This is just for Reference. It will not be supported in the future and was replaced by 5-Band RF Board and 8-Band RF-Board.
This Board shared 3 parallel-resonance Class E Circuits with 5-Pole Low Pass Filters, to cover 80m-20m. This was the first Board that had Relays on it to switch Bands.
The Old Multiband RF PCB was covered in this manual: