DB Broadcast KFG Next 3500 - Compact Amplifier 3RU
0‐3.500 W out, with 0‐20 W input. Single 19"x 3U cabinet.
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.
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:
High RF efficiency (>70%).
Lower AC power consumption.
Hot-Plug Solution (optional)
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.
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:
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.
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.
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.
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.
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 41U||2 racks of 19" x 41U|
|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|
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|Cooling Forced||Forced air with built-in axial fans / Liquid cooling (optional)|
|Operating temperature||-5°C to +45°C Derate 3°C per 500 m above 2000 mt asl|
|Relative humidity||Up to 95%|