12/20/11
888-2595-001
2-9
WARNING: Disconnect primary power prior to servicing.
Section 2 Installation
ZX Series
Lightning and transient energy via the power line or tower connections can impose
serious threats to personnel safety, as well as damage the equipment. For these reasons,
a good protective grounding system to divert these forms of energy to earth ground is
imperative. The energy in a lightning strike has a very fast rise time and can have
frequency components up to the megahertz range. For this reason, it is always preferred
to use straight, direct runs of large, flat conductors so as to minimize inductance and
allow the free passage of transient energy to earth. Note that the small cross-section and
non-direct path to ground of the green/yellow wire of the AC safety ground make it an
unsuitable means for safely diverting the transient energy present during a lightning
strike.
A good grounding system should include substantial grounding at the tower base using
copper ground rods and/or a buried copper ground screen, with copper strap used to
connect the tower base to earth ground. Coaxial cable shield(s) should be electrically
connected to and exit the tower as near to the bottom as practical to minimize the
lightning voltage potential carried by the cable back to the transmitter building.
Ideally, a common grounding plate (bulkhead panel) with a low impedance connection
to building earth ground should be the entry point to the transmitter building for all
signal lines, including AC mains. It should serve as a single-point ground for all
coaxial and mains surge protection devices. Wide copper straps should be used for
making the connection from the common grounding plate to earth ground.
A good ground system should include perimeter grounding of the transmitter building
using copper ground rods and copper strap. There should also be a copper strap running
from tower ground to the building perimeter ground.
A ground system that has been in place for a long period of time can deteriorate and
should be inspected periodically. This is especially true at the point where the ground
strap enters or exits the building. All ground connections should be bolted and brazed
together.
Good grounding and shielding practices will also help keep stray RF current to a
minimum. RF interference usually shows up as intermittent problems with digital/
control circuits, spurious radiated emissions, or audio/video noise if analog signals are
present. Even a small amount of non-shielded wire makes a very efficient antenna for
RF and transient energy. Wire and cable shields should be connected at both ends to the
equipment chassis.
2.9
Cooling System Requirements
ZX series transmitters use forced air cooling provided by multiple internal blowers to
remove the heat generated by the signal generation and amplification process.
Summary of Contents for ZX10
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