Figure 11-1: Duplexer Installation – UHF Version Shown
Chapter 12: Battery Backup/External DC In
OVERVIEW
The CS-540 can be battery backed-up by connecting a 12 Volt deep cycle battery to the battery
backup/Ext DC In terminals. If the AC Line fails, the internal relay will switch to where the battery
can power the unit. When AC power is restored, the internal relay takes the battery out of the
circuit and switches to the internal power supply. For convenience, the CS-540 provides a
maintenance charge to keep the battery at its optimum level. The internal charging circuit can
comfortably provide a charge current up to 1.3 Amps to the battery. As the battery reaches full
charge, the charging circuit provides a maintenance charge of around 200 mA. For virtually
maintenance free operation, it is recommended that a GEL CELL type deep cycle battery be used.
If it is desired for the CS-540 to be powered from a vehicle or an external 12-13.8V supply, this
can be done by connecting the external source to the CS-540’s Battery/Ext DC terminals. When
the CS-540 is being powered by an external source other than a battery, DO NOT turn on the
internal power supply. If an external power supply other than a battery is connected and the
internal supply is turned on, the internal supply will attempt to ‘charge’ the external supply, which
could damage the external supply. The internal blocking diode protects the internal power supply
from receiving any unwanted voltages or currents from the external supply or battery.
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