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Yes, U.S. RC-135s Have Used Bogus Hex Codes To Transmit A False Identity. But It's Not To Fool China Or Other Enemies. - The Aviationist
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The Q Code
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Imperial Iranian Army Aviation AH-1 Cobra diecast Code 3 Attack Helicopter Iran | eBay
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Aircraft Transponder
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Technique: What's the frequency? - AOPA
Aviation Radio Navigation
