User's Manual

Table Of Contents

TB9400 Installation and Operation Manual Description 17

1.4 Frequency Bands and Sub-bands

Much of the circuitry in the base station is common to all frequency bands,

and is therefore covered by a single description in this manual. In some

cases the descriptions refer to specific bands or sub-bands, and these are

identified with the letters listed in the following table.

1.5 Applications

The TB9400 is designed for operation in a Tait P25 trunked radio network.

It can operate as a single base station or as part of a simulcast channel

group, and as a traffic channel or control channel.

In a trunked simulcast network, the transmitters in the channel group are

synchronized and transmit simultaneously on the same frequency. Each

transmitter needs a highly accurate 1PPS pulse and an external frequency

reference, so that it can time transmissions with the required accuracy. We

also recommend using an NTP server at each site, as this will ensure a

common timestamp in logs across all units in the system.

The base station can be provided as a receive-only variant in systems that

need sites to enhance the receive coverage. The reciter in a receive-only

base station is physically unable to transmit.

For more information, refer to the appropriate Tait P25 System Manual.

Frequency Identification Frequency Band and Sub-band

B band B3 = 148MHz to 174MHz

H band H1 = 400MHz to 440MHz

H2 = 440MHz to 480MHz

K band K4 = 762MHz to 870MHz

a. The actual frequency coverage in this band is:

Transmit: 762MHz to 776MHz, and 850MHz to 870MHz

Receive: 792MHz to 824MHz