Aeroflex ATC-1400A-2 - Page 29

MAI NTENANCE MANUAL
ATC-1400A-2
2-2-2
Page 2 9
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
6. Set Du a l P ulse G e n e r ator C A L / V erni e r S witch t o Vern i e r and o u t p ut p u l s e
spac i n g to 1 1 .30 µs. D e c rea s e o r i n c r eas e o utp u t p uls e s pac i n g un t i l a f l a s hin g
"F" i s dis p l a y ed on D ME - P R F H z/XP D R - % R E PLY Di s p l ay.
7. Ver i f y spa c i n g b e t w e e n t w o p u lse s i s 11 . 2 5 µs (±0. 1 µs).
8. Set Du a l Puls e G e n e rat o r C A L /Ver n i e r Swi t c h to CAL a n d out p u t pul s e s pac i n g
for 1 2 . 7 µs .
9. S et Du a l P ulse Ge n e r a tor C A L / V e rnie r S w i t ch t o V e rnie r . In c r e ase o r d ecr e a s e
out p u t pul s e spa c i n g u n t i l a f l a shi n g "F" i s di s p l a yed o n D M E - P RF Hz X P D R - %
REPLY D i s p lay.
10. Ve r i f y s p a c ing b e t ween t w o pul s e s is 1 2 . 75 µs ( ±0 . 1 µs ).
11. If p r o per r e s ults c a n not b e obta i n e d in S t e ps 5 t h roug h 1 0 , pe r f o rm Ste p s 1 2
thro u g h 14. W h en r e s u lts a r e ob t a i n ed g o t o St e p 15.
12. Ad j u s t Dual P u lse Ge n e r ato r o u tpu t p u lse s p a cin g f o r 11 . 2 5 µs.
13. Ad j u s t R412 ( 1 2 µs Decod e r A djus t ) (2-2 - 2 , Fig u r e 25) t o thre s h o ld whe r e "F"
just d i s appe a r s in l e f t -most d i g i t of D ME - P R F Hz/XP D R - % R E P L Y Dis p l a y .
14. Repe a t proc e d u res i n S tep s 5 thr o u g h 10.
15. 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 .
16. Se t D u a l Pu l s e Genera t o r CAL/V e r n i er S w i t c h to C A L a nd o u t p u t p u l s e spa c i n g
for 3 6 . 0 µs .
17. Ver i f y a " F " i s no t d i spl a y e d in D ME- P R F H z /XP DR-% R E P L Y Dis p l a y .
18. Set D u a l Pul s e G e n erat o r C A L /Ver n i e r Swit c h t o Ve r n i e r an d o u tput p u l se
spa c i n g to 3 5 .3 µs. D e c r eas e o r in c r e ase o u tpu t p u lse s p aci n g unt i l a fl a s h ing
"F" i s dis p l a y ed on D ME - P R F H z/XP D R - % R E PLY Di s p l ay.
19. Ve r i f y s p a c ing b e t ween t w o pul s e s is 3 5 . 25 µs ( ±0 . 1 µs ).
20. Se t D u a l Pu l s e Genera t o r CAL/V e r n i er S w i t c h to C A L a nd o u t p u t p u l s e spa c i n g
for 3 6 . 7 µs .
21. Set D u a l Puls e G e n e r ator C A L / V erni e r S w itc h t o Ve r n i e r. I n c reas e o r de c r e a se
out p u t pul s e spa c i n g u n t i l a f l a shi n g "F " i s dis p l a yed o n D M E P RF Hz/ X P D R -
%REPLY D i s p lay .
22. Ve r i f y s p a c ing b e t ween t w o pul s e s is 3 6 . 75 µs ( ±0 . 1 µs ).
23. If p r o per r e s ults c a n not b e obta i n e d in S t e ps 1 6 t hrou g h 2 2, p e r f orm St e p s 24
thro u g h 26, o t h erwis e g o to S t e p 27 .
24. 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 5 .25 µs .
25. Set R 4 1 9 (36 µs Dec o d e r Ad j u s t) ( 2 - 2 - 2, F i g u re 2 5 ) t o t h r e s hol d w h e r e " F " j ust
disa p p e a rs i n l e ft-mos t d i git o f D M E - P RF Hz/ X P D R - % R E PLY Di s p l ay.
26. Re p e a t pr o c e d ure s i n Ste p s 16 t h r o u gh 2 2 .