Revision 1.5 November 21, 2011
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3.3 Relay Outputs
The
Bandmaster III
Relay connector
(See figure 1 on page 4) is a Female
DB25, where pins 1 through 12 are used
for Outputs A (160M to 6M) and pin 13 is
used as the COMMON for Output A.
The COMMON (Pin 13) for Output A may
connected to ground or any voltage
source you desire. (Sourcing or Sinking)
Pins 14 through 25 are used for Output B
(160M to 6M) The output B switches to
ground when activated. (Sinking)
The pinout of J8 is shown in figure 7. The
connector is shown looking at the rear
panel of the unit.
All of the outputs of the Bandmaster III
are isolated relay contacts, so no diodes
are necessary, for example, to connect
the
control
wire
for
a
tribander
(20,15,10m) to three pins (#7, 9, and 11)
all in parallel. This will select the same
antenna regardless of whether you’re on
20, 15 or 10m.
