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SO2R SO2R stands for Single Operator 2 Radios. Figure 1 shows the circuit diagram of the antenna switch. This whole switch can be bypassed if I want to manually switch to a particular antenna. Apologies if the graphics are a bit large for your screen. Right click and Save As... to a local drive if you wish. The switch unit is shown in a state where radio 1 is on 160m and radio 2 is on 20m. As to whether it is a good idea to have RF going to each relay is probably arguable, but it works for me. It is essential that a band-pass filter is present on each transceiver output, and stubs are used on the higher bands. The connection of the switching unit to the manual and automatic relay switches will follow shortly! Meanwhile, it may be enough to say that one should apply 12v DC to the following lines to select the appropriate band. Also note that it is very important that 12v should only be applied to any one relay in the bank at a time. This is achieved by using a set of 2 x 6 push buttons which only allow 1 depression in each set at a time, and of course, a band decoder relay box.
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