incorporated in the field strength meter, it is possible to verify the reception of the satellite channel.
Why is there this picture distortion?
The receiver incorporates an active stage in the terrestrial antenna input.
If the signal level of the terrestrial channel is too high, the saturation at this stage causes this problem.
You can check this by verifying the picture quality when you unplug the terrestrial antenna cable.
The solution is in the attenuation of these signals.