FM amplifiers KFG series is designed to operate in the whole 87.5 – 108 MHz frequency range for FM radio broadcasting.
Power range from 100W to 40kW.

MAIN CHARACTERISTICS:

 

FM amplifiers KFG series GREEN RF™ technology
The GREEN RF™ technology, combined with the new 65:1 devices, is the latest evolution of the world-famous patented COLD-FET™ technology.

The main advantages are:

  • High RF efficiency (>70%).
  • Higher safety.
  • Higher reliability.
  • Lower heating.
  • Lower AC power consumption.
 

Hot-Plug Solution

All FM amplifiers KFG series over 5kW can be equipped optionally with the hotplug system to instantly extract the amplifier modules with amplifier in full power. All the amplifier modules slide on telescopic rails and can be completely extracted and removed for on-air maintenance or replacement without disconnecting any cable and without interrupting
the transmitter operation.


FM amplifiers KFG series Uninterrupted service
An intelligent protection circuit reduces the output power without on-air interruption, keeping the RF devices always within the safe operating parameters in case of:

  • Load mismatching.
  • Environmental over-temperature.
  • Cooling failure.
  • Failure in one or more amplification modules.
  • Failure in power supply modules.
 

High efficiency cooling system

The air cooling system limits the heat-sink temperature rise to only about 10°C above ambient temperature. This guarantees the properly functioning even at high temperatures and in sites with extreme climate conditions.

Air cooling
FM amplifiers KFG series oversized air cooling system widely extends transistor life. The amplifier modules are equipped with externally mounted redundant fans to allow easy and fast cleaning, or eventual replacement, without opening or removing any module and without
interrupting the transmitter operation.

 

Liquid Cooling
An oversize heat exchanger, single or double (optional), suitable for outdoor or indoor installation, and equipped with single or double (optional) pump system for maximum redundancy, is the main component of the powerful liquid cooling system. DB liquid cooling
system assures high reliability, cooling efficiency and easy installation, thanks to the special design of liquid cooled heat-sinks inside the amplifier and low pressure liquid distribution. This system is designed to successfully face every hard climate condition.

 

FM amplifiers KFG series Advantages of liquid cooling
Substantial advantages of our liquid cooling technology compared to air cooling are:

  • Properly working even with hard climate conditions.
  • Dramatically reduction of air conditioning needing.
  • Correct functioning in dusty environment even with high humidity or salinity.
  • Very low acoustic noise.
  • Low heat radiation into the environment.
  • Longer life for transistors and active elements due to colder continuous operation.
 

AAD Technology
Prevents corrosion from air moisture and increases reliability.

  • Components are made in anticorodal aluminum.
  • Air is ducted to avoid contact with electronic parts.
  • All electronic boards and cablings are tropicalized with a special resin to protect the circuits against salt air.

MODEL

OUTPUT POWER

OUTPUT CONNECTOR

RACK UNIT

RACK SUPPLIED

KFG 100

100 W

N

19" x 2U

No rack

KFG 300

300 W

N

19" x 2U

No rack

KFG 500

500 W

N

19" x 2U

No rack

KFG 1k

1000 W

DIN 7/16

19" x 2U

No rack

KFG 2k

2000 W

EIA 7/8"

19" x 3U

No rack

KFG 3k

3000 W

EIA 7/8"

19" x 3U

No rack

KFG 6k/1x

6000 W

EIA 7/8"

19" x 4U

No rack

KFG 6k/2x

6000 W

EIA 1+5/8"

19" x 19U

19" x 19U

KFG 8k

8000 W

EIA 1+5/8"

19" x 24U

19" x 24U

KFG 10k/2x

10 kW

EIA 1+5/8"

19" x 31U

19" x 31U

KFG 10k/4x

10 kW

EIA 1+5/8"

19" x 31U

19" x 31U

KFG 15k

15 kW

EIA 3+1/8"

19" x 41U

19" x 41U

KFG 20k

20 kW

EIA 3+1/8

19

19

KFG 30k

30 kW

EIA 3+1/8"

2 racks of 19" x 41U

2 racks of 19" x 41U

KFG 40k

40 kW

EIA 4+1/2"

2 racks of 19" x 45U

2 racks of 19" x 45U

GENERAL

Frequency range

87.5 to 108 MHz adjustable with 10kHz step

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% typ.

AC POWER REQUIREMENTS

AC supply voltage

115 / 230 VAC ± 15%, single-phase or 230/380 VAC ± 15%, three-phases

AC supply frequency

50 Hz or 60 Hz, ±5%

Power factor

> 0.9

ENVIRONMENT

Cooling Forced

Forced air with built-in axial fans / Liquid cooling (optional)

Service

Continuous 24/24h

Operating temperature

-5°C to +45°C Derate 3°C per 500 m above 2000 mt asl

Relative humidity

Up to 95%

© 2015 DB Elettronica Telecomunicazioni S.p.A.. All rights reserved.