7
STC (Sensitivity Time Control)
Since echo signals received by the radar are strong when they are coming from a short distance, it is difficult
to compare signal strength between each reflected signal. To overcome this difficulty, signal strength is adjusted
in such a way that the received signal levels coming from a short distance are lowered and those from a long
distance are raised. This function should prove useful when there are large reflected waves from sea surfaces
during rough weather.
FTC (Fast Time Constant)
When it rains or snows, fine noise may appear over the entire screen, making it difficult to identify echoes.
In such a case, echo images on the screen can be made easily distinguishable by adjusting FTC.
Fig.2-13 STC
Fig.2-14 FTC
