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

 

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FUNCTIONAL OPERATION.
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TM-11-4920-296-14-P Transponder Set Test Set AN/APM-378 (NSN 4920-00-134-1533) Manual
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SIF MODES


TM 11-4920-296-14&P
Table 2-4. Transponder Set Test Set AN/APM-378, Characteristics
Duty Cycle...........
1%
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
1
2
3/A
C
Test
4
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.


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