TETRA Antenna Combiner
Radio Systems Information Ltd.
Page 5
The combiner also includes a RECEIVE ONLY port with 0dB loss to the antenna. This is suitable
for connecting to a measuring / monitoring receiver or similar and MUST NOT be attached to a
TETRA terminal.
The following diagram shows how the TETRA Antenna Combiner is connected:
When using class 3 (3W) radio terminals, the combiner will simulate the following:
Port 1
Port 2
Port 3
Port 4
Model A
(5dB switches ‘in’
for ports 3 & 4)
Class 3 Vehicle
Radio
Class 3 Vehicle
Radio
Class 4
Handportable
Radio
Class 4
Handportable
Radio
Model B
(5dB switches ‘in’
for all ports)
Class 4
Handportable
Radio
Class 4
Handportable
Radio
Class 4
Handportable
Radio
Class 4
Handportable
Radio
External attenuators may be added between the radio terminal and the combiner to simulate
building attenuation.
TETRA radio terminals
Measuring / monitoring receiver
Antenna
12V DC Power
Combiner Configuration
