Duplexers for dual band radio are usually high pass filter and low pass filter combined in the same box. This circuit is a design within a cost of US$10.
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A low cost UHF/VHF duplexer
Fetched: November 21st, 2008, 3:44am EST by The DXZone.com
Technical Reference/Duplexers
Duplexers for dual band radio are usually high pass filter and low pass filter combined in the same box. This circuit is a design within a cost of US$10.