Tait TB9300 Installation And Operation Manual

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Tait TB9300 Installation And Operation Manual Manual pdf 86 page image

86 Installation TB9300 Installation and Operation Manual© Tait Limited March 20165.5 Installing the Base Station on Site5.5.1 Base Stations for Trunked SystemsWhen installing base stations that are part of a trunked system, it is veryimportant to observe good site engineering rules. This is especially truewhen the channels are combined into a single antenna.If at all possible, the RF planner should avoid frequency plans in which theRx to Tx spacing is an exact multiple of the trunked channel spacing, thusforcing Tx intermodulation products to fall outside the Rx channels.Cables and antennas should be of high quality construction. Solid shieldheliax type cables are best, but if braided shield cables must be used forshort distances, their braids must be silver-plated. Isolators should be usedat all transmitter outputs.When the outputs of more than one transmitter are combined, their voltagesadd, and the resulting peak envelope power is not simply the sum of theirpowers, but is equal to the power of one of them multiplied by the squareof the number of sources. Cables, components, and hardware must be ratedto withstand the peak envelope power.During the commissioning process, all transmitters should be activatedtogether using a diagnostic test tone, while the receiver RSSI is monitored.There should be no perceptible increase in RSSI while the transmitters areactive.5.5.2 Equipment RequiredIt is beyond the scope of this manual to list every piece of equipment thatan installation technician should carry. However, the following tools arespecifically required for installing the base station:■ Pozidriv PZ3 screwdriver for the M6 screws used in the DC inputterminals on the PMU; M6 (0.25in) screws are also used to secure thesubrack to the cabinet in factory-assembled systems■ Pozidriv PZ2 screwdriver for the M4 screws used to secure the moduleretaining clamps, and for the fasteners used to secure the front panel tothe subrack■ 8mm AF spanner for the SMA connectors, and the subrack groundconnector.You can also obtain the TBA0ST2 tool kit from your regional Tait office.It contains the basic tools needed to install, tune, and service the basestation.