FM AMPLIFIERS

broadband fm amplifiers

The DB Digital Broadcast amplifiers of the KFG and KFG NEXT lines are ideal for stations requiring modular transmitters and thus high configuration flexibility.

FM amplifiers form 100W to 50kW

The following lines are available:

• KFG, compact solid-state FM amplifiers from 100W to 500W
• KFG NEXT compact single module, solid-state FM amplifiers from 1000W to 7000W
• KFG NEXT modular, solid state FM amplifiers from 10kW to 50kW

They are available for the FM band and require no adjustment when changing the transmitter frequency.

The basic structure is also adaptable for use outside broadcasting and are therefore also perfectly suited for scientific use (refer to SCIENCE section for more information).

Green FM AMPLIFIERS with LOW ENERGY CONSUMPTION

These transmitter families are built with the revolutionary GREEN RF™ technology that achieves the highest level of RF efficiency by minimising the energy power consumption and heat dissipation at the station. That can translate in a drastic reduction in both the cost of energy consumption to power the amplifier and the cost of cooling/air conditioning in the station.

Comparing the consumption of old-generation amplifiers with the new models currently in production, the efficiency in just a few years, thanks to the new technologies adopted by DB, has increased by almost +50%, resulting in transmitted power/consumption ratios of up to 75% overall.

In all amplifiers, an ALC (Automatic Level Control) system has been implemented, which modifies the supply voltage of the RF modules to ensure that the active devices operate at their optimum working point under all conditions (both in the event of normal operation and in the event of a fault): this always guarantees minimum consumption and maximum system efficiency under all operating conditions.

EASY MAINTENANCE OF FM AMPLIFIERS

DB amplifiers maintenance has been made as easy as possible thanks to a design strongly oriented towards optimising service and intervention times. A significant example is the presence of fans that can be accessed and replaced from the outside in a few seconds without having to open the transmitter or switch it off (maintenance without off air time). Another example is the ease of access and cleaning/replacement of the air filters. The internal design has been redesigned to minimize wiring and thus allow easier replacement of boards when needed.

On models with a power equal to or greater than 1000W, the power supplies are hot-plug and they can be replaced in a few seconds without switching off but simply removing the front panel while the transmitter is in full operation.

In the case of power ratings equal to or greater than 6kW, the internal logic allows automatic control of the balance of the absorbed currents using ACS (Automatic Current Sharing) technology: in case of one power supply fail, the others are optimized to reduce the danger of overloads and maximize the output power level, thus minimizing the loss of power and consequently the loss of signal coverage.

In some versions of PFG NEXT transmitters (line/MPA ‘Multiple Power Amplifiers’), even the RF modules can be replaced hot-plug in a few seconds from the front panel without having to stop the transmission, so that maintenance can be carried out quickly and transmission downtime is reduced to zero (resulting in zero complaints from listeners and sponsors and no costly service interruptions).

DB has also implemented in its FM amplifiers a protection system that allows signal transmission to continue under safe conditions even in the event of an increase in reflected power, increase in temperature of the station, failure of the power supply/RF modules, thanks to a reduction in output power (foldback) that allows the operation under safe conditions indefinitely until the arrival of the technician. This means that the output power is not anymore present only in the event of extremely serious alarms that affect the safety of the station, while guaranteeing maximum continuity of service in normal cases of mulfunctions.