Table 2-4. Transponder Set Test Set AN/APM-378, Characteristics

TM 11-4920-296-14&P

Duty Cycle...........

Receiver:

Beamwidth - Horizontal . . . . , . . . . . 400 to 80 (3 dB points)

Beamwidth - Vertical . . . . . . . . . . . 5 to +50 (amplitude variation less than 6 dB

Interrogation Pulses:

Mode

Pulse Width

Spacing

3/A

Test

Mode 4 spacing

Reply Pulses - Analysis Capability:

Pulse Spacing Variation . . . . . . . . . .

(from correct nominal)

- REJECT

(With or without F3 pulse.)

Side Lobe Suppression . . . , . . . . . . . . .

SLS control pulse alternates between 0 and 11

Control Pulse Spacing . . . . . . . . . . .

Mode . . . . . . . . . . . . . . . . . . . . .

ACCEPT indication for correct replies to

> 80% or 40% (see paragraph 2-39) of

interrogations.

SIF and I/P:

I/P . . . . . . . . . . . . . . . .

........

Mode C, with or without SIF pulse.

I/P . . . . . . . . . . . . . . . .

........

Mode 1, 2, 3/A, Test. (SIF Modes).

Emergency/Frequency/Power

Checks:

Frequency . . . . . . . . . . .

........

Power . . . . . . . . . . . . . . . . . . . . . .

Self-Test . . . . . . . . . . . . . . . . . . . . . .

Checks test set circuits for all modes of

operation.

2-5