6 - 7 8
SECTION 6
OPTIONS
R X A U D I O S E N S I T I V I T Y
T h i s r e s u l t i s t h e A F L e v e l r e a d b a c k f r o m t h e R a d i o ’ s a u d i o o u t p u t p a t h w i t h a
1 k H z s i n e w a v e F M - g e n e r a t e d a t 3 k H z ( 1 . 5 k H z f o r n a r r o w b a n d ) d e v i a t i o n ,
- 5 0 . 0 d B m l e v e l , f r o m t h e C O M - 1 2 0
C
t o t h e R a d i o ’ s a n t e n n a i n p u t ( R a d i o m u s t h a v e
r e c e i v e r u n s q u e l c h e d ) . T h e A F L e v e l v o l t a g e i s t h e n m e a s u r e d u s i n g w i d e b a n d ( n o )
f i l t e r i n g f r o m t h e A u d i o / D a t a / S I N A D I n p u t b a s e b a n d j a c k . T h e r a d i o m u s t b e s e t a t
f u l l v o l u m e t o m a k e t h i s m e a s u r e m e n t . T h e r e s u l t i s t h e A F L e v e l v o l t a g e s h o w n i n
V r m s a n d m V p e a k t o p e a k .
R X SI N AD @ 1 2 d B
T h i s r e s u l t i s t h e S I N A D r e a d i n g f r o m t h e R a d i o ’ s a u d i o o u t p u t p a t h w i t h a 1 k H z
s i n e w a v e F M - g e n e r a t e d a t 3 k H z ( 1 . 5 k H z f o r n a r r o w b a n d ) d e v i a t i o n f r o m t h e
C O M - 1 2 0
C
t o t h e R a d i o ’ s a n t e n n a i n p u t ( R a d i o m u s t h a v e r e c e i v e r u n s q u e l c h e d ) .
T h e C O M - 1 2 0
C
G e n e r a t o r R F L e v e l s t a r t s a t - 1 0 5 . 0 d B m a n d l o w e r e d u n t i l a S I N A D
r e a d i n g o f 1 2 d B i s a c q u i r e d . T h e n t h e R F L e v e l i s r e c o r d e d a s t h e r e s u l t o f t h e
t e st i n d B m .
I f t h e R a d i o s q u e l c h e s b e c a u s e o f s u b - a u d i b l e d r o p o u t b e f o r e t h e 1 2 d B S I N A D i s
r e a c h e d , t h e l a s t g o o d r e a d i n g t a k e n b e f o r e t h e R a d i o s q u e l c h e d i s r e c o r d e d a n d
s h o w n a l o n g w i t h t h e R F L e v e l a t t h a t r e a d i n g .
Results: Audio T e st ( R adio T x Audio Response)
T X A U D I O R E S P O N SE
T h i s s h o w s t h e r e s u l t s o f t h e
m e a s u r e d d e v i a t i o n f r o m t h e
R a d i o ’ s t r a n s m i t t e r w i t h a
s e r ie s o f t o n e f r e q u e n c i e s ( si n e
w a v e ) i n j e c t e d i n t o t h e R a d i o ’ s
a u d i o i n p u t p a t h f r o m t h e C O M -
1 2 0
C
D a t a G e n o u t p u t
b a s e b a n d j a c k a t 2 0 % o f t h e R a d i o ’ s
R a t e d O u t p u t
. M e a s u r e m e n t s
d o n o t i n c l u d e t h e R a d i o ’ s s u b - a u d i b l e d a t a d e v i a t i o n .
T h e s e r ie s o f t o n e f r e q u e n c i e s u s e d a r e : 3 0 0 H z , 8 0 0 H z , 1 3 0 0 H z , 1 8 0 0 H z ,
2 3 0 0 H z , 2 8 0 0 H z a n d 3 0 0 0 H z .
T h e f o l l o w i n g t e x t d e s c r i b e s t h e t e s t r e s u l t s a n d t h e i r s i g n i f i c a n c e i n o r d e r o f
a p p e a r a n c e o n t h e s c r e e n .
I f o n l y R e g i s t r a t i o n w a s E N A B L E D , o n l y t h e f i r st t h r e e r o w s o f r e s u l t s a r e s h o w n .
0061600
Tx Audio Response
Freq:
[Radio]
.3 K
.8 K
1.3 K
1.8 K
2.3 K
2.8 K
3.0 K
1.05
0.25
0.88
0.62
1.16
1.18
1.07 kHz
Dev:
Содержание COM-120C
Страница 1: ...comMQRPc c š ƒ o ƒ mƒ šƒ QPPRMPVPQMRpP advancing wireless test s m ...
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