Caution!
Fuses have both voltage and current ratings. Use only 250V rated fuses in this
device. The voltage rating generally is marked on fuses. DO NOT use automotive-type low
voltage fuses in any power line application. For 240-volt operation, 15-ampere fast blow
fuses are required.
Warning:
Never insert the power supply cord into the outlet until you have completed all
installation steps! The last step, after verifying all connections, is connecting the power
supply to the power mains.
Position the amplifier at or near the desired location on your operating desk so you have access to the rear
panel, and connect the rear panel cables. Do not connect the power mains at this time!
Station Ground
Common rumor is that a station equipment ground reduces RFI (radio frequency interference) or improves
signal levels. Generally, changes in RFI or signal quality with the addition or removal of a station ground
indicate an antenna or feedline installation problem. Typical problems causing desktop RFI issues include the
following:
1. lack of suitable baluns
2. improper feedline routing near antennas, or improperly designed antennas
3. antennas too close to the operating position
4. poor equipment cabinet design, such as non-bonded or grounded equipment covers or panels
5. poorly designed low-level audio line shield entrances, such as shields allowed to enter cabinets instead
of grounding at the enclosure entrance
6. improper antenna feedline building entrance, lacking a properly grounded entrance panel
Rather than patching a system problem at the desk, it is much better to correct defects at the problem source.
Grounding
The amplifier and power supply cabinets ground through a safety ground pin on the power plug. This system
depends on a properly wired power outlet.
Lightning protection grounds do very little good at the operating desk. Lightning protection grounds belong at
the antenna cable entrance to the building. Antenna feedline and control entrance grounds
must
electrically
bond, with low impedance and resistance, to the powerline entrance ground.
RF grounds and lightning grounds are most effective at the antenna and at the feedline entrance, rather than the
operating desk.
There are ground lugs on the rear of the amplifier and power supply. These ground lugs are provided for use
with a station ground buss on the desk. A station ground buss helps ensure equipment cabinets on the desk are
close to the same electrical potential. These ground lugs are
NOT
for direct, independent, connections to
external ground rods or ground systems. The ground lugs are for connections to a desktop ground buss system.
A proper desk ground buss is a short, wide, conductor that runs the width of the operating position. All
equipment should bond to that buss, unless a manufacturer specifies otherwise.
ALS-1306 Exihibit VIII Page 5 / 27
