This design passes the lower desired transmittedsignal to the antenna port using a low-pass filter, and sends the higher frequency by-products via a high-pass filter into a termination. Well known design by W0IYH made by UA3QLC.
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 output ports, so no additional ant-switch is needed. Outputs can be connected in parallel for multiband antenna (say 10-15-20 meters tribander)
The cores are T106 and T50 by Micrometals, relays are 16 Amps TRA2 12 VDC, capacitors are MuRata GRM42A SMD high voltage 3.15 KV and several mica units on 160 meters HPF, connected in parallel to meet the hi-power requirements. The load is 24pcs 1.2 K 2W each resistors. FR4 double-sided PCB size 230x170 mm.
The filters are carefully tuned on each band to get the SWR as low as 1.2:1 .
ATTENTION!!!!
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If you want a more rapid method of delivery, then you should choose the EMS.