MIL-STD-291C
1025 MHz, shall receive at 1088 MHz and pair with channel 64X or 64Y transmitting at 1088
MHz and receiving at 1025 MHz. Channel 2X or 2Y, transmitting at 1026 MHz, shall receive at
1089 MHz and pair with channel 65X or 65Y transmitting at 1089 MHz and receiving at 1026
MHz.
5.17 A/A system delay time. The single reply pulse shall occur 62 µsec ± 0.1 µsec in
X-mode and 74 µsec 0.1 µsec in Y-mode after receipt of the first pulse of an interrogation pair of pulses. The range indicator of the interrogator shall read 0 miles upon receipt of a reply pulse at the antenna 62 µsec after transmission of the first pulse of an interrogation pair of pulses in
X-mode and 74 µsec in Y-mode.
5.18 Signal characteristics. The interrogation pulse pairs shall have characteristics identical with those in air-to-group operation. For X-mode A/A operation the pulse pair spacing shall be
12 ± 0.1 µsec and for Y-mode A/A operation the pulse pair spacing shall be 24 ± 0.1 µsec. Each airborne equipment shall transpond to each received interrogation from other airborne equipment with a single pulse having the same characteristics as the interrogation pulses.
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful, but is not mandatory).
6.1 Intended use. The TACAN signal characteristics tolerances defined herein are intended for use by all airborne and ground equipments. The air navigation signal characteristics covered by this standard are military unique because they are used with military applications only in air- to-air operation.
6.2 International standardization agreements. Certain provisions of this standard are the subject of international standardization agreement (NATO C-13). When amendment, revision, or cancellation of this specification is proposed which will affect or violate the international agreement concerned, the preparing activity will take appropriate reconciliation action through international standardization channels, including departmental standardization offices, if required.
6.3 Cross reference. This interface standard replaces MIL-STD-291B.
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