3 / 38
User Manual
Rev. 1.0 - 29/06/09
PJ2500M-C, PJ3000HE, PJ3500M-C,
PJ4000U-K & PJ5000U-K
4. General Description
The
PJ5000U-K
is an RF amplifier for frequency modulation sound broadcasting
with a max. rated output of 5000 watts, for the
PJ4000U-K
the max. rated output
is 4000W, for the
PJ3500M-C
the max. rated output is 3500W, for the
PJ3000HE
the max. rated output is 3000W while for the
PJ2500M-C
model the max. rated
output is of 2500 watts. They are a fully solid-state apparatus of modern design that
use MOSFET as active components in the FM amplifying modules. This chapter
briefly describes the machine’s main features.
4.1 Make-Up
The
PJ5000U-K
,
PJ4000U-K
,
PJ3500M-C
,
PJ3000HE
and
PJ2500M-C
amplifiers
are made up of two interconnected modules pre-arranged for assembly in a 19”
rack.
The two modules are as follows:
•
Control and power supply module (called
PS
)
•
RF amplifier module (called
RF
)
RF Module
PS Module
Figure 4-1: PJ5000U-K, PJ4000U-K, PJ3500M-C, PJ3000HE and PJ2500M-C modules
Subdividing it into two modules not only makes it easier to handle and assemble the
amplifier but also permits to perform maintenance to the two parts separately.
The
PJ5000U-K
houses eight identical modules, based on the MOSFET SD2942
(2x), each supplies 650 watts; the
PJ4000U-K
houses eight identical modules,
based on the MOSFET BLF278 (2x), each supplies 550 watts; the
PJ3500M-
C
houses six identical modules, based on the MOSFET SD2942 (2x) device,
each supplies 600 watts; the
PJ3000HE
and
PJ2500M-C
model houses eight
modules, based respectively on the MOSFET SD2942 device, that supply 375
watts, instead.
The amplifier is controlled by a microprocessor-based system that includes a LCD
which carries out the following functions:
• Measuring and displaying amplifier work parameters
