2–2
FM30/FM100/FM250 User's Manual
2.1 Operating Environment
You can install the FM transmitter in a standard component rack or on a suitable
surface such as a bench or desk. In any case, the area should be as clean and well-
ventilated as possible. Always allow for at least 2 cm of clearance under the unit for
ventilation. If you set the transmitter on a flat surface, install spacers on the
bottom cover plate. If you install the transmitter in a rack, provide adequate
clearance above and below. Do not locate the transmitter directly above a hot piece
of equipment.
2.2 Power Connections
The FM30, FM100, and FM250 operate on 100, 120, 220, or 240 volts AC (50 or 60
Hz; single phase). Each transmitter can operate on DC power as well (28 volts for
the FM30, 36 volts for the FM100, and 62 volts for the FM250). The transmitter
can operate on fewer volts DC, but with reduced RF output power (see section 1.2).
In addition, the transmitter isolates the AC and DC sources; both can be connected
at the same time to provide battery backup in the event of an AC power failure.
2.2.1 AC Line Voltage Setting
To 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 the connector window.
6. Connect the AC power cord.
Possible equipment damage!
Before operating the transmitter for
the first time, check for the proper AC
line voltage setting and frequency
selection as described in sections 2.2
and 2.3.
CAUTION
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