IFR COM-120C, Operation Manual

Page: 134 / 326

4-61
SECTION 4
OPERATION
300 kHz
S e l e c t s 3 0 0 k H z I F B a n d w i d t h F i l t e r .
15 kHz
S e l e c t s 1 5 k H z I F B a n d w i d t h F i l t e r .
30 kHz
S e l e c t s 3 0 k H z I F B a n d w i d t h F i l t e r .
OTe
n
F o r f o l l o w i n g g u i d e l i n e s ,
∆
F i s F r e q u e n c y D e v i a t i o n i n H z ,
Φ
i s P h a s e
D e v i a t i o n i n R a d i a n s , F m i s t h e T o n e M o d u l a t i o n F r e q u e n c y i n H z a n d
I F i s M i n i m u m I F F i l t e r B a n d w i d t h . G e n e r a l G u i d e l i n e s f o r I F F i l t e r
S e l e c t i o n a r e a s f o l l o w s :
F o r F M M o d u la t e d Si g n a l s :
I F = 4 (
∆
F + F m)
F o r P M M o d u l a t e d S i g n a l s :
I F = 4 F m (
Φ
+ 1 )
F o r A M M o d u l a t e d S i g n a l s :
I F = 1 5 k H z, f o r F m
≤
1 k H z
o
S e l e c t T o n e / D a t a T y p e f o r T O N E / D A T A C O D E F ie l d a s r e q u i r e d . Pr e s s F 2 t o
a ct i v a t e d e co d i n g .
o
S e l e c t d e s ir e d D I S T O R T I O N / S I N A D R e a d i n g .
Pr e s s F 2 t o s e le c t S I N A D R e a d in g .
Pr e s s F 3 t o s e le c t D I ST O R T I O N R e a d in g .
RF: 10.0000 MHz
FL: OFF
Input: ANT
Atten: 30 dB
Demod: FM IF BW: 15 kHz