Aeroflex ATC-1400A-2 - Page 13

MAI NTENANCE MANUAL
ATC-1400A-2
2-2-2
Page 1 3
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
15. 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.
16. Set FR E Q/ F U N C T I ON SELEC T T h u m b w h eels t o 1 213 MHz . Verif y R F power
leve l i s 0 d B (±0.6 d B ) .
17. 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 6.
18. 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 co n d u ctor o f J32 0 2 . Ve r i f y
RF out p u t le v e l dec r e a ses a m i n i mum of 4 d B fro m l e v e l in S t ep 1 6 .
19. Remove e x t ern a l P ower S u p ply f r o m J320 2 .
20. Reco n n e ct S MB c o axia l con n e c tor t o J32 0 2 .
21. Set FR E Q/ F U N C T I ON SELEC T T h u m b w h eels t o 1 090 X P D R .
22. Ve r i f y RF p o w e r leve l d ispl a y e d on P o w e r Mete r i s 0 d B m . A djus t R 3 2 29
(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 .
23. Usi n g P ower Me t e r , ve r i f y RF p o w e r leve l a s sho w n i n 2-2 - 2 , Tab l e 48 f o r
frequ e n c i es s e l ect e d o n FREQ/F U N C T I ON SELE C T T h umbwhee l s .
FREQ/FUNCTION SELECT THUMBWHEELS S E T T I N G R F P O W E R OUTPUT
962 MHz
100 0 M H z
105 0 M H z
110 0 M H z
115 0 M H z
121 3 M H z
0 dBm (±0. 6 d B )
0 dBm (±0. 6 d B )
0 dBm (±0. 6 d B )
0 dBm (±0. 6 d B )
0 dBm (±0. 6 d B )
0 dBm (±0. 6 d B )
RF Powe r L evel v e rsu s F r equ e n c y
Tabl e 4 8
24. Set FR E Q/ F U N C T I ON SELEC T T h u m b w h eels t o 1 090 MHz .
25. D e c r eas e R F LEVE L C o ntro l i n 1 dB i n c rements f r om 0 to - 3 0 dBm. V e r ify R F
LEVE L - d Bm disp l a y and P o w e r Meter r e f lect s a m e RF l e v e l ( ±0 . 3 d B).
26. Disc o n n e ct P o w e r Meter f r o m R F I /O Con n e c tor. C o n n ect V S W R Brid g e w i th
Spec t r u m A n alyz e r t o RF I / O C o n n ecto r . V e r i f y VS W R , o n Spe c t r u m Anal y z e r ,
is 1 . 2 : 1 fr o m 1 0 2 0 to 1 1 55 MHz.
27. Disc o n n e ct V S W R B ridg e f r om RF I/ O C o n n ecto r . Conne c t S pec t r u m A naly z e r
to RF I / O C o n n ecto r . Set S p e c trum A n a l yzer c o ntro l s as f o l l ows:
CONTROL SETTING
Cente r F req u e n cy Co n t r ol 1090 M H z
Sens i t i vit y C o n tro l 2 dB / D i v
Vide o F i lte r C o n trol 30 0 H z
Dispe r s ion C o n tro l 50 k H z / D i v
Band w i d t h Con t r o l 3 0 k Hz
Refer e n c e Le v e l -30 d B m
Sweep C o n t rol 20 ms/ D i v