IFR ATC-601-2, Operation Manual

Page: 62 / 131

O P E R A T I O N M A N U A L
A T C - 6 0 1
1 - 2 - 4
P a g e 2 3
J u n 1 / 9 7
T E S T D E S C R I P T I O N
1 8 . D i v e r si t y
R e f e r t o 1 - 2 - 4 , F ig u r e 2 8 .
T he D iver sit y t e st ver if ies U U T
d i v e r si t y i s o l a t i o n ( d i f f e r e n c e b e t w e e n
" O n " a n t e n n a s q u i t t e r s a n d " O f f "
a n t e n n a s q u i t t e r s) i s
≥
2 0 d B .
A T C - 6 0 1 d i s p l a y s d i v e r si t y i s o l a t i o n i n
d B . T e s t o n l y r u n s i f s e t i n S e t u p # 3
M e n u .
N O T E: T o in su r e
≥
2 0 d B d y n a m i c
r a n g e , t e s t m u s t b e r u n w i t h i n
5 0 f e e t ( 1 5 . 2 4 m e t e r s) o f U U T
A n t e n n a b e i n g t e s t e d .
1 9 . M T L D i f f e r e n c e
R e f e r t o 1 - 2 - 4 , F ig u r e 2 9 .
V e r if i e s R e c e i v e r S e n s i t i v i t y o r M T L t o
M o d e A i n t e r r o g a t i o n s d o e s n o t d i f f e r
m o r e t h a n 1 d B f r o m M T L t o M o d e C
i n t e r r o g a t i o n s . T h e M T L d i f f e r e n c e ,
b a s e d o n t h e a v e r a g e o f 1 0 0 M o d e A
a n d 1 0 0 M o d e C i n t e r r o g a t i o n s , i s
d i s p l a y e d .
** DIVERSITY TEST - PASSED **
DIVERSITY ISOLATION: 27 dB
Press RUN to start
** DIVERSITY TEST - FAILED **
DIVERSITY ISOLATION: +++++
SATURATED
Press RUN to start
** DIVERSITY TEST - FAILED **
DIVERSITY ISOLATION: 18 dB
Press RUN to start
** DIVERSITY TEST - FAILED **
DIVERSITY ISOLATION: +++++
Press RUN to start
S a m p l e D i v e r si t y T e s t S c r e e n s
F ig u r e 2 8
** MTL DIFFERENCE TEST - PASSED **
MODE A MTL - MODE C MTL = Ø.2 dB
Press RUN to start
** MTL DIFFERENCE TEST - FAILED **
MODE A MTL - MODE C MTL = 1.1 dB
Press RUN to start
S a m p l e M T L D i f f e r e n c e T e s t S c r e e n s
F ig u r e 2 9