MAI NTENANCE MANUAL
ATC-1400A-2
2-2-2
Page 1 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
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 0 .
3. Set S i g n al Gene r a t or f o r 1 090 MHz a t + 5 dB m.
4. Set Os c i l los c o p e c o n t rol s a s fo l l o ws:
CONTROL SETTING
Vert i c a l S e n s i tiv i t y Cont r o l 0.01 V / D i v
Trigg e r S ourc e C o n t rol EXT S Y N C T r i gger
5. Usin g V e rni e r C o ntr o l , pos i t i on p e a k of p o s itiv e g oing P
1
pul s e o n t h i r d
hori z o nta l a x is ( o n e gr a t icul e d ivi s i o n a b o ve ma j o r hor i z o ntal a x is). A djus t
ver t i c al v e r n ier s o P
1
pul s e ampli t u d e i s f ive g r ati c u l e d i v i sio n s on Os c i llo s c o pe
dis p l a y.
6. Set Os c i l los c o p e V e r t ical S e nsi t i v ity C o n t rol t o 0.0 0 5 V /Div.
7. Usin g p o sit i o n ing c o ntro l , pos i t i on p e a k of P
1
pul s e on h o r i zon t a l ax i s one
grat i c u le p o s i tio n f rom to p o f CRT d i s p l ay.
8. S et CW / N O R M/OFF S w i t ch to C W . Veri f y diff e r e nce b e t ween t r a n spo n d e r pul s e
lev e l and C W i s ≤2 % .
9. S et CW / N O R M/OFF S w i t ch to N ORM, FRE Q/F U N C T I O N S ELECT T h u mb w h e e l s
to MHz X a n d T
O/TAC/TD Sw i t c h to T D .
10. Ve r i f y di f f e renc e b etwee n D M E p ulse l e vel a n d CW i s ≤2%.
11. Set P R F / SQTR Thu mbwh e e l s to 1 0 1 0. R e c o rd r e f e r ence l e v e l. S e t P RF/SQTR
Thu mbwh e e l s t o 1 0 an d v eri f y % ch a n g e i s <1% .
12. Set T
O/TAC/TD Sw i t c h to T O , P R F / SQTR Th u mb w h e e l s to 1 0 10 a n d
FREQ/FUNCT I ON S E L E C T Thumbwhe e l s to 10 9 0 X P DR.
13. Reco r d r efe r e n c e le v e l . S e t P RF/SQTR T h u m b w h e els t o 10 a n d ve r i f y % c h a nge
is < 1 % .
14. Usi n g pos i t i oni n g c ont r o l , po s i t ion p e ak o f P
1
pul s e on h o r i zon t a l ax i s one
grat i c u le f r o m t op o f C R T d isp l a y .
15. Set XPDR P U L S E W I D TH VAR/CAL S w i t c h to V A R a n d XPDR PULSE W I D T H
Thumbwh e e l s
to 0 . 2 0
µ
s. V e r i fy c h a nge i n a mplit u d e is < 3 % .
16. Set X P D R P U L SE W I D T H T h umbwheels t o 0.4 5
µ
s. V e r i fy c h a n ge i n a mplitu d e
is < 2 % .
17. Dis c o n nec t t est e q u ipmen t a n d c o n n ect p o wer me t e r sens o r t o ATC-1 4 0 0 A -2
RF I/O a s s hown i n F igur e 3 1.
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