18 November 1996
Multiplexer Module (TX2A/TX4A)
MUX-7
1
8
1
J3
2
1
J7
J4
J5
J6
J2
J1
Connector for Power Supply and
for channel select signals
V_
IN
GN
D
CS
A
CS
B
Connection to
RF Module
antenna terminals
TX/RX
antenna 4
TX/RX
antenna 1
TX/RX
antenna 2
TX/RX
antenna 3
Figure 1: Top View
The Multiplexer switches the selected antenna to the RF Module. The Multiplexer switches both
the transmit and receive functions of the antenna. Low resistance high voltage switches
(MOSFETs) are used to switch the antenna connection because of the high voltage used during
transmitting.
ANT
GNDTX
Figure 2: Block Diagram
