Aeroflex ATC-1400A-2 - TACAN AM Calibration Procedure

MAI NTENANCE MANUAL
ATC-1400A-2
2-2-2
Page 1 6
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
(5) TA CAN AM
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 Modula t i o n Meter
1 50 Ω Coa x i a l Cab l e ( BNC to T y pe N)
1 50 Ω Coa x i a l Cabl e ( B NC to B N C )
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
DME DEV P
2
/CAL Swi t c h CAL
TO /TAC/TD Sw i t c h TAC
PRF/SQTR ON/OFF S w i t c h ON
IDENT TONE/ OFF / C O D E S w i t ch OFF
TACAN ON/OFF S w i t c h OFF
DME REPLY EFF I C I E N C Y Control 100%
PRF/SQTR T h u m b w h e els 2000
FREQ/FUNCTI ON S E L E C T Thumbwhee l s 109 0 M H z Y
∆F T h u m b w h e els 000 OF F
2. A djus t R F LEVE L C o n trol f r o m -50 dB m t o 3 dB p a s t Lo c k - O n , on Mo d u l atio n
Meter, a p p rox i m a t e l y - 2 5 d Bm, as d i spla y e d on R F L E VEL - d B m D i spla y .
CAUTION: DO NOT OVERDRIVE INPUT T O MODULATION METER, AS T H I S
CAUSES ERRONEOUS % MODULATION READINGS ON THE
MODULATION METER DISPLAY.
3. Connec t M o d u lat i o n Meter t o R F I/O Con n e c t or.
4. Set Mod u l a tion Me t e r con t r o l s as f o llows :
CONTROL SETTING
Tunin g ( A uto/ E x t ) Auto
High P a s s Fi l t e r (Hz) 300
Low Pa s s Filt e r (kHz ) 3
Peak Pk-P k / 2
Range 10
Fun c t i on kH z Devi a t ion
5. S e t POWER S w i t c h to ON a n d allo w 1 0 minute w a r m-up pe r i o d.
6. Veri f y pea k t o pe a k F M is < 5 k Hz at 1 0 9 0 MHz.
7. 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 9 6 2 MHz. V e r ify p e a k to p e ak
FM is ≤5 k Hz.
8. 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 2 13 MHz . V erif y p e ak t o p eak
FM is ≤5 k Hz.
9. S et TAC A N O N / O F F S w itch t o O N . C o nne c t O s cill o s c ope e x t ern a l tri g g e r to
SYNC Con n e c tor ( J 2 0) a n d Oscil l o s cop e C h a nne l A, u s i n g X1 0 p r obe, t o P320 1 ,
Pin 7 ( A L C/Mixer A s s e mbly) ( 2 - 2 -2, F i g u re 2 6 ) .