DB Broadcast KFG 500

The DB Broadcast KFG 500 is part of the KFG NEXT Series of FM amplifiers designed to operate across the full 87.5 – 108 MHz frequency range. These amplifiers incorporate several cutting-edge technologies that offer numerous advantages, including higher AC efficiency, reduced maintenance costs and time, a significant reduction in the need for air conditioning, uninterrupted service, and remote control capabilities. The KFG amplifiers can be equipped with either an air cooling system or a liquid cooling system to enhance longevity and maximize efficiency. Models below 1000W feature non-extractable power supplies.

Key Specifications:

• DB Broadcast KFG 500
  Compact Amplifier, 2RU size, 0-550 W output, with 0-8 W input. Housed in a single 19″x 2U cabinet.

FM Amplifiers KFG Series

• Frequency Range: Operates across the entire 87.5 – 108 MHz band for FM radio broadcasting.
• Power Range: Available from 100W to 40kW output power.

Main Characteristics

GREEN RF™ Technology
Utilizes GREEN RF™ technology combined with new 65:1 devices, evolving from the patented COLD-FET™ technology to provide:

• High RF efficiency (>70%)
• Enhanced safety and reliability
• Lower heating
• Reduced AC power consumption

Hot-Plug Solution (Optional)
For models over 5kW, an optional hot-plug system allows amplifier modules to be instantly extracted and removed with the amplifier still operating at full power. Modules slide on telescopic rails and can be removed for on-air maintenance or replacement without disconnecting any cables or interrupting transmitter operation.

Uninterrupted Service
Features an intelligent protection circuit that reduces output power without interrupting service, keeping RF devices within safe operating parameters in cases of:

• Load mismatching
• Environmental over-temperature
• Cooling failure
• Amplification module failure
• Power supply module failure

High Efficiency Cooling System
Equipped with a high-efficiency air cooling system that limits heat-sink temperature rise to only about 10°C above ambient, ensuring reliable operation even in extreme temperatures and harsh climates.

Highlights

Air Cooling
The KFG series’ oversized air cooling system extends transistor life. Amplifier modules feature externally mounted redundant fans, allowing easy cleaning or replacement without opening modules or interrupting operation.

Liquid Cooling
Features an oversized heat exchanger (single or double, optional), suitable for outdoor or indoor installations, equipped with single or double pump systems for maximum redundancy. This liquid cooling system assures high reliability and efficiency through specially designed heat-sinks and low-pressure liquid distribution, ideal for extreme climate conditions.

Advantages of Liquid Cooling:

• Reliable operation in harsh climates
• Significantly reduced need for air conditioning
• Operates effectively in dusty, humid, or saline environments
• Low acoustic noise and minimal heat radiation
• Extended life for transistors and active components due to lower operating temperatures

AAD Technology
Incorporates technology to prevent corrosion from air moisture, enhancing reliability with:

• Components made from anticorodal aluminum
• Air ducted away from electronic parts
• Electronic boards and cabling protected with tropicalized resin to guard against salt air

General Specifications

• Frequency Range: 87.5 to 108 MHz, adjustable in 10kHz steps
• Output Impedance: 50 Ω
• Spurious and Harmonic Suppression: Exceeds CCIR/FCC requirements
• RF Probe: 50 Ω, BNC
• Power Stability: < 2% (ALC)
• DC to RF Efficiency: 83% typical

AC Power Requirements

• AC Supply Voltage: 115 / 230 VAC ± 15%, single-phase, or 230/380 VAC ± 15%, three-phase
• AC Supply Frequency: 50 Hz or 60 Hz, ±5%
• Power Factor: > 0.9

Environmental Specifications

• Cooling: Forced air with built-in axial fans / Optional liquid cooling
• Service: Continuous 24/7 operation
• Operating Temperature: -5°C to +45°C (derate 3°C per 500 m above 2000 m asl)
• Relative Humidity: Up to 95%

The DB Broadcast KFG 500 FM Amplifier offers robust performance, advanced cooling options, and superior efficiency for reliable FM broadcasting operations in various environmental conditions.