Tait TM8260 Installation And Programming Manual

Also see for TM8260: Operator's manual Operator's manual User guide Getting started guide

Tait TM8260 Installation And Programming Manual Manual pdf 27 page image

TM8260 Installation and Programming Guide Installing a Dual-Radio System 27© Tait Limited October 20143.6 Connecting the Power Cables to a Power SourceTo provide power to dual radio systems, you must connect each radio bodyseparately to a power source or sources. Dual radio systems do not currentlysupport a single lead-to-battery connection.It is important to ensure that both radio bodies have a solid and secure powersupply. Unexpected behavior can arise if the power supply to one bodyoperates at a lower voltage than the other, or is momentarily interrupted, asmight occur with a poorly formed or intermittent wiring termination.Notice Each radio is designed to operate from a nominal 12V negativeground supply. Each radio may draw up to 15A of current. Each radiowill tolerate a supply voltage range of 10.8V to 16.0V at the radio.Selecting the PowerSource In passenger vehicles, the radio is always connected directly to the batteryusing the power cable provided.Notice Do not connect the radio to the center tap of two 12V batter-ies! This may result in damage to the radio due to earth loops, in partic-ular when the negative lead is disconnected from the vehicle battery.It may also result in overcharging or undercharging of the batteries,reducing their service life.In trucks, where direct connection to the battery is often not possible, eachradio can be connected to a suitable terminal inside the fuse box that isconnected directly to the battery.24V-to-12VConverter In vehicles with a supply voltage larger than 16.0V, such as many trucks, itis essential to provide a suitably rated 24V-to-12V converter. This willisolate the radios from excessive battery voltage and provide the correct DCoperating conditions. Note that most 24V-to-12V converters already fittedare not rated sufficiently.Table 3.3 Radio body power connector—pins and signalsPinout Pin Signal name Description Signal type1 AGND Earth return for radio body powersourceGround2 SPK– External speaker output. Balanced loadconfigurationAnalog3 SPK+ External speaker output. Balanced loadconfigurationAnalog4 13V8 BATT DC power input for radio body andcontrol headPowerrear view>25W radio1 2 3 4rear view25W radio