4-SQ PCB SO239/N

Description

The 4-SQ PCB is designed to be used with hybrid couplers similar to the COMTEK boxes. This requires a bit more skills than building the other antenna switches, since to get the best functionality the box requires some tuning. It is pretty well described on TK5EP website and also in the ON4UN book.

The 4-SQ PCB as all other switches has got at least 105 um copper thickness and handles OM-3500 power levels without any problem.

Note that I labeled the antenna ports different from TK5EP. The control cable is identical but on my board,

TK5EP 4-SQ description

Bill Of Materials

List compiled by G4AON if ordering from rapid (note it’s for the 6×1 but most parts match)

4-SQ schematic – Note that the 800pF capacitor value is different depending on which band it’s built for

Top view of the board – If used as a drilling template, make sure to print it as 1:1 scale.