User's Manual

3.8. It is possible to significantly reduce the output power, pulling filter “SH/D” to the ground (C5 units only). However,
it is possible to change the output power smoothly by a trimmer resistor (50 kOhm is the recommended value of it),
connected between this pin and the ground.
3.9. The output power drops to about 75% of rated level, if the filter “CTRL” is pulled to the ground (C5 units only).
• Notice: The manufacturer’s rated output power of this equipment (see Table 1-1) is specified for single carrier
operation using constant-envelope modulation. This equipment is NOT designed for multiple-carrier operation, nor is it
intended to be used with non-constant envelope modulation types.
Table 1-1. Amplifier Specifications
Specification Value
Instantaneous Bandwidth 403-450MHz
Output Power 50W
Input Impedance 50 Ohms
Output Impedance 50 Ohms
Table 1-2. Amplifier Input Power Ranges
Input Power Designator Code Input Power Range Nominal Gain (350W Output)
R1 0.1-0.2 W 27.0 dB
R2 0.2-0.5 W 24.0 dB
R5 0.5-0.5 W 20.0 dB
1 1-2 W 17.0 dB
2 2-5 W 14.0 dB
5 5-10 W 10.0 dB
10 10-20 W 7.0 dB
20 20-50 W 4.0 dB
3.10 RF ENERGY EXPOSURE AWARENESS, CONTROL INFORMATION, and OPERATIONAL INSTRUCTIONS for
COMPLIANCE with FCC RF EXPOSURE LIMITS
NOTICE: This power amplifier product is intended for use in environments in which personnel have full
knowledge of their exposure and can exercise control over their exposure to meet FCC limits. This power
amplifier is NOT authorized for use by the general population, consumer, or for use under conditions where
unintended or accidental exposure may occur.
This power amplifier product generates electromagnetic energy in the radio frequency (RF) spectrum to provide
communications between users over a distance. RF energy is one specific form of electromagnetic energy. Other forms
include, but are not limited to, sunlight and x-rays. RF energy, however, should not be confused with these other forms of
electromagnetic energy, which when used improperly, can cause biological damage. Very high levels of x-rays, for
example, can damage tissues and genetic material.
Experts in science, engineering, medicine, health, and industry work with organizations to develop standards for safe
exposure to RF energy. These standards provide recommended acceptable levels for personnel who may be exposed to
RF energy. The RF exposure levels described therein include substantial margins of protection.
When properly installed and used, Crescend power amplifier products meet all government-established RF exposure
levels. In addition, Crescend recommends specific operating instructions for users of its power amplifier products. These
instructions are important because they inform users about RF energy exposure and provide simple procedures on how
to control it.
Please refer to the following Web sites for more information on the nature of RF energy exposure and how to control your
exposure to assure compliance with established RF exposure limits.
http://www.fcc.gov/oet/rfsafety/rf-faqs.html
http://www.osha.gov/SLTC/radiofrequencyradiation/index.html