Final Test Procedures

TM 11-6625-922-15

until DELAY meter reads 10 (full scale).

capacitor C9 on A2 to obtain a reading on the AN/TSM-

16 of 200,000 Hz.

(8) Repeat the procedures in (5), (6), and (7)

(3) Operate SWEEP CALIBRATE switch to

above until no further adjustment is required.

SWEEP, CARRIER FREQUENCY control fully ccw,

(9) Operate DELAY METER RANGE MS

SWEEP WIDTH control fully ccw, and SWEEP

switch to .5-.5, COARSE DELAY MS switch to 0-10,

CALIBRATE switch to LOW CAL. Adjust C1 on A2 to

FINE DELAY MS switch to 0.5, and adjust DELAY

obtain a reading on the AN/ TSM-16 of 200,000 Hz.

ZERO ADJ control until DELAY meter reads 0 (black 0-

g. Input Amplifier Gain. Connect Signal Generator

.5 scale).

AN/URM-127 to the tip and ring terminals of the BAL

(10) Operate FINE DELAY MS switch to 0, and

RECEIVE jack. Using Voltmeter, Electronic ME-30E/U

adjust R52 on delay output assembly A8 until DELAY

as a monitor, adjust the AN/URM-127 level, at 1 kHz, to

meter reads .5 (full scale).

0.775 volt into the BAL RECEIVE jack. Operate the %

(11) Repeat the procedures in (9) and (10)

MOD-RECEIVE LEVEL-TRANSMIT LEVEL switch to

above until no further adjustment is required.

RECEIVE LEVEL.

Adjust R9 on input amplifier-

i. Receive Level Variation. Perform the procedure

demodulator assembly A6 to obtain a reading of 0 on

in g(1), (2), (3)., and (4) above. Operate TRANSMIT

the dbm/% MODULATION meter.

LEVEL DBM control fully cw. Operate MODULATION

h. Delay Meter Scaling.

FREQUENCY HZ switch to 250. Operate DELAY

(1) Connect a jumper cable between the BAL

METER RANGE MS switch to .15-.5.

Operate

TRANSMIT and BAL RECEIVE jacks.

COARSE DELAY MS switch, FINE DELAY MS switch,

(2) Operate MODULATION FREQUENCY HZ

and DELAY ZERO ADJ control until DELAY meter reads

switch to 25 and % MOD-RECEIVE LEVEL-TRANSMIT

near center scale. Note this position. Operate the

LEVEL switch to % MOD.

TRANSMIT LEVEL DBM control (operate the

TRANSMIT LEVEL DBM switch, also if needed) until the

(3) Operate % MOD ADJ control to obtain

indication is -6 on the dbm/% MODULATION meter.

indication of 45-50 on dbm/% MODULATION meter.

Note the reading on the DELAY meter. If a change of

(4) Operate % MOD-RECEIVE LEVEL-

1/2 of a division or more occurred, adjust R68 on delay

TRANSMIT LEVEL switch, to RECEIVE LEVEL and

output assembly A8 so a difference in receive level of 6

RECEIVE LEVEL DBM switch to obtain dbm/ %

db will cause less than 1/2 a division change in the

MODULATION meter indication between -10 and 0.

DELAY meter indication. A similar procedure is used for

(5) Operate DELAY METER RANGE MS

the other two modulating frequencies. For the different

switch to 3--10 and COARSE DELAY MS switch to 0-10.

modulation frequencies, adjust the following resistors:

(6) Operate DELAY ZERO ADJ control until

Mod freq (Hs)

Resistor

DELAY meter reads 0 (black 0-10 scale).

250

R68

(7) Operate COARSE DELAY MS switch to

83 1/3

R59

30-40 and on delay output assembly A8, adjust R55

R58

6-8. Final Test Procedures

Step

Condition

Requirement

Make sure the internal power supply connec-

tions are set for the proper primary supply

voltage (fig. 2-2 and 9-86).

Operate SWEEP-CARRIER-REFERENCE

Frequency range should be at least 100 Hz to 552 kHz.

switch to CARRIER. Operate RANGE

(KHZ) switch and CARRIER FREQUENCY

control to vary the frequency. Monitor

frequency on FREQUENCY display.

Operate SWEEP-CARRIER-REFERENCE

Same as step 2.

switch to REFERENCE. Operate RANGE

(KHZ) switch and REFERENCE FRE-

QUENCY control to vary frequency. Moni-

tor frequency on the FREQUENCY display.

6-4