Generals. This
FM amplifier is designed to operate on 87.5 - 108 MHz frequency
range for FM radio broadcasting appliances, giving up to 5 kW of
output power in continuous service. The amplifier cabinet has the
spacing room compatible with all the DB's exciters.
° Lowest dimensions and weight in the
industry. A new
coupling architecture permits a dramatic reductions of, dimensions,
weight and cooling, simplifying transport, installation and
maintenance.
° COLD FET™ technology. This
revolutionary technology, a DB Elettronica international patent, is
used in the KF 5000 amplifier to optimize the output matching of
MOS-FET transistors in order to obtain an amplification circuit
without any RF component. This means:
- high RF efficiency > 83%
- lower heating
- higher devices safety
- higher total reliability
- low AC power consumption
° Extraordinary RF efficiency: the
COLD-FET™ technology allows to obtain from the amplifiers the full
power rating reducing of almost 20% the devices recommended
operating DC voltage and current.
° Uninterrupted service. A
proportional foldback protection circuit reduces the output power
without any on-air interruption, keeping the RF devices always
within the safety conditions in case of:
- load mismatching
- environmental over-temperature
- cooling failure
- failure in one or more amplification modules
- failure in power supply modules
° High modules redundancy: each
1 kW plug-in module is composed of 4 x 300 W stages coupled with
high isolation combiners and independent power supply. This
architecture assures the highest module redundancy.
° High system redundancy: after
the plug-in module redundancy starts the great system redundancy
realized through the coupling system that permits to the amplifier
to work at reduced power even in case of module failure.
° On-air serviceable. The
1 kW modules replacement can be made without turning-off the
amplifier.
° High gain 18
dB gain permits the full output power with low input driving.
° Broadband: no
adjustments are required for the full power operation in the
87.5÷108 MHz band.
° The automatic
power control circuit adjusts
and stabilizes with precision (±1%) the maximum output power in the
whole band.
° Switch-mode power supply. High
efficiency (> 85 %) and oversized power supply modules grant low
heating, low AC power consumption and superior reliability.
° Low overheating. The
high cooling system efficiency limits at only + 10°C the heatsink
overheating respect to the environmental temperature. This permits
the service even in overheated sites.
° Low consumption. The
high overall efficiency means a reduction of AC power consumption
and operating costs.
° Reduced maintenance. Easy
accessibility of all parts, no RF failure, no power supply failure,
external serviceable air filter reduce dramatically the maintenance
costs.
° Metering. A
complete metering system placed on the front panel permits the
precise reading of: all currents and voltages of each MOS-FET stage,
forward power, reflected power.
° Remote control. It
is available as option a remote control interface for the following
parameters: voltages and currents of each RF stage, forward power,
reflected power, alarms status, on/off, stand-by.
