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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.
Duplexers : Technical Reference/Duplexers Duplexers and diplexers
A low cost UHF/VHF duplexer is listed on dxzone.com since 2008-11-21
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The scale is 1 - 10, with 1 being poor and 10 being excellent.
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