CR40
42
/50 MKII Radar operation
Chapter 7
96
Tune
– see Glossary.
To return to AUTO after manual adjustment, press [CLR].
Gain
– see Glossary. Gain can also be adjusted directly from keypad.
+/- keys will adjust radar gain. Optimum adjustment: Press [+] till
noise appears, then press [-] till noise just disappears again.
Press [CLR] to toggle between manual and auto operation.
Sea
– see Gl section 7.1.8 and 7.2.2.
Press [CLR] to toggle between manual and auto operation.
Rain
– see also Glossary and section 7.2.2.
- adjusting for Rain clutter: Rain clutter or FTC (Fast Time Constant)
removes the leading edge of the returning signal. Rain or snow returns
cause many small echoes, continually changing in size and position to
appear as a hazy area on the display. Rain and snow targets do not have
much depth. By removing the leading edge, the unwanted echoes will
disappear leaving real targets visible. The amount of delay is controlled
by the rain clutter adjustment. As you increase the adjustment, the
delay will get larger causing the returning signals to decrease, or
disappear. Do not adjust the rain clutter too high, as this will eliminate
all small targets.
)
To properly adjust for rain clutter:
1. Set rain clutter to the OFF position.
2. Set gain.
3. Slowly increase rain clutter until the hazy area caused by the rain
or snow become less dense. Increasing it too much will not only
remove the rain clutter, but also any targets inside the rain area.
Note! Since Rain and Snow are continually changing in size and
density, tweaking of the rain clutter adjustment is necessary to
maintain the best results.
RR
= RangeRings – toggle between # *.** (as display example), *.**
(no RR figures), OFF (no RR)
Heading line
can disappear for approx. 5 seconds (move cursor to
highlight “Heading line”, then press +/-).
IR
(Interference Rejection)
– toggle between ON and OFF, see sec.7.1.9.
