Tait TEL0061 Paging Transmitter User Manual T857 T859 Install A3 pages pd

Tait Limited Paging Transmitter T857 T859 Install A3 pages pd

PowerAmpInstall

M850-00T858/859 InstallationF3.1Copyright TEL 31/01/993 T858/859 Installation3.1 Rack MountingCaution:If you require continuous operation of the T858, leave the rack moduleposition immediately adjacent to the finned heatsink empty. Thereshould be adequate airflow over the fins at all times. Extra airflow canbe provided by fitting an auxiliary fan kit such as the T800-19-0010(refer to the T800 Ancillary Equipment Service Manual or your nearestTait Dealer or Customer Service Organisation for more details).The T858 and T859 PAs are designedfor use in a standard 483mm rack frameusing Tait T800 Series II guide rails.The guide rails are securely mounted tothe rack frame with front and rearretaining screws, and the PA is securedinto the guide with two (T858) or four(T859) front panel mounting screws.Figure 3.1 shows the standard, doublewidth guide designed for use with theT859, while Figure 3.3 shows how thePA can be latched in the extended posi-tion. For more information on availa-ble guide kits, refer to the T800Ancillary Equipment Service Manualor your nearest Tait Dealer or CustomerService Organisation. Figure 3.1 T800-45-0001 PA Guide KitThe PA rear panel has three connectors: a BNC for RF input (from an adjacent T857exciter), an N-type for RF output and a D-range for all DC, audio and control connec-tions (refer to Figure 3.2).Figure 3.2 T858/859 Chassis ConnectorsFigure 3.3 T858/859 PA In Latched PositionNote:You will need appropriate extension leads if you wish to carry out anyadjustment procedures with the PA withdrawn from the rack in the latchedposition. Alternatively, disconnect and withdraw the PA and reconnect itbehind the rack.3.2 Rack WiringThe D-range input and output connections are shown in Figure 3.4. Ensure that thecables are not subjected to any stresses due to tight bends or incorrect lengths.Make sure the RF coax cables to the N-type and BNC connectors are free from sharpbends or twists. If access to the rear of the rack frame is restricted, the cables should belong enough to allow the chassis to be fully withdrawn from the guide.Figure 3.4 T858/859 D-Range Wiring - Rear ViewFront PanelMounting HolesRack MountingHolesRack MountingHolesRack Mounting HolesN-Type ConnectorBNC ConnectorD-Range ConnectorN-Type ConnectorBNC ConnectorD-Range ConnectorT858T859RF OutputRF InputD-rangeTop RailBottom Rail123456789101112131415Normally low, floaton alarm conditions.500mA sink capability.Pull low to enablealarm outputsPower supply, -ve earthWill drive a coil meter10.8 to 16V DCReverse Power MeteringForward Power MeteringReverse Power AlarmForward Power AlarmTx Key +13.8VGnd
F3.2T858/859 InstallationM850-0029/02/00 Copyright TEL3.3 Power SupplyIf a power supply other than an appropriate Tait model is used, ensure that it is capableof providing enough current to drive the T800 system and is also free from excessiveripple or noise.The system should be protected by the use of appropriately rated fuses in the powersupply.Note:It is particularly important when the prime power source is a battery thatfuses be employed in all supply lines.Caution:Connect the power supply directly to the PA, and not via connectorblocks. This will avoid overheating of connector blocks that are not ofthe correct current rating.3.4 Reverse Polarity & Overvoltage ProtectionA crowbar diode is fitted to all T858/859 PAs for protection against connection to apower supply of incorrect polarity. It also provides overvoltage protection from voltagetransients caused by lightning strikes.Note:A fuse must be fitted in the power supply line for the diode to provide effec-tive protection.

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