User Manual

15
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 low-
ered 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.
Fig.2-13 STC
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.2-14 FTC
0.75
0.25
HU
STC OFF STC ON
0.75
0.25
HU
Echo is suppressed
around center
0.75
0.25
HU
FTC OFF FTC ON
0.75
0.25
HU
Small noises
are reduced.