MAI NTENANCE MANUAL
ATC-1400A-2
2-2-2
Page 2 6
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
45. Set DME DEV P
2
/CAL S w i t c h to +
∆
and DME P
2
DEV T h u m b w h e els t o 1.0.
46. Ver i f y P
1
to P
2
pul s e spa c i n g i s 3 1.0 µs ( ±0 . 1 µs).
47. Set DME DEV P
2
/CAL S w i t c h to -
∆
. Ve r i f y P
1
to P
2
pul s e spa c i n g i s 2 9 µs
(±0.1 µs).
48. Set DME P
2
DEV T h u m b w h e els t o 7.9
µ
s. V e r i f y P
1
to P
2
pul s e spa c i ng i s
22.1 µs ( ±0 . 1 µs ).
49. Set DME DEV P
2
/CAL S w i t c h to +
∆
. Ve r i f y P
1
to P
2
pul s e spa c i n g i s 3 7.9 µs
(±0.1 µs).
50. 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 a nd DME P
2
DEV
Thumbwh e e l s t o 1 . 0
µ
s. V e r i f y P
1
to P
2
pul s e spa c i n g i s 1 3 µs ( ±0 . 1 µs ) .
51. Set DME DEV P
2
/CAL S w i t c h to -
∆
. Ve r i f y P
1
to P
2
pul s e spa c i n g i s 1 1 µs
(±0.1 µs).
52. Set DME P
2
DEV T h u m b w h e els t o 5.0
µ
s. V e r i f y P
1
to P
2
pul s e spa c i ng i s
7.0 µs (±0. 1 µs ) ) .
53. Set DME DEV P
2
/CAL S w i t c h to +
∆
and DME P
2
DEV T h u m b w h e els t o 7.9
µ
s.
Verif y P
1
to P
2
pul s e spa c i n g i s 1 9.9 µs ( ±0 . 1 µs).
54. Set C W / N O R M / O F F S w itch t o C W a nd R F L E V EL C o n t r o l to 0 d B m .
55. Conn e c t Fre q u e ncy C o u n t er t o R F I/O Con n e c tor. R e c ord C W f r equ e n c y ou t p u t .
56. Dis c o n n ect F r e que n c y Coun t e r fro m RF I / O C o nnec t o r .
57. Set C W / N O R M / O F F S w itch t o N O R M a n d R F LEV E L C ontro l t o -12 d B m .
58. Conn e c t Heter o d y ne Moni t o r to RF I / O Connec t o r .
59. Conn e c t Var i a b le F r e q uenc y G e n erat o r to Het e r o dyn e M o n i tor L O C o n n ecto r .
Adju s t V ari a b l e Fr e q u e ncy G e n e r ato r f o r a z e r o be a t o f DME p u l s e as s e e n on
Oscill o s c ope. ( R e fer t o 2 -2- 2 , F igur e 34 f o r ty p i c al d i s pla y o f fr e q u enc y z ero
beat w a v e f orm.)
7503004
DME Puls e Z e ro Be a t W a vef o r m
Figu r e 34
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