Today I also assembled the 6×2 switch with 7/16″ connectors. I am gonna test this one and publish the results of insertion loss and isolation between the radio ports. If I am happy with the result I will go on and build one more box to “complete” my antenna switch system at SJ2W.
The copper plates between the relays are to decrease the coupling between the relays. I have not done much measurements on this except that I noted that I got a few more dB attenuation between radio A and B when I did measurements a long time ago, on my standard 6×2 design for SO239 or N. These boards will be possible to buy, also the regular 6×2 boards are sold if there is interest.
The reason that I have cables between the radio input ports and the board is because there need to be compensation for the capacitance in the board and this is done by adding an inductance in series with the input. I have successfully done this with the old boards. I will though measure and see if a straight wire is enough inductance or if I need to have a turn or two (air wound coil).
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