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PJ2000M-C, PJ2500M-C & PJ3000M-C
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User Manual
Rev. 1.5 - 09/01/09
4. General Description
The
PJ3000M-C
is an RF amplifier for frequency modulation sound broadcasting
with a max. rated output of 3000 watts, for the
PJ2500M-C
the max. rated output
is 2500W while for the
PJ2000M-C
model the max. rated output is of 2000 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
PJ3000M-C
,
PJ2500M-C
and
PJ2000M-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: PJ3000M-C, PJ2500M-C and PJ2000M-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
PJ3000M-C
houses six identical modules, based on the MOSFET BLF278
(2x) device, each supplies 550 watts; the
PJ2500M-C
and
PJ2000M-C
model
houses eight modules, based respectively on the MOSFET SD2942 and BLF278
device, that supply 350 and 300 watts each, 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
• Activating and deactivating power delivery
• Protecting the amplifier as far as potentially harmful situations are concerned
such as excess supplied power, SWR, excessive pilot power or temperature
Содержание PJ1000M-C
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