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|  MIL-N-81207A(AS)
signal. In the absence of a desired signal, the undesired signal
shall be considered rejected if no distance, bearing or identity
tone information is obtained.
Co-Channel - The equipment shall be capable of
3.4.14.2
rejecting the weaker of two beacon signals received on the same
channel when the difference in the signal strength is 8 dB or
more. The performance obtained from the stronger signal shall
meet all requirements of this specification except that an
additional one degree bearing error is permitted when only 8 dB of
difference exists between the two signals. The 8 dB of difference.
shall be measured using test signals, each having the same
modulation indexes, but not exceeding a total of 40% modulation.
Operational Range - The operational range of
3.4.15
the equipment shall be at least 300 3 nautical miles. The
equipment shall be required to perform all functions specified
herein with the prescribed accuracies while operating in its
respective modes within the operational range.
Pulse Code Discrimination - The sensitivity of
3.4.16
the receiver shall not decrease more than 3 dB when receiving a
pulse pair spaced 0.5 microsecond from nominal, and loss of
receiver sensitivity shall be at least 70 dB for a pulse pair
spacing of at least 4.0 microseconds from nominal.
Channel Selection Time - The time to switch
3.4.17
from full sensitivity and power output on one channel to full
sensitivity and power output on any other channel shall not exceed
one second, under manual control.
Normal TACAN System Delay - The equipment shall
3.4.18
effect an indication of 0 0.05 nautical mile in the T/R mode
when:
(a) The delay at the 50% leading edge
amplitude point of the first RF interrogation
pulse and the first reply pulse in a coded
pair, is 50 0.1 microseconds for X mode
operation and 56* 0.1 microseconds for Y mode
operation. (*With provisions for 74 us.)
(b) The delay is measured at the antenna input
terminal.
Direction of Search
3.4.19
20.
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