TB9100/P25 CG/P25 TAG Installation and Operation Manual Installation 71
© Tait Limited March 2014
Connecting a 1PPS Source
A 1PPS signal is required for simulcast base stations. Use a 50Ω coaxial cable
(RG58 or RG223) to connect the source to the base station’s 1PPS input.
You can daisy-chain up to six base stations using T-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
with a 50Ω resistor, otherwise reflections of the 1PPS pulse may occur.
Figure 3.13 Daisy-chaining an external frequency reference input
50Ω termination
maximum of eight base
station loads on one
frequency reference output
maximum overall cable
length is 30m
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