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Duplexer
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141 Basics of Duplexers for radio repeaters; function, alignments and tests - YouTube
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DUPLEXERS - An Introductory Tutorial
DUPLEXERS - An Introductory Tutorial
Duplexer - Wikipedia
20W UHF Duplexer 400Mhz-470Mhz UHF Repeater Duplexer BNC Interface for Service Radio Stations
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