R.V.R. Elettronica PJ5KPS, User'S & Technical Manual

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PJ5KPS
7 / 80 User & Technical Manual Rev. 1.5 - 08/02/06
4. General Description
The PJ5KPS is a RF amplifier for frequency modulation sound broadcasting. It is a
fully solid-state apparatus of modern design that uses MOSFET as active components
in the FM amplifying modules. This chapter briefly describes the machine's main
features.
4.1 Composition
The PJ5KPS amplifier is made up of modules inserted in a 19" rack. The main
modules are as follows:
• 1 Control unit
• 5 1.2 kW RF amplifier modules
• 1 Control unit
•
1 or 2 Power supply unit carriages
•
1 Splitter/Input RF
The amplifier is supplied complete with all its parts, not really "modules", essential
for its operation such as the fans for dissipating the heat generated by the machine
inside the room and all the accessories for the electrical and RF wiring. As a rule, the
amplifier is supplied as a complete transmitter therefore the two FM exciters that it
manages will be provided and connected (a service exciter and a spare exciter).
4.2 Technical specifications
Frequency range 87.5 to 108.0 MHz
Nominal RF power 5000 W
Power supply voltage 380 Three-phase, 3F+N
Exciting power Max. 30 W
Consumption < 9.5 kW
Power factor > 0.95
Additional important features of the PJ5KPS are as follows:
• The 1.2 kW amplifying modules are implemented by means of plug-in technology:
the individual modules may be removed for performing maintenance operations,
for instance, without having to turn off the transmitter. The transmitter keeps working
at reduced power even if the module has been removed. This operation may be
carried out without any risk of damaging the module itself, or the amplifier as a
whole, thanks to the control system and to the RF connectors, the power supply
and the purposely designed data-exchange. For further information refer to the
maintenance section.
• Each module is controlled by a microprocessor-based card that checks and
adjusts its operating mode. The resulting data are transmitted to the control unit.
•
The control unit manages the changeover of the two exciters both in automatic
and manual mode.