Aeroflex ATC-1400A-2 - Page 34

MAI NTENANCE MANUAL
ATC-1400A-2
2-2-2
Page 3 4
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
2. Conne c t t est e q u ipment t o ATC-14 0 0 A -2 a s s h own i n 2 - 2-2 , F i gure 3 6 .
3. S e t POWER S w i t c h to ON a n d all o w 1 0 minut e w a r m-up pe r i o d.
4. Press C L E A R RNG Push b u t t on S wi t c h .
5. Veri f y 8.0 9 1 2 6 9 MHz (±4 0 0 H z ) i s d i spl a y e d on F r equ e n c y Cou n t e r. A d j u st
C520 ( D e l a y Osc A d j u st) ( 2 - 2 -2, F i g ure 2 5 ) as n e e d ed f o r p rope r r eadi n g .
6. Usin g D u a l P u l s e Gene r a t or, i n ject t w o neg a t i ve g o i ng T T L puls e s , sp a c e d 36 µs
apart , i n to p i n 5 of A UX I L I A RY Conn e c t o r (J6 ) .
7. A djus t R F LEVE L C o ntro l f o r app r o x i mately 1 W i nput a t E XTER N A L RF
Conne c t o r (J 2 2 ) or a p p r oxi ma t e l y 1 0 0 W di s p l aye d .
8. Usin g O s c ill o s c ope , v e rif y a pul s e pai r c orre s p o ndi n g to s i g nal f r o m dual p u lse
gene r a t or i s d ispl a y e d on F r ont P a n el G E N C o n n e cto r . Ver i f y corr e s p ond i n g
rang e r e ply . V erif y s paci n g from P
1
of i n t e rrog a t i o n to P
1
of Ra n g e Rep l y is
56 µs (±24 7 n s ). A d j u st R2 6 2 1 (Y Ch a n n e l Del a y A dju s t ) (2-2 - 2 , Fig u r e 26) a s
need e d f or p r o p er s p a c ing .
9. S e t FREQ/FU N C T I O N S ELECT T h u m b w h e e l s to 1 0 90 MHz X , D M E D E V P
2
/CAL
Switc h t o +
∆ and DME P
2
DEV T h u m b w h e els t o 5.0.
10. Usi n g Dual P u l se Ge n e r ato r , i nje c t two n e g a tive g o ing T T L pu l s e s, s p a c ed 1 2 µs
apart , i n to p i n 5 of A UX I L I A RY Conn e c t o r (J6 ) .
11. Usi n g Oscil l o s cop e , ver i f y pul s e pai r c o rre s p o ndi n g to s i g n al f r o m dual p u lse
gene r a t or i s d isp l a y ed o n G E N C o n nec t o r . V e r ify c o r resp o n d ing r a n ge r e p l y.
Veri f y spac i n g fro m P
1
of i n t e rrog a t i o n to P
1
of Ra n g e Rep l y is 5 0 µs (±247 n s ).
Adju s t R 2 619 ( X C h a nne l D e l ay A d j u s t) ( 2 - 2 - 2, F i g u re 2 6 ) a s ne e d e d for p r o per
spa c i n g.
12. Set R A N GE / V E L ACCEL T h u m b w h e els t o 0 0100 a n d pr e s s LOAD RNG
Pushbu t t o n Swit c h . Set - 1 N M i / N O R M S w i tch t o -1. V e rif y s p aci n g b etwe e n P
1
of i n t e r rog a t i on p u l s e to P
1
of r e p ly p u l s e i s 5 0 µs (±24 7 n s ).
13. 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 a nd DME DEV
P
2
/CAL S w i t c h to CAL .
14. Se t D u a l Pu l s e Gener a t o r ou t p u t pu l s e spac i n g for 3 6 .0 µs. V e rif y s p aci n g
betwe e n inte r r o gat i o n pul s e P
1
to r e p ly p u l s e P
2
is 5 6 µs (±24 7 n s ).
15. Set R A N GE / V E L/ACCEL T h u m b w h e els t o 3 9900 a n d -1 N Mi / N ORM Swi t c h to
NORM.
16. Ve r i f y sp a c i ng b e t w e en i n t e rro g a t i on p u l s e P
1
to r e p ly p u l s e P
1
is 4 9 8 7.2 µs
(±0.49 µs).
17. 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 .
18. Se t D u a l Pu l s e Gener a t o r ou t p u t pu l s e spac i n g for 1 2 .0 µs. V e rif y s p aci n g
betwe e n inte r r o gat i o n pul s e P
1
to r e p ly p u l s e P
1
is 4 9 8 1.2 µs ( ±0 . 4 9 µs ).
19. Remove T T L Outp u t o f Dua l P u lse Ge n e r ator f r om rear p a nel a n d con n e c t 50 Ω
outp u t to T P 3 5 01 ( 2 - 2 -2, F i g ure 2 6 ) with n e g ati v e g oin g v i deo p u l ses .
20. Set SLS/E C H O O N / OFF Swit c h to ON. Clea r R a n ge.