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User Manual
Rev. 1.0 - 05/04/13
PJ3500M-C & PJ5000U-K
4.2 Features
The overall efficiency of
PJ3500M-C & PJ5000U-K
is better than 70% across the
bandwidth, for this reason are part of
RVR Green Line
family.
This performance characteristic is guaranteed in a range b0.25 dB and -3
dB (+5% and -50%) referred to the nominal power of the equipment: for example
from 1750W to 3675W in case of
PJ3500M-C
, or from 2500W to 5250W in case
of
PJ5000U-K
; outside these limits the equipment is able to work properly but can
not guarantee an efficiency of 70%.
The operating logic during the output power regulation, which is necessary in order
to not deteriorate the efficiency even of 5-6%, expects to set the pilot power to
the optimum power (dependent on the amplifier: for example the
PJ3500M-C &
PJ5000U-K
requires 50 W) and then successively adjust the bar setting of power
on amplifier in order to obtain the desired output power.
The
PJ3500M-C
houses six identical modules, based on the LD-MOSFET
(MRF6VP11KH), each supplies 800 watts; whereas
PJ5000U-K
model houses
eight modules, based respectively on the LD-MOSFET (MRF6VP11KH) device,
each supplies 800 watts.
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
• Detecting the warning thresholds set by the user (e.g. power delivered below
a specific threshold), which are made available to the user via the telemetry
connector
• Communicating with external devices
The amplifier’s control software is based on a menu system through which the
user may navigate using the following four buttons:
ESC
, , , and
ENTER
. A
fifth button is provided for resetting any triggered alarms.
The PS module of this amplifier houses three rectifier/power supply switching units
that normally work in parallel mode and that provide a fair degree of redundancy to
the machine. Even if one of the power supply modules breaks down the amplifier
will keep working at reduced power.
A schematic view of the operating theory of amplifier is shown in the figure:
