R.V.R. Elettronica PJ1000M-C, Руководство пользователя

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PJ2000M-C, PJ2500M-C & PJ3000M-C
3 / 40 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