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|  MIL-N-81207A(AS)
Pulse Rise and Fall Time - The time required
3.4.2.1
for the leading edge of the pulse to rise from 10 to 90 percent of
its maximum voltage amplitude shall be 2.5 0.5 microsecond.
Correspondingly the fall time shall be 2.7 1.3 microseconds.
Pulse Coding (Mode X Channels) - The pulses
3.4.2.2
shall be coded in pairs with a spacing which shall be 12 0.5
microsecond as measured at the 50 percent maximum voltage
amplitude points from the leading edge of the first pulse of the
leading edge of the second pulse. The X mode A/A interrogating
pulse spacing shall be 12.0 0.5 microseconds.
Pulse Codinq (Mode Y Channels) - The equipment
3.4.2.3
shall be capable of using ground reply pulses, coded in pairs with
a spacing of 30 0.5 microsecond as measured at the 50 percent
maximum voltage amplitude points from the leading edge of the
first pulse of the leading edge of the second pulse. The Y mode
AIR-TO-AIR interrogating pulse spacing shall be 24 0.5
microseconds.
Squitter Distribution - The received squitter
3.4.2.4
may be reasonably even, not necessarily random, but asynchronous
with modulation frequency and with DME interrogations.
Frequency Variations - The received signal
3.4.2.5
frequency may vary from the nominal RF channel. frequency by .0087
percent.
Antenna Rotation Frequency - Performance shall
3.4.2.6
Hz 0.8%. This
be maintained for rotation frequencies of 15
tolerance shall also apply for the ninth harmonic thereof.
Frequency Characteristics - The equipment shall
3.4.3
transmit and receive radio frequency signals on frequencies as
specified in MIL-STD-291.
Pulse Repetition Rate - When the equipment is
3.4.4
interrogating a beacon or ano ther aircraft, the maximum pulse
repetition rate shall be 150 pulse pairs per second (pp/s) in the
search mode and 30 pp/s in the track mode. In the AIR-TO-AIR mode
the minimum track interrogation rate shall he 22 pp/s. The pulse
repetition rate shall vary or jitter enough to preclude
synchronization of transmitted pulses among any of 100 equipments
on the same channel for more than 1 second in 1 hour. A search
repetition rate of 135 pp/s shall be avoided to preclude
synchronization with the fine bearing information.
13.
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