Crown Low Power Transmitters - Crown Broadcast
Crown Low Power Transmitters - Crown Broadcast
Crown Low Power Transmitters - Crown Broadcast
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
CAUTION<br />
Possible equipment damage!<br />
Before operating the transmitter for<br />
the first time, check for the proper AC<br />
line voltage setting and frequency<br />
selection as described in sections 2.2<br />
and 2.3.<br />
2.1 Operating Environment<br />
You can install the FM transmitter in a standard component rack or on a suitable<br />
surface such as a bench or desk. In any case, the area should be as clean and wellventilated<br />
as possible. Always allow for at least 2 cm of clearance under the unit for<br />
ventilation. If you set the transmitter on a flat surface, install spacers on the<br />
bottom cover plate. If you install the transmitter in a rack, provide adequate<br />
clearance above and below. Do not locate the transmitter directly above a hot piece<br />
of equipment.<br />
2.2 <strong>Power</strong> Connections<br />
The FM30, FM100, and FM250 operate on 100, 120, 220, or 240 volts AC (50 or 60<br />
Hz; single phase). Each transmitter can operate on DC power as well (28 volts for<br />
the FM30, 36 volts for the FM100, and 62 volts for the FM250). The transmitter<br />
can operate on fewer volts DC, but with reduced RF output power (see section 1.2).<br />
In addition, the transmitter isolates the AC and DC sources; both can be connected<br />
at the same time to provide battery backup in the event of an AC power failure.<br />
2.2.1 AC Line Voltage Setting<br />
To change the voltage setting, follow these steps:<br />
1. Disconnect the power cord if it is attached.<br />
2. Open the cover of the power connector assembly using a small, flat blade<br />
screwdriver. See Illustration 2–1.<br />
3. Insert the screwdriver into the voltage selection slot and remove the drum<br />
from the assembly.<br />
4. Rotate the drum to select the desired voltage. See Illustration 2–2.<br />
5. Replace the drum and cover and check to see that the correct voltage appears<br />
in the connector window.<br />
6. Connect the AC power cord.<br />
2–2 FM30/FM100/FM250 User's Manual