Digital Power Amplifier Operator Manual
Doc : DPA3-ASUM-7xxx
General Information
Issue : 1 (03/08/2015) Page 1
Copyright © 2015 Vislink International Ltd
1. General Information
1.1. Health & Safety
The information that follows, together with local site regulations, must be
studied by personnel concerned with the operation or maintenance of the
equipment, to ensure awareness of potential hazards.
WARNING – RF Power Hazard: High levels of RF power are present in the unit.
Exposure to RF or microwave power can cause burns and may be harmful to health.
WARNING – GaAs/BeO Hazard: Certain components inside the equipment contain
Gallium Arsenide and Beryllium Oxide which are toxic substances. Whilst safe to
handle under normal circumstances, individual components must not be cut, broken
apart, incinerated or chemically processed. In the case of Beryllium Oxide, a white
ceramic material, the principal hazard is from the dust or fumes which are carcinogenic
if ingested, inhaled or entering damaged skin.
Please consult your local authority before disposing of these components.
CAUTION – Tantalum Capacitors: When subjected to reverse or excess forward
voltage, ripple current or temperature these components may rupture and could
potentially cause personal injury.
CAUTION: This system contains MOS devices. Electro-Static Discharge (ESD)
precautions should be employed to prevent accidental damage.
1.2. Environmental Operating Conditions
1.2.1. EXPOSURE TO NON IONISING (RF) RADIATION/SAFE WORKING
DISTANCES
The safe working distance from a transmitting antenna may be calculated from the
relationship:
D =
In which: D = safe working distance (metres)
PT = transmitter or combiner power output (Watts)
GR = antenna gain ratio = anti log (gain dBi 10)
w = power density (Watts/square metre)
The RF power density value is determined by reference to safety guidelines for
exposure of the human body to non-ionising radiation. It is important to note that the
guidelines adopted differ throughout the world and are from time-to-time re-issued with
revised guidelines. For Gigawave use, a maximum power density limit of 1W/m² is to
be applied when calculating minimum safe working distances.
Important Note: It must be remembered that any transmitting equipment radiating
power at frequencies of 100kHz and higher, has the potential to produce thermal and
athermal effects upon the human body.
PT. GR
