Tait TB7300 Installation And Operation Manual

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Tait TB7300 Installation And Operation Manual Manual pdf 60 page image

60 Installation TB7300 Installation and Operation Manual© Tait Limited November 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 tool that an installationtechnician should carry. However, the following tools are specificallyrequired for installing the base station:■ Philips #2 tip screwdriver used to connect the DC power cables to theDC power terminals■ Pozidriv PZ3 screwdriver for the M6 screws used to secure the tray tothe cabinet in Tait factory-assembled systems■ 8mm spanner for the M5 nut on the ground connector.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.