MAI NTENANCE MANUAL
ATC-1400A-2
2-2-2
Page 2 5
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
35. Set A T C - 1 400 A - 2 cont r o l s as f o l l ows:
CONTROL SETTING
DME DEV P
2
/CAL Swi t c h CAL
TO /TAC/TD Sw i t c h TD
PRF SQTR ON/OFF S w i t c h OFF
IDENT TONE/ OFF / C O D E S w i t ch OFF
TACAN ON/OFF S w i t c h OFF
DBL INTE R R/ I N T R F Pul s e T humbwhe e l s 000.0 OFF
FREQ/FUNCTI ON S E L E C T Thumbwhee l s 109 0 M H z Y
SELF-IN T E R R / O F F Switch ON
36. Se t O s c i llo s c o pe S w e e p del a y coun t e r to 0 . 5 µs/Di v a n d Main S w e e p t o 1 0 µs.
37. Adj u s t Ver t i c al V e r n ier Co n t r ol t o p o sit i o n peak o f P
1
pul s e f or 0 t o 100 % o n
Oscil l o sco p e di s p l ay.
38. Ver i f y P
1
pul s e r ise t i m e , fro m 1 0 % to 9 0 % p oin t , i s 2. 0 µs (±0.2 5 µs).
39. Ver i f y P
1
pul s e f all t i m e , fro m 1 0 % to 9 0 % p oin t , i s 2. 5 µs (±0.2 5 µs).
40. Us i n g Osci l l o sco p e sta r t and s t op c o n t ro l s , cro s s lea d i n g a n d t rai l i n g e d g e s of
P
1
pul s e a t 50 % p o int ( 2 - 2-2 , F i gure 3 3 ). V e r i fy p u l s e wid t h a t 50 % p oint i s
3.5 µs (±0. 5 µs) . A dju s t R 2 623 ( P u l se W i d t h Ad j u s t) o n 2 0 0 MHz Con t r o l PC
Boar d A s sembly ( 2 - 2-2, F i g ure 2 6 ) as n e e ded f o r pro p e r res u l t s of S t e ps 3 5 , 3 6
and 3 7 .
NOTE: If R 2 6 23 i s a d just e d , rep e a t Ste p s 3 5 th r o u gh 3 7 . If S t e p s 35 , 3 6 , an d
37 c a n n ot a l l be s a t i sfi e d , ref e r to a s s e mbly t e s t ing .
7503003
DME P
1
Pul s e w i th L e a ding a n d Tr a i l ing E d ges C r o s s ed a t 5 0% P o i n ts
Figu r e 33
41. Set FR E Q/ F U N C T I ON SELEC T T h u m b w h eels t o 1 09 0 M H z X . Ver i f y on
Oscil l o sco p e P
1
to P
2
pul s e spa c i n g i s 1 2 µs ( ±0 . 1 µs ) .
42. Set FR E Q/ F U N C T I ON SELEC T T h u m b w h eels t o 1 09 0 M H z Y . Ver i f y on
Oscil l o sco p e P
1
to P
2
pul s e spa c i n g i s 3 0 µs ( ±0 . 1 µs ) .
43. Set DME DEV P
2
/CAL S w i t c h to +
∆
. Wh i l e inc r e m e n t ing D ME P
2
DEV
Thumbwh e e l s fr o m 0 t o 7. 9
µ
s, v e r i fy P
2
pul s e trac k s in 0 . 1 µs ste p s .
44. Set DME DEV P
2
/CAL S w i t c h to -
∆
. Wh i l e dec r e m e n t ing D ME P
2
DEV
Thumbwh e e l s fr o m 7 . 9 to 0
µ
s, v e r i fy P
2
pul s e trac k s in 0 . 1 µs st e p s .
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