Solid State Amplifiers
Generals. This FM amplifier is designed to operate on 87.5 - 108 MHz frequency range for FM radio broadcasting appliances, giving up to 550 W of output power in continuous service.
COLD FET™ technology. This revolutionary technology,
a ITEL international patent, is used in the FA 300 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 the amplifier module
failure in power supply modules
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.
Switch-mode power supply. High efficiency (> 80 %) and oversized power supply modules grant low heating, low AC power consumption and superior reliability.
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.
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 ( KFA/RC ) 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.
Solid State Amplifiers
RF specifications:
Operating frequencyrange 87.5 ÷ 108 MHz
Max. output power 0 - 550 W
Input power 0 - 12 W
Input connector N
Output connector DIN 7/16'' (otherson request)
Power consumption (at maximum power) 690 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) 80% typ.
Overallefficiency 69% typ.
Measures (onthe front panel):
Total output forwardpower
Total output reflectedpower
Output forwardpower ofthe RF stage
Output reflectedpower ofthe RF stage
DCsupplyvoltage ofthe RF stage
DCsupplycurrent ofthe RF stage
Protections:
The internal logic circuitry provides proportional fold-back protection,without
on-air interruptions,for:
VSWR
air over-temperature or insufficient cooling
output combiner unbalancing
fault of RF or power supply stage
Automatic power control:
The automatic power control circuitry provides the output power regulation
with a precision of 2% over the whole band.
Remote control interface:
I/O Connector DB-25
Monitored & controlled functions:
stand-by
Total forward output power
Total reflected output power
DC supply voltage of the RF stage
DC supply current of the RF stage
alarms status
AC Power requirements:
Type of DC voltage regulation switch-mode
Operating Voltage 110/220/240 Vac ± 10% Vac 50/60 Hz, single-phase.
Operating conditions:
Cooling forced air by internal fans
Service continuous 24/24 h
Operating temperature -5°÷ +45°C
Relative humidity 95%
Max.installation altitude 3000 m a.s.l.
Mechanicals:
Weight 27 kg
Dimensions (W x D x H) 483 x 640 x 132 mm - single rack
ITEL S.r.l. TELECOMUNICATIONS AND BROADCASTING SERVICES Via Friuli, 6 - 33074 Fontanafredda (PN) - ITALY Tel. +39 0434 997667 - Fax. +39 0434 997687