R.V.R. Elettronica VJ30000-TE, Инструкция по установке, техническому обслуживанию и ремонту

Страница: 12 / 78

Data redazione: 25/07/03 R.V.R. Elettronica S.r.l. (BO) VJ30000-TE - R.F. Tube Amplifier
12
CHAPTER 1
TX30000-TE GENERAL DESCRIPTION
1.1) TRANSMITTER DESCRIPTION
The TX30000-TE/V1 is an FM broadcast transmitter working in the frequency band from
87.5 MHz to 108 MHz. The transmitter is composed of a modulator (mono or stereo) mod.
PTX30LCD, a driver amplifier mod. PJ1000M and a tetrode final amplifier mod. VJ30000-
TE for the antenna connection.
The transmitter is composed of two 19" racks, 40 HE each, meccanically and electriccally
connected together, so that, when the installation is completed, to realize a single functional
equipment that shows on the right side the driver amplifier, the modulator and the power
supply and service section for final stage amplifier, and on the left side shows the final
amplifier cavity and the general air cooling section.
The final power amplifier uses the tetrode 4CX20000C grounded grids configured with
cathode excitation.
1.2) ELECTRICAL DESCRIPTION
The VJ30000 ia a tube amplifier with utilize the tetrode 4CX20000C grounded grids
configured with cathode excitation.
This amplifier is able to operate with several output max power values but inferior to 27 Kw
continuous with a driver power of about 1000W.
The amplifier show plate pipes, load and input motorised, allowing coverage of the entire
frequency band.
The VJ30000 has been designed to use a 3-phase supply (3-phase option without neutral).
1.3) FRONT PANEL DESCRIPTION
The working parameters values and commands are available separately on each equipment.
About the description of the modulator and driver amplifier see as reference its manual
issued to the transmitter; in fact, these equipment are autonomous and they are only
contained in the complete transmitter rack.
About the final power amplifier are available the readings of the following working
parameters:
A) forward and reflected output power on a single meter, selectable by a selector placed on
the itself meter;
B) control and screen grid currents on a single meter, selectable by a selector placed on the
itself meter;
C) plate current;
D) plate voltage, control grid voltage, screen voltage, filament voltage and filament current
on a single multimeter, selectable by a totative selector placed on the itself multimeter;
E) output cavity air temperature and number of the protection interventions on a alpha-
numeric display at double two digits;
F) indication with the working hours of the tetrode filament on hour counter;
G) active alarm led indications (red color) relative to anomalies caused to excessive plate,
control grid and screen grid currents, excessive reflected power, insufficient control grid
voltage, plate voltage enabled but not present, insufficient air pression in the cavity,
excessive air temperature on the output cavity;
H) INTERLOCK led indicator to indicate the block of the equipment caused to personnel
safety.