FA 1000
Solid State Amplifiers


Generals. This FM amplifier is designed to operate on 87.5 - 108 MHz frequency range for FM radio broadcasting appliances. It gives 1 kW of output power in continuous service.

Lowest dimensions and weight in the market. A new coupling architecture permits a dramatic reductions of, dimensions, weight and cooling, simplifing transport, installation and maintenance. The amplifier height is only 132 mm (3U).

COLD FET™ technology. This revolutionary technology, a DB Elettronica international patent, is used in the KFS 1000 amplifier to optimize the input matching of MOS-FET transistors in order to obtain broadband amplification stages 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 RF stage
failure in power supply modules

High modules redundancy: The KFS 1000 1 kW amplifier is composed of 4 x 300 W stages coupled with high isolation combiners. This architecture assures the highest module redundancy.

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.

The switch-mode power supply is largely oversized and guarantees a regular operation even in the presence of wide main voltage fluctuations: the switching converters contribute to obtain a very high AC to RF efficiency (67% typ.).

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.

Meets or exceeds international standards for safety and electrical specifications.


FA 1000
Solid State Amplifiers

RF specifications:
Operating frequencyrange 87.5 ÷ 108 MHz
Max. output power 0 - 1000 W
Input power 0 - 20 W
Input connector N
Output connector EIA 7/8'' or DIN 7/16''
Power consumption (at maximum power) 1492 W
Input and output impedance 50 W
Spuriousandharmonic suppression(ref.to carrier) < - 82 dBc
Synchronous AM (ref. 100% mod.) < - 50 dB
Asynchronous AM (ref. 100% mod.) < - 50 dB
RF Probe -50dBc, 50 W, BNC
Power stability < 1%
RFefficiency (before the output filters) 85% typ.
Overallefficiency 67% typ.

Measures (onthe front panel):
Output forward power
Output reflected power
DC supply voltage of each RF stage
DC supply current of each RF stage


The internal logic circuitry provides proportional fold-back protection,without on-air interruptions,for:
air over-temperature
insufficient cooling
fault of RF or power supply stage

Automatic power control:
The automatic power control circuitry provides the output power regulation with a
precision < 2 % over the whole band.

Remote control interface (optional):

Monitored and controlled functions:
Stand by
Forward output power
Reflected output power
DC supply voltage of each RF stage
DC supply current of each RF stage
alarms status
I/O Connector DB-25

AC Power requirements:
Type of DC voltage regulation switch-mode
Operating Voltage 220/240 Vac ± 10% Vac 50/60 Hz, single-phase.

Operating conditions:
Cooling forced air by internal fans
Service continuous 24/24 h
Operating temperature -5°÷ +43°C
Relative humidity 95%
Max.installation altitude 3000 m a.s.l.

Weight and size:
Weight 23 kg
W x D x H (see options) 483 x 543 x 132 mm

KFS/RC Full remote control interface


ITEL S.r.l.
Via Friuli, 6 - 33074 Fontanafredda (PN) - ITALY
Tel. +39 0434 997667 - Fax. +39 0434 997687