Motorola BT100 - Manual (Page 21)

2-10 Overview
BT100 Installation and Operation Manual
Accurate −20 dB directional coupler test points are available at the input and at the outputs of
the amplifier. Because these test points are 75-ohm source impedance, they do not require
special test probes.
After the output amplifier, a second directional coupler provides signal to the optional ADU
board. As this signal is used only with the ADU, you do not need to terminate this port when
the ADU is not installed.
Figure 2-10 illustrates the interconnection between these components in the four output
BT100*-4*.
Figure 2-10
BT100*-4* four output block diagram