9
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 over-
come 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 diffi-
cult to identify echoes. In such a case, echo images on the screen can be made easily distin-
guishable by adjusting FTC.
0.75
0.25
HU
STC OFF
STC ON
0.75
0.25
HU
Echo is suppressed
around center
Fig.2-13 STC
0.75
0.25
HU
FTC OFF
FTC ON
0.75
0.25
HU
Small noises
are reduced.
Fig.2-14 FTC
Содержание RA40C
Страница 24: ...14 Horizontal line Line of sight θ Fig 3 2 Obtaining sufficient dip angle ...
Страница 48: ...38 The function can be changed at the KEY ASSIGNMENT function in the CUSTOM menu of the SETUP ...
Страница 69: ...73 ...
Страница 80: ...63 a PPI Screen All functions can be used on this screen D V T D Q T g t PPIScr een ...
Страница 93: ...52 ...