Shure PA421B User Manual page 6

Using Multiple Transmitters with a Single Antenna
1. Attach an antenna to the MAIN OUT connector of the combiner.
2. Use the supplied BNC-BNC cables to connect the antenna
ports of the IEM transmitters to the RF INPUTS of the antenna
combiner.
3. Use the power cables to route power from the combiner
POWER OUTPUTS to the DC inputs on each compatible IEM
transmitter, if applicable.
Note: Use external power supplies or an optional power
distribution cable to supply power to additional transmitters. The
PA821B and PA821BX combiners do not supply DC power.
Using Multiple Antenna Combiners with a Single Antenna
Use the passive expansion port to share a single antenna with multiple combiners or transmitters.
combiner 1
P A8 21A
PS M Antenna Combiner
470-865 MHz
A IN
INPUT SIGNAL
INPUT SIGNAL
MAIN OUT - 50 OHMS
①
P A821B
PSM Antenna Combiner
470-865 MHz
INPUT SIGNAL
INPUT SIGNAL
MAIN OUT - 50 OHMS
B IN A+B OUT
POWER
EXPANSION PORT
② ③
A IN B IN A+B OUT
POWER
EXPANSION PORT
combiner 2
®
PA421B
PSM Antenna Combiner
470-865 MHz
INPUT SIGNAL
DC OUTPUT
MAIN OUT - 50 OHMS
ALL DC CONNECTORS USER CLASS 2 WIRING
Four PSM900 transmitters using a single antenna.
1. Use a BNC-BNC jumper cable to connect the combiner 1
MAIN Output to the A IN of the combiner 1 expansion port.
2. Connect the antenna output from an IEM transmitter or the main
output of another combiner (combiner 2) to the B IN of the expansion
port on combiner 1.
3. Connect the antenna to the A + B OUT of the combiner 1 expansion
port.
A IN
6
A IN B IN
EXPANSION PORT
625
B IN
EXPANSION PORT
A+B OUT
POWER
A+B OUT