Calibration of Transmitter Meter 1A16M2

TM 11-5820-695-35

connector 1A16W25XA2 (fig. 3-2 and 5-15(1)).

Turn Test Set, Electrical Meter TS-656/U on

Connect a test lead between the COMMON

and allow a 5-minute warmup period.

terminal on T-6/U and pin 9 of 100 MHz oscillator

On the TS-656/U, set the FUNCTION switch

connector 1A16W25XA2.

to DIR CUR, the CURRENT switch to 100 MICRO-AMP,

On TS-656/U, hold the TEST switch in

and turn the DECREASE/ INCREASE control

TEST (up) position and turn the DECREASE/

counterclockwise until mechanical stop is reached.

INCREASE control in INCREASE direction (clockwise)

Connect the red test lead supplied with

until indication on meter 1A16M2 reaches SET OSC

TS656/U between the DIR CUR terminal on TS656/U

LEVEL ADJ.

and the TEST LEAD jack on meter panel assembly

With the TEST switch on TS-656/U in the

1A15A8.

up position, the meter on TS-656/U should indicate 40

Connect the black test lead supplied with

+2.0 microamperes. If it does not, replace meter

TS-656/U between the COMMON terminal on TS-656/U

1A16M2 (para 3-35) and repeat the calibration

and the El CABINET GROUND lug on top of electrical

procedure.

equipment cabinet 1A15 (fig. 3-7).

Turn the TS-656/U off and disconnect the

On TS-656/U, hold the TEST switch in

test leads.

TEST (up) position and turn the DECREASE/

Reinstall component 1A2 and connect

INCREASE control in INCREASE direction (clockwise)

cables 1A2W1 and 1A2W2.

until meter 1A15A8M1 indicates 150.

Turn meter switch 1A16S5 on the radio test

With the TEST switch on TS-656/U in the

set meter panel to OFF (TRANSIT).

up position, the meter on TS-656/U should indicate 37.5

1.5 microamperes. If it does not, replace meter

Set the POWER ON/OFF switch 1A15A8S3

1A15A8M1 (para 321a) and repeat the calibration

on meter panel assembly 1A15A8 to ON.

procedure.

3-57. Calibration of T-1054(P)/GRC-l44(V) Reflected

Turn the TS-656/U off and disconnect the

RF Power Metering Circuit

test leads.

Turn on Test Set, Radio Frequency Power

Set POWER ON/OFF switch 1A15A8S3 on

AN/USM-161 and allow a 30-minute warmup period.

meter panel assembly 1A15A8 to ON.

Calculate the calibration plate correction

3-56. Calibration of Transmitter Meter 1A16M2

factors of the CN-845/USM-161 and CG-2514/U (fig. 3-

Set POWER ON/OFF switch 1A15A8S3 on

29) for a 4800 MHz input. Algebraically add the

meter panel assembly 1A15A8 (fig. 3-1) to OFF.

correction factors noting the plus or minus sign.

Turn meter switch 1A16S5 on the radio test

Calibrate the AN/: USM-16,1 using the

set meter panel to OFF (TRANSIT).

procedure given in TM 11 49812.

Using a screwdriver, adjust the screw on

On the AN/USM-161, set BIAS-READ

front of meter 1A16M2 (fig. 3-12) for a zero meter

switch to REAM, turn the POWER RANGE switch to 10

indication (a zero meter indication is obtained when the

MW +10 DBM, set the COMP ATTENUATOR dial to

meter pointer rests on the thin black line located to the

the value recorded in step b above, and set the POWER

left of the yellow meter band).

indicator dial for a dial scale indication of .75 on the

outermost scale.

Disconnect cables 1A2W1 and 1A2W2 and

remove 100 MHz oscillator 1A2.

Set Switch, Waveguide SA-1679/GRC to

the TO LOAD (TEST) position.

Set radio test set switch 1A16S5 to the OSC

LEVEL position.

Record

the

T-1054(P)/GRC-144(V)

operating frequency and then set the controls on

Turn Test Set, Electrical Meter TS-66/U on

electrical frequency synthesizer 1A14 to 4800.0 MHz.

and allow a 5-minute warmup period.

If the RF POWER indicator on meter panel

On the TS--656/U, set the FUNCTION

assembly 1A14A8 is not lighted red, adjust the PUSH

switch to DIR CUR, the CURRENT switch to 100

TO TURN knob on radio frequency bandpass filter 1FL3

MICRO-AMP, and turn the DECREASE/ INCREASE

until it lights red.

control counterclockwise until mechanical stop is

reached.

Connect a test lead between the DIR CUR

terminal on TS-656/U and pin 5 of 100 MHz oscillator

Change 6

3-76