EM 10000

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EM 10000 is a 10000W FM transmitter made up of the EM 250 COMPACT DIG exciter and two control units which combine the power of four AM 2500 FM amplifiers. AM 2500 includes eight 350W high-efficiency MOSFET technology amplifying modules, fed by 2 independent switching power supplies, which are made to withstand the working conditions. The amplifiying modules works independently thanks to a power combining structure that provides high isolation between them.
The equipment includes a low-pass filter at the antenna output, EMI filters at the utility connection and an internal transient suppressor. The LCD display shows the amplifier main parameters: supply voltages, 8 module currents, direct, reflected and input power, power loss in the internal unbalance load and three temperature sensors. The amplifier control system stores in their memory all events and alarms detected, showing time and date of occurrence.
Smart temperature protection: if temperature rises up to a level dangerous for the modules, the output power is reduced until the temperature goes back to a normal state. If, even with the power reduction, the temperature keeps on rising, then the amplifier is stopped until the temperature goes down.
Reflected power protection (load mismatch): when the control system detects that the V.S.W.R. is dangerous for the modules, it reduces automatically their output power so as not to exceed the internal security level. Besides, there is a fast protection system that instantaneously turns off the modules polarization when it detects a peak on the reflected power sensor.
Automatic gain control: it reduces the gain in the case of excessive driving power, keeping the adjusted output power despite temperature changes. The control allows manual power adjustment by means of the front keyboard.
The amplifier includes Analogue Telemetry (Direct and Reflected power measure), Digital RS-232 telemetry and remote control, Remote control through open-close contacts and a Multi-device bus connection for internal use.

TECHNICAL SPECIFICATIONS

AM 2500
FREQUENCY RANGE 87,5 ~ 108MHz
OPERATING CLASS B
INPUT RETURN LOSS <-20 dB
INPUT POWER 30W
OUTPUT POWER 2,500W nominal, manual and automatic adjustment
TYPICAL EfFICENCY 70%
COOLING Forced air
HARMONICS LEVEL <83dBc
INPUT/OUTPUT IMPEDANCE 50Ω
RF INPUT CONNECTOR N Female
RF OUTPUT CONNECTOR EIA 1-7/8’’
RF MONITOR CONNECTOR BNC Female
POWER SUPPLY 220 Vac ±15% → 190 ~ 250 Vac
50/60Hz
consumption <5,000W, typ. 4,200W
PROTECTIONS -Reflected, Forward power, overdrive,
overcurrent in modules
- Smart Temperature protection
- Reflected power protection (load mismatch)
-PRFL automatic control + Fast
protection
- Automatic Gain Control
- Real-time events register
- Exciter inhibition
REMOTE CONTROL AND TELEMETRY - Analog telemetry (direct and
reflected power measurement)
- Telemetry and RS-232 digital remote
control
- Remote control by open / closed
contacts
- Multi-device bus
OPERATING TEMPERATURE -5 to +40ºC
Dimensions 25RU standard 19’’
operating humidity 95%

EM 250 COMPACT DIG
AUDIO
S/N ratio (30 ~ 20000Hz)
Mono ≥78dB (86dB typical)
stereo ≥72dB (77dB typical)
weightED S/n RATIO (CCIR)
Mono ≥75dB (81dB typical)
stereo ≥68dB (72dB typical)
T.H.D. Distortion (limiting threshold adjusted at 150kHz deviation)
75 KHz deviation <0.05% (0.02% typical)
150 KHz deviation <0.2% (0.05% typical)
stereo channels crosstalk (L / R)
with external encoder <-50dB
with internal encoder (100 ~ 5000Hz) <-60dB
with internal encoder (30 ~ 15000Hz) <-50dB
audio input frequency response
30 Hz ~ 15 KHZ (pass band) ± 0.1dB
f >19 KHZ (rejected band) > 50dB
stereo input (MPX) frequency response ± 0.1dB from 10Hz to 100KHz
aux. input (SCA/RDS) frequency response ± 0.2dB from 10KHz to 100KHz
input levels
Audio and MPX (AT ?75 KHz deviation) -3.5 ~ +12.5dBm adj.
SCA/RDS (AT ?7.5 KHz deviation) -12 ~ +3.5dBm adj.
SCA/RDS (AT ?2 KHz deviation) -24 ~ -8dBm adj.
imput impedance
Audio and MPX 10KΩ balanced / 600Ω unbalanced (selectable)
Auxiliar SCA/RDS 10KΩ
Connectors
Audio XLR Female
MPX, Auxiliar (SCA/RDS) BNC Female
common mode input rejection (20 ~ 15000HZ) >50 dB (>60 dB typical)
MPX OUTPUT LEVEL 0 ~ +10dBm (75KHz deviation)
deviation limit 0 ~ +7dBm adj.
Pre-EMphasis time constant 50 or 75µs ± 2%
Modulation
frequency range 87.5 ~ 108MHz
modulation mode FM (75KHz peak deviation)
MODULATION CLASS F3E, F8E
carrier frequency tuning step 10 / 100KHz
frequency offset < ± 200Hz
frequency drift <100Hz / year
RF
RF output power 0 ~ 250 WRMS adj.
max. reflected power allowed 25W
harmonicS <-70dBc
spurious <-80dBc (-95dBc typical)
output impedance 50Ω (N Female connector)
control and protection - Protection against spurious emissions
- Reflected power protection
- Power level automatic reduction at night
general features
AC power supply 90 ~ 260VAC, 50/60Hz
power consumption 445VA (250W RF)
temperatura range 0 ~ 35ºC recommended
-10 ~ 45ºC maximum
control signals RF enable
RF output power indication
ON AIR
Failure indication
RS-232
Dimensions 2RU (19" rack)
438 x 88 x 334mm without handles
weight 15Kg (33Lbs)

AMPLIF + EXCITER + RACK
DIMENSIONS 1 x 35RU standard 19'' racks
OUTPUT POWER 10kW
OUTPUT connector 1 5/8''