I've started building a LPF diplexer filter rated for a 1KW SSB/CW HF transistor power amplifier
The diplexer consists of 6 relay-switched units and covers 1.8 to 30 MHz amateur radio bands. It has 1 input port and 6 antenna outputs, so no additional ant-switch is needed.
Next comes the hard part - winding the toroidal ferrite cores, and tuning them for each band.
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