User's Manual
VHF UNIDIRECTIONAL AMPLIFIER TECHNICAL MANUAL
6
Power supplies and Alarms
The UDA can be fed with AC or DC power, via AC Input or DC Input ports, selected by mean of an
AC/DC sliding switch.
The AC power source could be 50 or 60Hz, with a voltage ranging from 100V min. to 260V max.
The DC supplies of +48Volt/1.5A (+52Volt max) and +6Volt/2A (+12Volt max) should be provided
via pins #1, #2 and #6 of the DC Input (D-sub 9 pins connector).
Power fails on the VGA and the PA can be detected via the states of NO1/COM1/NC1 and
NO2/COM2/NC2, respectively. Their normal state indicates that there is no DC voltage detected on
the relays coil, hence a fail of the power supply.
Pin 1: +48Volts Pin 2: +6Volt Pin 6: GND
Pins 3/4/5: NO1/COM1/NC1 Pins 7/8/9: NO2/COM2/NC2
Figure 2: DC input pins and Alarm pins on the D-Sub connector