Transmitter Power and Pulse Adjustments

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

4-4. Transmitter Power and Pulse Ad-

a Standard Test Equipment. The following

justments

chart lists the Army test equipment required for

the tests.

NOTE

See paragraph 4-7 when using

AN/TPM-25A.

Test equipment

Technical manual

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

TM 11-6625-200-15

Wattmeter AN/URM-98 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

TM 11-6625-433-15

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

TM 11-6625-1703-15

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

TM 11-6625-1644-12/NAV-

A I R 16-30APM270-1 To

38D9-62-5-1

b. Test Setup. Instructions for the applicable

A16TP2. Adjust variable capacitor A16C12 for a

test setup are provided in c and d below. Test

maximum peaked meter indication. The voltage

should be -16 volts dc minimum.

point location is shown in figure 3-6 and ad-

justment control location in figure 3-7.

(11) Disconnect the dc probe from A16TP2,

c. Preliminary Procedure. The preliminary

and set the ME-26B/U SELECTOR switch to

(+).

procedure is given in (1) through (12) below. The

final adjustment is in d below.

(12) Connect the dc probe to test point

A16TP3. Adjust variable capacitors A16C17 and

NOTE

A16C18 for a maximum peaked meter indication.

Wattometer AN/URM-98 should be

The voltage should be 6 volts dc, minimum.

warmed up for 15 minutes before final

d. Find Power Level Adjustments.

adjustments are made.

(1) Turn on the equipment, and permit a

(1) Remove the transmitter from its case

15 minute warmup. Connect test point A13TP2

(para 3-10).

(ground to A4TP5 (fig. 3-6).

(2) Use the test setup in figure 3-1.

(2) Set the test set FUNCTION control

(3) Set the ME-26B/U SELECTOR switch

SYSTEM, MODE switch at 1, and ISLS switch

at(+) and RANGE switch at 300V.

to OFF.

(4) Apply power to the test set, and set the

(3) Set the Summation Bridge TS-779A/U

test set PRESS TO TEST switch at LOCK and

RANGE switch at O DBM.

MODE switch at 1.

Waveguide

Probe

( 4 ) Disconnect

(5) Perform the procedure in paragraph 4-3c.

M X - 2 1 4 4 A / U from the AN/APM-123(V)l

(6) Disconnect the dc probe from test point

PROBE connection. Adjust the TS-779A/U

A14TP3, and set the ME-26B/U RANGE switch

meter to zero with the ZERO control.

at 30V.

(5) Reconnect the MX-2144A/U to the

(7) Connect the dc probe to test point

AN/APM-123(V)l PROBE connection. Observe

A16TP4. Adjust control A16A2R1 for +18.05

the meter indication. The power should be

volts.

6dbm.

(8) Disconnect the dc probe from A16TP4

NOTE

and set the ME-26B/U SELECTOR switch to

I f necessary: adjust the test set

().

A16A1C2 and power controls A16R6

(9) Connect the de probe to test point

( f i g . 3-7) to obtain performance

A16TP1. Adjust variable capacitor A16C6 for a

standards.

maximum peak meter indication. The voltage

should be 16 volts dc minimum.

(6) Disconnect test point A13TP2 (ground

(10) Connect the dc probe to test point

from A4TP5, and connect it to test point A4TP4.

4-2

Change 5