Anritsu RA77OUA, Instruction Manual

Page: 11 / 52

2 . 4 Rain and
S u p p r e s s i o n
Press t h e FTC key. The 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 r a i n and s n o w c l u t t e r s u p p r e s s i o n m o d e
w i l l be
s e t .
I n d i c a t e s t h e mode
i s
s e l e c t e d .
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 range from
0
t o
C l u t t e r from r a i n , snow
or
fog may a p p e a r on a r a d a r
I n
such
a case,
t u r n t h e c o n t r o l knob a t t h e FTC mode
p i c t u r e and sometimes m a s k t a r g e t s c o m p l e t e l y i n v i s i b l e .
c l o c k w i s e . Then t h e c o n t o u r s
of c o n c e a l e d t a r g e t s
w i l l
a p p e a r . S i n c e t h e r a d a r u s e s
a
LOG
a m p l i f i e r , t h e FTC
f u n c t i o n
i s
v e r y e f f e c t i v e . But it t e n d s t o weaken t h e
i n t e n s i t i e s of e c h o e s from s h o r t - r a n g e t a r g e t s . Adjust
STC
and g a i n f o r t h e b e s t p i c t u r e .
c o u n t e r c l o c k w i s e t o l e v e l 0 when t h e r e i s no r a i n or snow.
I n t h i s s t a t e t h e FTC f u n c t i o n i s i n e f f e c t i v e .
Always t u r n t h e c o n t r o l knob a t t h e
FTC
mode f u l l y
2 . 5 M e a s u r i n g
T a r g e t
B e a r i n g s
Press
t h e
EBL
key t o s e l e c t t h e e l e c t r o n i c c u r s o r and
t h e i n d i c a t i o n
w i l l be d i s p l a y e d on t h e bottom of
t h e s c r e e n . Turn t h e c o n t r o l knob t o move t h e EBL t o
c o i n c i d e w i t h t h e t a r g e t t o measure t h e b e a r i n g from your
s h i p ' s heading.
P r e s s t h e
EBL
key once a g a i n t o e r a s e
t h e
EBL.
(To e r a s e t h e
EBL,
t h e
EBL
f u n c t i o n must be s e l e c t e d
a t t h e moment.
EBL 0.0'
2 . 6 M e a s u r i n g T a r g e t R a n g e s
2 . 6 . 1 Rough Range E s t i m a t i o n (Range Rings)
P r e s s t h e r a n g e r i n g key. F i x e d range marker r i n g s
w i l l
be d i s p l a y e d
as
shown below. The i n t e r v a l of range
marker r i n g s depends on t h e range a s t a b u l a t e d below:
1.5
0 . 2 5