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TB9400 Installation and Operation Manual

© Tait Limited March 2015

A 1PPS signal is required for simulcast and P25 Phase 2 base stations. Use 
a 50

Ω coaxial cable (RG58 or RG223) to connect the source to the base 

station’s 1PPS input. You can daisy-chain up to eight base stations using 
F-junctions. We recommend that the cable length between the first and last 
load is kept to a minimum. This will reduce any propagation variation 
between base stations. The maximum overall cable length is 30m. 
Terminate the last connection (including single base stations) with a 50

Ω 

resistor, otherwise reflections of the 1PPS pulse may occur. 

Notice For P25 Phase 2 operation the NTP signal must be linked to 
the 1PPS signal. To ensure synchronization, both signals must come 
from the same GPS source.

The RJ-45 socket on the reciter’s rear panel provides the 10BASE-T or 
100BASE-T Ethernet connection to the other devices in the network. Use 
Cat-5 cable to connect this socket to the Tait P25 Network via a router or 
switch. 

If necessary, refer to 

 for a list of 

Ethernet connection pin allocations.

The longest length of cable must be between 

the source and the first base station

use short lengths of cable 

between each base station

maximum of eight base station 

loads on one 1PPS output

50

Ω termination

(also needed for

single base stations)