Product Discription:

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MAIN FEATURES OF THE 3KW FM DIGITAL TRANSMITTER MANUFACTURED BY OMB:
 

• AC Efficiency: 72% (typical value). RF Efficiency RF: 84% (typical value)
• 4 amplifying modules of 900W with MOSFET technology
• 3 independent switching power supplies connected in parallel so if there is a failure in any of them the equipment maintains its operation
• TFT screen and touch keyboard for the control and visualization of operational parameters.
• Memory registration of events
• Control of the speed of cooling fans depending on the temperature at the power modules for optimizing power consumption and decreasing acoustic contamination
• Advanced protection against load mismatches without interrupting the transmission and ultra-fast protection in case of excessive reflected power and input power
• Analog telemetry, digital RS232 remote control and telemetry, remote control by opened/closed contacts.
• Low pass filter, EMI filters and internal single-phase transient suppressor
• Automatic power reduction at night if the amplifier is combined with the EM 25 DIG PLUS
• Automatic power reduction in case of high temperature, the equipment returns automatically to its rated power value when the temperature reaches back an average value
• Automatic power reduction in case of failure of one of the power supplies and in case of excessive reflected power.
• Automatic voltage control for efficiency optimization

GENERAL CHARACTERISTICS

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AMPLIFIER FMA 3000 HE
FREQUENCY RANGE	87.5-108MHz
INPUT RETURN LOSS	-20dB
INPUT POWER	<25W
OUTPUT POWER	3-3.5KW nominal, manual and automatic adjustable
POWER GAIN	>21.3dB minimum
TOTAL EFFICIENCY	>73% typical
RF EFFICIENCY	84% typical
COOLING	Forced air, speed control of fans
HARMONICS LEVEL	-82dBc
INPUT/OUTPUT IMPEDANCE	50Ω
RF INPUT CONNECTOR	N(F)
RF OUTPUT CONNECTOR	7/16"or EIA 7/8" (under request)
RF MONITOR CONNECTOR	BNC(F)
POWER SUPPLY	230VAC ±15% → 195 ÷ 265VAC, 50/60Hz
CONSUMPTION	4200VA (@3000W output power)
PROTECTIONS	Reflected power, forward power, overdrive, and overcurrent in power modules. Smart temperature protection. Ultra-fast protection against reflected and input power. Real time registration of events. Exciter’s inhibition
TELEMETRY AND REMOTE CONTROL	Analog telemetry (direct and reflected power measurements). Digital telemetry and remote control RS232. Remote control by opened/closed contacts
OPERATION TEMPERATURE	-5 to +40°C
WEIGHT	45Kg approx. (without rack)
DIMENSIONS	5 standar

EXCITER EM 25 DIG PLUS
FREQUENCY RANGE	87.5-108MHz
FM MODULATION	75KHz (adjustable) peak deviation. Mono 180kF3E and Stereo 256kF3E
AUDIO/MPX INPUT LEVEL	-3.5 @ +12.5dBm @ 75KHz deviation
AUDIO INPUT CONNECTORS	XLR(F)
AUXILIARY CHANNEL (RDS/SCA) INPUT LEVEL	7.5KHz deviation: -12.5 to 3.5dBm and 2KHz deviation: -24 to -8dBm
AUX. CHANNEL INPUT IMPEDANCE	10kOhm
MODULATION DISTORTION	7.5Khz deviation: <0.05%, 0.02% typical; 2KHz deviation: <0.2%, 0.05% typical
S/N MONO RATIO	30 to 20000Hz: >76dB, 86dB typical, CCIR: >75dB, 81dB typical

 

Technical specifications:

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S/N STEREO RATIO	30 to 20000Hz: >72dB, 77dB typical, CCIR: >68dB, 72dB typical
AUDIO CHANNELS BANDWIDTH	30 to 15000Hz ±0.1dB
PRE-EMPHASIS TIME CONSTANT	Selectable, 25/50/75 microseconds
RF NOMINAL OUTPUT POWER	25W
TUNING STEPS OF TRANSMITTER	10/100KHz
ALC OUTPUT POWER STABILITY	±3%
SPURIOUS AND HARMONIC EMISSIONS	<80dBc
RF OUTPUT IMPEDANCE	50Ω
RF INPUT POWER CONNECTOR	N
RF SAMPLING CONNECTOR	BNC
POWER SUPPLY	110-230Vac ±15% 50-60Hz
OPERATION TEMPERATURE RANGE	0 to 40°C recommended, -10 to 55°C max.
RELATIVE HUMIDITY	Up to 95% without condensation
DIMENSIONS	484x300x90mm, 2 standard rack units of 19"
WEIGHT	7Kg