Specifications

TUNING PROCEDURE
The Crescend Technologies High Power UHF RF power amplifier is designed for paging and other
applications that use a single carrier constant envelope waveform. The amplifier is designed to be powered
from either an external +48 VDC source or an optional internal AC power supply. Model HA amplifiers cover
the 450-454MHz, 456-462.5375MHz, 462.7375-467.5375MHz, 467.7375-470 MHzMHz band without
retuning. Amplifier specifications are shown in Table 1-1. There are seven input ranges available as shown
in Table 1-2. Closed loop power control is used to maintain a constant output power under varying voltage,
signal input level, frequency and output load conditions. Several design features work to protect the
amplifier under adverse conditions.
As indicated above, there are no tuning procedure for these amplifiers.
Table 1-1 Amplifier Specifications
Specification Value
Instantaneous Bandwidth
450-454MHz, 456-462.5375MHz,
462.7375-467.5375MHz, 467.7375-470 MHzMHz (HA
models)
Output Power Range 25 W - 250 W
Input Impedance 50 Ohms
Output Impedance 50 Ohms