SDI DA-1G, Operating Manual, Page: 5 / 15

1.0 Introduction
Page 1
The DA-1G is a general-purpose isolation amplifier designed to distribute frequencies from
700 MHz to 1100 MHz. The input signal is distributed to twelve output channels.
The DA-1G offers 80 dB of channel-to-channel isolation and 85 dB of reverse isolation at a
frequency of 1 GHz. The low phase-noise ensures that the distributed signals are not
degraded. The outputs have a low VSWR, typically 1.2, to minimize environmental effects
on frequency distribution through long transmission lines.
The instrument is equipped with a power level monitor that compares the twelve output
power levels to a preset threshold of +7 dBm. If the signal on any output drops below this
threshold, the monitor LED located on the front panel will turn off indicating a fault
condition. The inputs and outputs are chassis grounded.
The DA-1G is designed to be powered by a 100 to 240 VAC mains source or by a +12 to
+36 VDC for instruments acquired with the DC power option. If both AC and DC sources
are powering the instrument, the DC source will be used as backup power in case of AC
power outages. The instrument is designed to automatically switch from AC to DC supply
operation using a Schottky diode network and charge storage capacitors to avoid any
glitches and ensure uninterrupted continuous operation.