TB9300 Installation and Operation Manual Installation 85
© Tait International Limited April 2024
4.6.7 Connecting a 1PPS Source
A 1PPS signal is required for simulcast base stations. Use a 50coaxial
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 BNC goal post
adaptors (see Figure 4.12). 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 50 resistor, otherwise
reflections of the 1PPS pulse may occur.
Notice If 1PPS is used then 1PPS and NTP must both be derived
from the same time base. Normally this will be a GPS disciplined
source.
Figure 4.13 Daisy-chaining a 1PPS input
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 termination
(also needed for
single base stations)
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