Aeroflex ATC-1400A-2 - Page 21

MAI NTENANCE MANUAL
ATC-1400A-2
2-2-2
Page 2 1
Subj e c t to E x p o rt Con t r o l, s e e C o ver P a g e fo r d e tail s . F e b 2/ 0 9
STEP PROCEDURE
21. Pus h t he l e f t or r i g h t ar r o w k e y u n t i l ‘Mar k e r 1” s e l ect i o n app e a r s.
22. Pu s h t he u p o r do wn a r row k e y t o ce n t e r Mark e r 1 in t h e middl e o f the f i rst
puls e .
23. Pus h t he l e f t or r i g h t arr o w k e y u n t i l ‘Mar k e r 2” s e l ect i o n app e a r s.
24. Pu s h t he u p o r do w n a rrow k e y to c e n t er Mar k e r 2 i n t he mid d l e of t h e sec o n d
puls e .
25. Pus h t he “ GRAP H ’ b u tto n o n ce t o g e t mark e r r eadi n g s at t o p of s c r e en.
26. Sub t r a ct t h e M a r ker 2 r e adin g f r om the Ma r k e r 1 r e a ding t o det e r m i n e th e l e vel
diff e r e nce b e t ween P
1
and P
2
. Ve r i f y le v e l of P
2
(SLS P u l se) i s e qual t o P
1
puls e . Adju s t R 2 671 ( S L S Cali b r a tion A d just ) ( 2 0 0 MHz Con t r o l PC B o a r d
Asse mb l y , 2-2- 2 F i gur e 2 6 ) a s n e ede d f o r pr o p e r re s u l t s.
27. Set S L S / E C HO ON/OFF Switc h t o ON.
28. Sub t r a ct t h e M a r ker 2 r e adin g f r om the Ma r k e r 1 r e a ding t o det e r m i n e th e l e vel
diff e r e nce b e t ween P
1
and P
2
. Ve r i f y le v e l of P
2
(SLS P u l se) i s e qual t o P
2
puls e . Adju s t R 2 671 ( S L S Cali b r a t ion A d j ust) ( 2 0 0 MHz Con t r o l PC Bo a r d
Asse mb l y , 2-2- 2 F igur e 2 6 ) a s n e ede d f o r pr o p e r re s u l ts.
NOTE: It m a y be n e c e ssa r y t o a l t e rnat e l y re p e a t St e p s 26 a n d 28, a s the
adju s t m e n ts a r e int e r a cti v e a nd a d j ust i n g one S L S le v e l may a f f e ct t h e
other S L S lev e l .
29. Se t S L S/ECHO T h u m b w h e els t o l eve l s s hown i n 2 -2- 2 , T abl e 4 9 and v e rify S L S
puls e l eve l s i n 2 - 2 - 2 , T a b l e 49 .
SLS/ECHO
THUMBWHEELS
SETTING
ACCEPTABLE SLS
PULSE LEVEL
(NONCOHERENT SLS)
ACCEPTABLE SLS
PULSE LEVEL
(SLS)
0 dB
refe r e n c e wit h P
1
(±0.5 d B ) ref e r e n ce wi t h P
1
(±0.2 d B )
-5 dB
-5 dB ( ±0 . 5 d B) -5 dB m (±0 . 2 d B )
-10 d B
-10 d B ( ±0 . 5 dB) - 10 d B m ( ±0 . 2 d B)
3 dB
+3 dB ( ±0 . 5 dB) + 3 d B m (±0.2 dB )
6 dB
+6 dB ( ±0 . 5 dB) + 6 d B m (±0.5 dB )
SLS P u l s e Le v e l Chart
Tabl e 4 9
30. Set SLS/E C H O O N / OFF Swit c h to OFF and R F L EVEL C o n t rol t o - 1 0 dB.
31. Disc o n n e ct P o w e r Meter S e n s o r fr o m A T C - 1 4 00A- 2 R F I /O.
32. Set POWE R S w i t ch t o O F F .
33. Dis c o n nec t t e st e q u ipment .