Aeroflex ATC-1400A-2 - Page 17

MAI NTENANCE MANUAL
ATC-1400A-2
2-2-2
Page 1 7
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
10. Se t O s c ill o s c ope c o n tro l s as f o l lows :
CONTROL SETTING
Vert i c a l S e n s iti v i t y 0.05 V / D i v
Coupl i n g Switc h DC
Trigg e r S ource C o n t r ol EXT S Y N C
Sweep 2 ms / D i v
11. Set C W / N O R M / O F F S w itch t o N O R M.
12. Adj u s t R 3 224 ( T A C A N AM NULL Cont r o l ) (AL C/ Mi x e r Assembl y ) ( 2-2- 2 ,
Figu r e 2 6) f o r minimum rip p l e of w a v e form (t o p puls e s ) dis p l a yed o n
Oscill o s c ope ( 2 - 2-2 , F i gur e 2 9 ).
7503001
Displ a y e d Wa v e f orm wit h M i n imum Ripp l e
Figu r e 29
13. Set C W / N O R M / O F F S w itch t o C W .
14. Set M o d u l ati o n M e t er Co n t r o ls a s f ollo w s :
CONTROL SETTING
Tuni n g Auto
High P a s s Fi l t e r (Hz) 10
Low Pa s s Filt e r (kHz ) 3
Peak Pk-P k / 2
Range 100
Func t i o n % AM
15. Pre s s spri n g load e d S 260 1 ( T ACAN T e s t Switc h ) ( 200 MHz G e n e r ato r A s sembly )
(2-2 - 2 , Figu r e 2 6) t o l e ft- mos t p osit i o n (15 H z ) . Ve r i f y Modul a t i o n Meter
dis p l a ys 2 1 % (±1 % ) .
16. Pre s s spri n g l oade d S 2601 ( T A CAN Te s t Switc h ) ( 200 MHz Ge n e r ator A s s embly)
(2-2 - 2 , Figu r e 2 6) t o r i ght- mo s t p osit i o n (1 3 5 H z ). V e r ify Mod u l a t ion Me t e r
dis p l a ys 2 1 % (±1 % ) .
17. Wi t h S W26 0 1 i n ce n t e r po s i t ion ( b oth 1 5 a nd 1 3 5 H z ), v e r i fy Modu l a t ion Me t e r
dis p l a ys 4 2 % (±2 % ) .
NOTE: Compo s i t e mod u l a tio n m a y cau s e err o n e ous r e adi n g s du e t o ph a s e -lo c k
circ u i t ry i n m o d ula t i o n mete r .
18. Set POWE R S w i t ch t o O F F .
19. Dis c o n nec t t e st e q u ipment .