TM8000 3DK Hardware Developer’s Kit Application Manual Connector Power Supply Options 131September 2003 © Tait Electronics Ltd8 Connector Power Supply OptionsPower from the radios primary power source is fed to the auxiliary, internaloptions, control-head and microphone connectors. Whether power to theseconnectors is unswitched, switched or not supplied is determined byhardware links LK5 and LK6 as shown in Figure 8.1 and Table 8.1.Unswitched Power Unswitched power means that power will always be supplied to theconnector while the primary power source is connected to the radio and isalive. The supply to the connector is not affected by the state of the radio.Switched Power Switched power means that when the radio is off or in standby mode, thepower to the connector is switched off. The power will also be switched offif the primary power source voltage is outside the radio’s operating range(for details refer to “Power Connector” on page 18). The switched currentdrawn by all connectors must not exceed 1A in total.Note The switched output is protected. Short-circuiting the switchedpower on any connector will not damage the radio. In the eventof a short circuit, the current folds back to protect the switchdevice and connectors.Figure 8.1 Connector power distributioninternal optionsconnectorpowerconnector LK6LK5control-headconnectorprimarypowersource+13V8_BATTmicrophoneconnector+13V8auxiliaryconnectorLK8(R786)LK7(R787)
