MIL-STD-291C
CONTENTS
PARAGRAPH PAGE
FOREWORD .......................................................................................................ii
1. SCOPE .................................................................................................................1
1.1 Scope..............................................................................................................1
2. APPLICABLE DOCUMENTS (Not applicable)
3. DEFINITIONS (Not applicable)
4. GENERAL REQUIREMENT .............................................................................1
4.1 TACAN channels...........................................................................................1
4.1.1 Number of channels .......................................................................................1
4.1.1.1 Interrogating frequency..................................................................................1
4.1.1.2 Ground reply frequency .................................................................................1
5. DETAILED REQUIREMENTS..........................................................................2
5.1 TACAN surface transponder signal...............................................................2
5.1.1 Radio frequency (r.f)......................................................................................2
5.1.2 R.F. pulse spectrum........................................................................................2
5.1.3 Continuous wave (cw) output ........................................................................2
5.2 Pulse shape.....................................................................................................2
5.2.1 Pulse top.........................................................................................................2
5.2.2 Pulse rise time................................................................................................2
5.2.3 Pulse fall time ................................................................................................2
5.2.4 Pulse duration ................................................................................................2
5.3 Pulse droop ....................................................................................................2
5.4 Pulse coding...................................................................................................3
5.5 Main reference pulse group ...........................................................................3
5.6 Auxiliary reference pulse group ....................................................................3
5.7 Precedence .....................................................................................................3
5.8 Identification signal .......................................................................................3
5.8.1 Equalizing pulse pair .....................................................................................3
5.8.2 Identity cycle..................................................................................................3
5.9 Pulse repetition rate .......................................................................................4
5.10 Dead time.......................................................................................................4
5.11 Composite 15 and 135 Hz variable bearing signal ........................................4
5.11.1 Harmonic content...........................................................................................5
5.12 Distance reply signal......................................................................................5
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