Fitting the roof tiles

HF Low Pass Filter construction

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.