Aeroflex ATC-1400A-2 - XPDR;DME Pulse Spacing and Shaping Procedure

MAI NTENANCE MANUAL
ATC-1400A-2
2-2-2
Page 2 2
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
(7) XPDR/DME Pul s e S pac i n g and S h a p ing
PREREQUISITES : 2-2- 2 D ( 1 ) P ower S u p p l y
TEST E Q U I P M E N T : 1 O s c i llos c o p e
1 Sign a l G e n era t o r
1 Heter o d y ne Moni t o r
3 50 Ω Coa x i a l Cabl e s (BNC to B N C )
SET-UP D I A G R A M: 2-2- 2 , F i gure 3 0
N O T E : Dur i n g per f o r mance o f t his p r o cedu r e , if a c ert a i n co n d i tio n o r sp e c i fic a t i on
cann o t b e ve r i f ied, r e f er t o a ppro p r i a te a s sembly t e s t p r o c e dur e i n 2-2 - 4 for
test i n g an d r e pai r o f fa u l t y as s e m b l y.
STEP PROCEDURE
1. Set A T C - 1 4 00A- 2 c o ntro l s a s f o l l o ws:
CONTROL SETTING
CW/NORM/OFF Switc h N O R M
SLS/ECHO ON/OFF S w i t c h O F F
XPDR PULSE WI D T H V A R / C A L Switch CA L
FREQ STE P R A T E Control O F F
MAN/AUTO/MAN STEP Switc h M A N
XPDR DEV P
3
/CAL Swi t c h CA L
XPDR DEV P
2
/CAL Swi t c h CA L
TO /TAC/TD Sw i t c h T O
PRF/SQTR ON/OFF S w i t c h O N
XPDR MODE Contro l A
PRF/SQTR T h u m b w h e els 2 0 0 0
FREQ/FUNCT I ON S E L E C T Thumbwhee l s 1 0 9 0 X P D R
SLS/ E C H O T h u mbwheels - 0
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. S e t POWER S w i t c h to O N a n d all o w 1 0 minut e w a r m-up pe r i o d.
4. A djus t R F LEVE L C o n trol f o r - 1 2 d B m a s di s p l aye d o n RF L E V E L -dBm Di s p lay.
5. Set O s 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 0.00 5 V /Div
Trigg e r S ourc e C o n t rol EXT S Y N C T r i gger
Main Swe e p 5 µs/Div
6. Adju s t v ert i c a l Ve r n i e r Con t r o l fo r a 0 t o 1 0 0% f u l l dis p l a y of P
1
pul s e on
Oscil l o sco p e .
7. Set Os c i l losc o p e Time S w i t c h t o O N a n d Swee p D e lay Co n t r ol t o 0 .05 µs /Div .
8. Verif y P
1
pul s e r ise a n d fa l l t ime, f r o m 1 0 % to 9 0 % po i n t , is 7 0 ns ( + 1 0 ns ,
-20 n s ) .