Receiver Reference Code, Emergency and I/P Function Operation

Receiver Frequency and Bandwidth

Table 4. Emergency and I/P Function

TB-9-4920-358-35 Calibration Procedure for Transporter Set Test Set AN/APM-378 Manual
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TB 9-4920-358-35

(3) On radar test set, select Menu 10 and increase radar test set main output

frequency until TI REJECT lamp comes on. Decrease frequency until TI ACCEPT lamp

just lights. Record frequency.

(4) Decrease radar test set main output frequency until TI REJECT lamp comes

on, then increase frequency until TI ACCEPT lamp just lights. Record frequency.

(5) Subtract lower frequency recorded in (4) above from upper frequency recorded in

(4) above. Bandwidth will be between 6 and 8 MHz.

(6) Compute center frequency by adding the frequencies recorded in (4) and (5)

above and dividing by 2. Center frequency will be between 1089.5 and 1090.5 MHz.

b. Adjustments. No adjustments can be made.

10. Receiver Reference Code, Emergency and I/P Function Operation

a. Performance Check

(1) Set TI SYSTEM TYPE switch to SINGLE CHANNEL.

(2) Initialize radar test set by selecting FUNCTION and ENTER. Set radar test

set INTERROGATOR menus as listed below:

(a) Menu 3 - M1 through MC REPLY CODES to 7700, RANGE DELAY to 0

s, SIF2 to OFF.

(b) Menu 4 - SIF CODE to 7700, DELAY to 3 s, TRIG SOURCE to

EXTERN+.

(d) Menu 16 - SOURCE to LOW PWR, and RF to - 0.

(3) Select radar test set Menu 16, POWER, and ENTER to perform measurement

sequence. Press up or down arrow to stop measurement.

(4) Set TI REFERENCE CODE pushbuttons and radar test set REPLIES SIF

CODE in turn to settings listed in table 3, and observe the correct ACCEPT or REJECT

indications as listed.

Table 3. Receiver Reference Code

Radar test set

M2 REPLIES

REJECT or

SIF REPLY

Test instrument

ACCEPT

CODE

REFERENCE

CODE

conditions

(menu 3)

7700

1111

REJECT

1111

2222

REJECT

2222

3333

REJECT

3333

4444

3333

REJECT

4444

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