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2016
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BASIC DUAL RADIO (SO2R) CONFIGURATION EXAMPLE
Setup requirements
This example configuration shows configuring a system for two radios. The same antenna farm and restrictions
are used as in the initial example. Converting for two radios is very simple with the only change in front of the
Double Ten Switch R ports as shown in the partial schematic below.
SMD's local relay outputs need to be grouped
into two units - port A and port B. Port B will
be used to control Band Pass Filters for each
SMD. To add the second radio requires that
addition of a second SMD, BPF 1, BPF 2, and
PA 2 be added to the list of RF Boxes and the
Interconnections tab as shown on the plan.
SMD will control PA 2 via its local PA port the
same way as SMD1 controls PA 1.
The Security Tab Frequency table will need to
be modified from the simple case; each band
will need to be listed separately because in
SO2R we want to be able to listen on one
radio while transmitting on the other.
“Detach RX antenna on PTT”
is preferred if
“in-band” SO2R operation is desired and it is
possible that the receiving radio will be
connected to an antenna that is not RX safe. If in band operation is not contemplated, “
Prevent TX”
will provide
the classic style of “same band” lockout.
This configuration is the most common used by SO2R operators. However, it lacks the very useful ability to
utilize the second receiver connected to separate antennas for diversity or “in band” split. The next example will
examine how to get both two radio operation and dual receive.
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