User's Manual

100 Connection TB8100 Installation and Operation Manual

Important In base station systems which use a PMU, the PMU must

be connected to the system control bus at all times. The

C current source is located in the PMU, and if the PMU

is disconnected, the state of much of the bus will be unde-

fined. This may cause corrupted data to be present on the

bus when the reciter reads the states of the switches on the

control panel. This in turn may result in random actuations

of microphone PTT, carrier, or speaker key, causing the

BSS to transmit or the speaker to be actuated incorrectly.

Figure 7.1 Dual 5W or 50W base station inputs and outputs - front view

28VDC high current output for PA

28VDC high current input cable from PMU

28VDC low current output for reciter

RF output to PA

system control bus

28VDC low current input from PMU

RF input from reciter

DC output (for optional reciter fan only)

bcd e ghfgh

ddidiefd

PA 1 PA 2 reciter 2PMU

reciter 1