Revision 2
12
CAUTION! Before connecting the power supply to an electrical outlet, always be sure you have
completed the following four steps:
1. Insert the 15-ampere 250V fuses into the two black fuse caps.
2. Insert the fuse and cap assemblies into the power supply’s fuse holders. The fuses lock in
place with a slight turn.
3. Connect the power supply to the amplifier.
4. Be sure the amplifier power switch is off.
Caution! Fuses have both voltage and current ratings. Use only
250V rated fuses in this device. The voltage rating is generally
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 the four steps above!
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),
reduces lightning damage, or improves signal levels. Generally, changes in RFI or signal quality,
with the addition or removal of a station ground, indicate an antenna or feed line installation
problem. Typical problems causing desktop RF problems include the following:
1. Lack of suitable baluns
2. Improper feed line 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 feed line 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
source.
Coaxial Line Isolators
Never install coaxial line isolators between desktop radio equipment. The goal of every operating
position is to maintain all equipment cabinets and housings at the same RF potential. Isolators on
or near the desk are contrary to this goal, and actually promote or encourage cabinet or chassis
RF potential differences. If an RF problem appears at the operating position; correction, repair,
or replacement of defective equipment is in order.
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