The DUP50 device allows to connect your HF and VHF antenna to the same antenna port on IC-705 or other HF/VHF/UHF transceiver providing no more than 50W of power output.
It’s called Duplexer on the label, but I think it is a Diplexer. But why is this important, as long as the device does its job? You should know the difference before buying one!
Link to the Takamatsu Olive Ham Club site:
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