EM 4000

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EM 4000 is a 4000 W FM transmitter made up of the EM 100DIG exciter and a control unit which combines the power of two AM 2000 FM amplifiers.

The 100W FM exciter/modulator, EM 100 DIG, is controlled by microprocessor, that allow a lot of applications like power level control at night to save energy, and the whole monitoring and adjusting of several parameters of the equipment, like input level and deviation.

Each AM 2000 includes eight 300W 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.

Telemetry systems: 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 FEATURES OF THE em 4000
EM 100 DIG
AUDIO
S/N ratio (30 ~ 20000Hz) Mono: ≥78dB (86dB typical)
Stereo: ≥72dB (77dB typical)
weighted S/N (CCIR) Mono: ≥75dB (81dB typical)
Stereo: ≥68dB (72dB typical)
T.H.D. Distortion
(limiting threshold adjusted at 150kHz deviation)
75 KHz deviation <0.05% (typical 0.02%)
150 KHz deviation <0.2% (typical 0.05%)
stereo channels crosstalk (L / R) <-50dB (with external encoder)
< -60dB with internal encoder (100 ~ 5000Hz)
< -50dB with internal encoder (30 ~ 15000Hz)
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 (10Hz ~ 100KHz)
aux input (SCA/RDS) frequency response ±0.2 dB (10KHz ~ 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 or 600Ω unbalanced (selectable)
Auxiliar SCA/RDS 10KΩ
Connectors
Audio XLR Female
MPX, Auxiliar (SCA/RDS) BNC Female
common mode input rejection (20 to 15000HZ) >50dB (>60 dB typical)
MPX OUTPUT LEVEL 0 ~ +10dBm (for 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 steps 10 / 100KHz
frequency offset <±200Hz
frequency drift Thermal <250Hz from -10? to 45?C
Stability <100Hz / year
RF
RF output power 0 ~ 100WRMS adj.
MAX. reflected power allowed 10W
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 180VA (100W RF)
temperature range -10 ~ 45?C
control signals RF enable
RF output power indication
ON AIR
Failure indication
RS-232
Dimensions 3RU (19" rack)
438 x 132 x 334mm without handles
weight 11Kg (24.2Lbs)

AM 4000
FREQUENCY RANGE 87.5 ~ 108MHz
OPERATION CLASS B
INPUT RETURN LOSS <-20dB
INPUT POWER 30W
OUTPUT POWER 4kW nominal, manual and automatic adjustment (5kW max.)
typical RF efficiency 70%
cooling Forced air
harmonics level <83dBc
input / output impedance 50W
rf input connector N female
rf output connector EIA 1-5/8’’
rf monitor connector BNC female
supply -Three-phase 380Vac + Neutral; 220Vac ±10% 50/60Hz
- Three-phase triangle 220Vac without neutral ±10% 50/60Hz
CONSUMption <10000W
PROTECtions -Reflected, Forward power, overdrive, overcurrent In each 2000W module:
-Smart Temperature protection
-Reflected power protection (load mismatch):
PRFL automatic control + Fast protection
-Automatic Gain Control
-Real-time events register
-Exciter inhibition
TELEMETRY AND REMOTE CONTROL -Analog telemetry (direct and reflected power measurement)
-Telemetry and RS-232 digital remote control
-Remote control by open / closed contacts
-Multi-device bus
WORKING TEMPERATURE -5 to +40ºC
DIMENSIONS 35RU standard 19’’
WEIGHT 276Kg (607.2Lbs)

general FEATURES OF THE em 6000
DIMENSIONS 1 standard rack of 19’’ and 25
WEIGHT ~246Kg
maxIMUM height of Operating 4500m standard ( with overpressurization 6000m)
consumption <10000W,
POWER SUPPLY 380V three-phase, ±10%
operating humidity 95%
operating temperaturE -5ºC - +40ºC
MAX. OUTPUT POWER 4000W