Simrad RA771UA, Инструкция по эксплуатации

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O p e r a t e Keys and
C o n t r o l s Depending
on C i r c u m s t a n c e s
Refer
t o
p a r a g r a p h 3.2 and
a f t e r .
T o suspend
radar o p e r a t i o n Press t h e
OPERATE
key
once.
The
r a d a r
w i l l
s t o p t r a n s m i s s i o n and
t h e r a d a r p i c t u r e w i l l d i s a p p e a r .
To
resume
r a d a r o p e r a t i o n ,
press
t h e OPERATE key
once
more.
T o
S t o p
Radar
O p e r a t i o n
Press t h e POWER SWITCH more t h a n
seconds.
2 . 3 Sea Clutter Suppression
2 . 3 . 1 Manual Sea C l u t t e r S u p p r e s s i o n
STC:
S e n s i t i v i t y
T i m e C o n t r o l )
P r e s s t h e STC key. The u n d e r l i n e d n u m e r i c a l
i n d i c a t i o n shown below w i l l be d i s p l a y e d and t h e s e a
c l u t t e r s u p p r e s s i o n mode
w i l l
be s e t .
0 G 3 0
I n d i c a t e s STC a d j u s t m e n t mode
i s
selected.
Turn t h e c o n t r o l knob t o a d j u s t t h e l e v e l . The STC
a d j u s t a b l e r a n g e
i s
from 0 t o
even when t h e s e a i s calm. When t h e s e a
i s
rough, i n t e n s e
echoes a p p e a r o v e r a wide a r e a and sometimes make t a r g e t s
i n v i s i b l e .
The STC c o n t r o l d e c r e a s e s s u c h
sea c l u t t e r
and makes
t a r g e t s e a s i l y v i s i b l e .
T u r n
t h e c o n t r o l knob clockwise t o
d e c r e a s e s e a c l u t t e r . If t h e c o n t r o l knob is t u r n e d t o o
f a r ,
echo s i g n a l from i m p o r t a n t t a r g e t s may d i s a p p e a r .
A d j u s t t h e c o n t r o l v e r y c a u t i o u s l y by o b s e r v i n g t h e
p i c t u r e w i t h utmost c a r e .
U s u a l l y t h e STC c o n t r o l s h o u l d be s e t
so
t h a t t h e r e
i s no s e a c l u t t e r a t or n e a r t h e d i s p l a y c e n t e r when t h e
s e a
i s
calm, w i t h t h e d i s t a n c e r a n g e p r e s e t t o
a
minimum
or 0.125
NM.
s h o r t - d i s t a n c e s e n s i t i v i t y ( g a i n ) lower and t h e long-
d i s t a n c e s e n s i t i v i t y ( g a i n ) h i g h e r .
For
t h i s r e a s o n , no
p i c t u r e may emerge on t h e d i s p l a y i f t h e s e a i s calm and
t h e r e
are no l a r g e t a r g e t s n e a r
your s h i p when t h e range
i s s e t t o
0.125
t o and
t h e
l e v e l i s more than
3 0 .
2 . 3 . 2 Automatic Sea C l u t t e r S u p p r e s s i o n
Automatic Sea C l u t t e r S u p p r e s s i o n and Automatic Gain
Sea c l u t t e r i s o b s e r v e d from s h o r t - r a n g e s e a s u r f a c e s
The STC
c i r c u i t
is
d e s i g n e d p r i m a r i l y t o make t h e
C o n t r o l