MAI NTENANCE MANUAL
ATC-1400A-2
2-2-2
Page 1 4
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
28. Dec r e a s e R F L E VEL C o n t r ol i n 1 dB in c r e ments f r o m - 3 0 to - 1 1 0 dBm. V e rify
RF LE V E L -dBm Di s p l a y an d S p e ctru m A n a l yzer r e f l ect s a m e R F LEV E L
(±0.5 d B f r om -30 t o - 90 d B m a n d ±0.7 d B f r om -90 t o - 1 10 d B m) .
NOTE: Dep e n d ing o n Spec t r u m Anal y z e r use d , a 30 d B Amplif i e r may b e
nece s s a ry o n R F I/O Co n n e cto r t o di s p l ay l e v e ls b e l o w -1 0 0 d Bm.
29. Set A T C - 1 400 A - 2 cont r o l s as f o l l ows:
CONTROL SETTING
RF LEV E L C o ntrol 0 dBm
CW/NORM/OFF Switc h CW
PRF/SQTR T h u m b w h e els 0000
FREQ/FUNCTI ON S E L E C T Thumbwhee l s 1090 X P D R
30. Set S p ectr u m A n a lyz e r r efer e n c e le v e l to 0 d B m.
31. Adj u s t Spe c t r u m Anal y z e r Cent e r Fre q u e ncy t o pos i t i on p e a k a mpl i t u de o f CW
sign a l at c e n t er o f d isp l a y .
32. Set C W / N O R M / O F F S w itch t o O F F a nd S p e c tru m A n a l y zer R e f e renc e L evel f o r
-70 d B . Veri f y 80 dB i s dis p l a yed o n Spe c t r um Ana l y z er.
33. Set FR E Q/ F U N C T I ON SELEC T T h u m b w h eels t o 1 09 0 M H z X . Ve r i f y 80 d B c is
disp l a y ed o n S pec t r u m Anal y z e r.
34. Se t S p ect r u m A n aly z e r res o l u tion t o 50 k H z . Ve r i f y ph a s e noi s e i s 5 5 d B c at
150 k H z f rom c e n t er f r e q uen c y .
35. 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 X . Veri f y pha s e n ois e
is 5 5 d Bc a t 1 50 k H z f rom ce n t e r f r e q uenc y .
36. Set S p ectr u m A n a lyz e r c ontr o l s as f o l l ows:
CONTROL SETTING
Sens i t ivi t y C o ntr o l 10 dB/ D i v
Dispe r s i on Co n t r ol 1 MHz/Div
Sweep C o n t r ol 50 ms / D i v
Refer e n c e L e v e l 0 d B m
NOTE: Do n o t ove r d r ive S p e ctru m A n a lyze r v er t i c al a mp l i f ier , a s th i s giv e s a
fals e i ndi c a t i on o f s pur s o n AT C - 1 4 0 0A- 2 R F l eve l o utpu t .
37. Aft e r veri f i c a tio n o f sig n a l fro m A T C - 1 4 0 0A- 2 i s ref e r e n ced a t 0 dB , s e t
Spec t r u m A naly z e r refe r e n ce l e v e l to - 2 0 dB.
38. Wh i l e tun i n g Spe c t r um Anal y z e r ce n t er f r e quen c y fro m 3 5 0 to 1 8 0 0 MHz, ve r i f y
any o r all s p u rs a p p ear i n g on d i s pla y a re 6 0 d Bc.
39. Set FR E Q/ F U N C T I ON SELEC T T h u m b w h eels t o 1 100 MHz .
40. Wh i l e tun i n g Spe c t r um Anal y z e r ce n t er f r e quen c y fro m 3 5 0 to 1 8 0 0 MHz, ve r i f y
any o r all s p u rs a p p ear i n g on d i s pla y a re 6 0 d Bc.
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