Replaced the #Kathrein duplex filter in my modded #Siemens C5 with a PCB designed by #DL8SDL in 2001. I found his schematic, ported it to a modern PCB stackup and updated some components.
RX/TX isolation > 30 dB, PA/Ant < 0.7 dB loss😊
#amateurradio #diy #cnetz #microstrip
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