User's Manual - Crown Broadcast

2.1 Operating EnvironmentYou can install the FM transmitter in a standard component rack or on a suitable surfacesuch as a bench or desk. In any case, the area should be as clean and well ventilated aspossible. Always allow for at least 2 cm of clearance under the unit for ventilation. If you setthe transmitter on a flat surface, install spacers on the bottom cover plate. If you install thetransmitter in a rack, provide adequate clearance above and below. Do not locate the transmitterdirectly above a hot piece of equipment.2.2 Power ConnectionsThe FM30, FM150, and FM300 operate on 100, 120, 220, or 240 volts AC (50 or 60 Hz; singlephase). Each transmitter can operate on DC power as well (28 volts for the FM30, 48volts for the FM150, and 72 volts for the FM300). The transmitter can operate on fewer voltsDC, but with reduced RF output power (see section 1.3). In addition, the transmitter isolatesthe AC and DC sources; both can be connected at the same time to provide battery backupin the event of an AC power failure.2.2.1 AC Line Voltage SettingTo change the voltage setting, follow these steps:1. Disconnect the power cord if it is attached.2. Open the cover of the power connector assembly using a small, flat blade screwdriver. See Illustration 2–1.3. Insert the screwdriver into the voltage selection slot and remove the drum from the assembly.4. Rotate the drum to select the desired voltage. See Illustration 2–2.5. Replace the drum and cover and check to see that the correct voltage appears in theconnector window.6. Connect the AC power cord.2-2 FM30/FM150/FM300 User’s Manual