MAI NTENANCE MANUAL
ATC-1400A-2
2-2-2
Page 1 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
(4) RF Che c k a nd L e v el
PREREQUISITES : 2-2- 2 D ( 1 ) P ower S u p p l y
2-2-2 D ( 7 ) X PDR/DME Puls e S h apin g
TEST E Q UI P ME N T : 1 F r e quenc y C o u n ter
1 Power Me t e r with 5 1 0 7 5 Se n s o r
1 Spec t r u m Analy z e r
1 Power S u p ply
1 50 Ω Coa x i a l Cab l e ( BNC to T y pe N)
1 VSWR B r i d g e
SET-UP DIA GRAM: None
NOTE: 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 pr 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 fo l l o ws:
CONTROL SETTING
CW/NORM/OFF Switc h CW
TACAN ON/OFF S w i t c h OFF
XPDR MODE Contro l A
FREQ/FUNCT I ON / S E L E C T Thumbwhee l s 1000 X P D R
∆F T h u m b w h e els 000 OF F
2. Conne c t F requ e n c y Cou n t e r to R F I / O Conne c t o r (J1 5 ) .
3. S e t POWER S w i t c h to ON. A l low a 1 0 m i n ute w a r m - u p per i o d .
4. A djus t R F LEVE L C o ntrol f o r 0 dB m a s d i sp l a y ed on R F LEVEL - d B m Disp l a y .
5. Ver i f y fre q u e ncy d i spl a y e d o n F r equ e n cy Co u n t er i s 1 000 M Hz ( ±1 0 kHz ) .
6. 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 9 0 XPDR.
7. Remove F r e q u ency C o u n ter f r o m R F I/O Conn e c t or (J 1 5 ) . Con n e c t Powe r M e t e r
to RF I / O C o n n ecto r ( J 15).
8. Veri f y p ower l e v el d i s p laye d o n Po w e r M e t er i s 0 dBm. A d j u st R3 2 2 9
(ALC/Mix e r A ssembl y ) ( 2-2- 2 , F igur e 2 6 ) a s n e eded f o r pr o p e r RF p o w e r leve l .
9. Remove S MB c o a xia l c o nne c t o r fr o m J 320 2 ( A LC/Mixer A s sembly ) ( 2 -2-2 , F i gure
26). V e rify R F p o wer l e v e l (AL C h e a dro o m) i n crea s e s minimum of 4 d B fr o m
leve l i n St e p 8.
10. Usi n g e xte r n a l Powe r S uppl y , a ppl y 5 Vd c t o ce n t e r c o n d uct o r o f J 3 2 0 2
(ALC/Mix e r A ssembl y ) ( 2-2- 2 , F igur e 2 6 ). V e r ify R F o utpu t l evel d e crea s e s
minimum of 4 d B fro m l e v e l in S t e p 8 .
11. Remove e x t ern a l P ower S u p ply f r o m J 320 2 . Reco n n ect c o a xia l c abl e t o J3 2 0 2.
12. Set FR E Q/ F U N C T I ON SELEC T T h u m b w h eels t o 9 62 MHz . V erif y R F powe r l e vel
is 0 d B (±0.6 d B ) .
13. Dis c o n nec t c oax i a l ca b l e fr o m J 3 2 02. Veri f y RF powe r l e vel ( A L C h eadr o o m )
incr e a s es min i m u m o f 4 dB m f r o m l evel i n Ste p 1 2.
14. Usi n g e xte r n a l Powe r S uppl y , a ppl y 5 Vd c t o ce n t e r c o n d uct o r o f J 3 2 0 2
(ALC/Mix e r A ssembl y ) ( 2-2- 2 , F igur e 2 6 ). V e r ify R F o utpu t l evel d e crea s e s
minimum of 4 d B fro m l e v e l in S t e p 1 2 .
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