Adding up to 12 antennas into 2 SixPaks

The above requires 2 SixPak (6X2) and two WX0B relay boxes

An easy to perform modification is done on the two controller boards to implement the change. This modification allows the high power RF relay boxes to switch when antennas 7 to 12 are selected, its a simple matter of using steering diodes on the terminal strip to pull in the SPDT WX0B RF relay box for that radio, cutting 1 trace, and adding 6 wires to each board.

This photo shows the first modification step.

1 - Use a high speed drill tool or sharp razor knife cut the trace in the center of the rotary switch pads on the right of this picture, note the orientation of the board. You can see the cut as a whitish spot in this picture.  It cuts the 12V DC supply line to the center of the switch.  It will disable this switch from being used.

2 - Solder the 6 wires to the pads as shown in the picture.  This will enable all 12 lines to be used on this rotary switch, allowing the selection of 12 antennas from the control box with a single rotary switch.

3 - place 6 diodes onto the terminal strip as shown in the next picture and solder them together, notice the strip end orientation.  These are the steering diodes that will develop the control signal to pull in the high power RF relay and change us from the first SixPak which contains the feed lines for antennas 1 - 6, to the second SixPak with antennas 7-12.

 Put the switches back into the front panel of the control box and wire your cables per the block diagram above.

Terminal strips of the control box A10 - A160 of the A Radio go to the first SixPaks A10 - A160 terminals.  The B10 - B160 terminals are wired to the second SixPaks A10 - A 160 terminals.  

The Radio B control box terminal strips A10 - A160 go to the first SixPaks B10 - B160 terminals, and the control box B10 - B160 go to the second SixPaks B10 - B160 terminal strips.

The A radio's steering diodes should have a wire (red) soldered to where the six diodes are joined and a second (black) wire connected to the GND terminal.  These wires are wired to the A Radios RF relay Red and Black wires.  Do the same with the Radio B control box except its now wired to the B radios RF relay.

Wire in a 13.8V DC supply to the +12 V and GND terminals of the control boxes.

Plug in your RF cables to the SixPaks, and the RF high power relays.  The inputs of the RF relay boxes should come from your rig and amp.  Use double shielded cables to prevent RF leakage.  This will maintain the high isolation available to you in the SixPaks.

Plug in your antennas to the ports in the SixPaks make a diagram and mark your controllers with labels.

Test everything with low power, to verify you have made the correct antenna connections, and labeled everything correctly.  You may want to use an antenna SWR meter to verify all antennas are switching correctly before using your rigs.  Or use one rig at a time before you plug in both rigs at the same time.  In other words be careful to test it thoroughly before you use it.