Section III. MODE 4 ALIGNMENT

TM 11-6625-667-45/NAVAIR 16-30APM123-2/TO 33A1-3-367-22

Section

III.

MODE 4

ALIGNMENT

p r o v i d e d for each alignment procedure. The first

NOTE

procedure uses conventional test equipment in

See Section V when

using

with the Radar Test Set

conjunction

AN/TPM-25A.

AN/UPM-98A and AN/UPM-98B. The second

5.1-10. General

procedure uses

the Radar Test Set

AN/UPM-137A. Refer to figure 5.1-10 for ad

The test equipment listed in paragraph 5.1-11, or

j u s t m e n t control location.

approved equivalent, is required to perform

a l i g n m e n t p r o c e d u r e s . TW O p r o c e d u r e s a r e

5.1-11. Test Equipment Required for Alignment

Technical manual

Test equipment

TM 11-6625-1703-14

Oscilloscope AN/USM-281A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Wattmeter AN/URM-98 (including Test Set, Radio Frequency Power

TM 11-6625-433-13

TS-779A/U and Bolo Meter, Radio Frequency MX-2144A/U) . . . . . .

Test Facilities Set, Transponder Test Set AN/APM-270(V). . . . . . . . . .

TM 11-6625-1644-12

TM 11-6625-299-15

Generator, Signal AN/URM-64A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Modulator MD-796

TM 11-6625-366-15

Multimeter TS 352 B/U . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Multimeter ME 26B/U . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

TM 11-6625-200-15

Test Set, Radar AN/UPM-137A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

NAVELEX 0969-158-1010

NAVAIR 16-30UPM137-6-1

AIR FORCE T.O.

33AI-8-426-21-1 AND

NAVELEX 0969-158-1020

NAVAIR 16-30UPM 137-6-2

AIR FORCE T.O.

33AI-3-426-21-2

5.1-13. Mode 4 Receive Sensitivity and Reply

5.1-12. Power Supply Adjustment

Video Adjustments

a. Connect equipment as shown in figure 3-1.

a. S e t a n d a d j u s t t h e A N / A P M - 2 7 0 ( V ) c o n -

b. Set the ME-26B/U RANGE control to 10V.

c. C o n n e c t t h e M E - 2 6 B / U d c p r o b e t o t e s t

trols as follows:

(1) CONSECUTIVE REPLIES to 64.

point A3TP1.

(2) SPACING PULSE 2 to 0.

d. A d j u s t c o n t r o l A 3 R 2 4 u n t i l t h e M E - 2 6 B / U

(3) SPACING PULSE 3 to 0.

indicates 5 0.1 volts.

( 4 ) SYNC GAIN to midposition.

e . Disconnect the ME-26B/U from the test set.

( 5 ) REPLY MODULATION 1X-2X to 1X.

f. C o n n e c t t h e e q u i p m e n t a s s h o w n i n f i g u r e

b. Set the transponder test set controls as

5.1-2.

follows:

g. S e t t h e T S - 3 5 2 B / U F U N C T I O N s w i t c h t o

(1) FUNCTION to SYSTEM.

D C + CURRENT and range switch to 500MA.

h. A d j u s t c o n t r o l A 3 R 3 f o r a m u l t i m e t e r i n

(2) MODE to 4.

dication of 400 20 milliamperes.

(3) DIR-RAD to RAD.

(4) ISLS to OFF.

c. A p p l y P O W E R T O T H E E Q U I P M E N T

A N D PERMIT A 14-minute warmup period.

5.1-20

Change 5