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antenna or feed line installation problem. Typical problems causing desktop RF
problems include the following:
1. Lack of suitable baluns or chokes.
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 the correction, repair, or replacement of defective equipment is in
order.
The only proper line-isolator installation points are either just outside the operating room
entrance and/or close to the problem’s actual source. If the desktop has defective
cables or connectors, or poor equipment cabinet design, locate and correct the actual
problem.
Summary of Contents for ALS-1406/S
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