Duplexer

4 x Sinclair FP20110 Modified to Series Loop

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GB3IN Duplexer

The series loop method was chosen for its much simpler adjustment also a Ferrite Isolator on the transmitter as this site has many transmitters.

Update 2005: Replacing Series Loops with Silver plated tube rather than copper strip has increased notch depth allowing the use of 4 cavities.

 

 

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