EM 1000

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The EM 1000 is a 1000W FM transmitter made up of the EM 25 DIG exciter (or EM 20/30 exciter) and the AM 1000 FM amplifier. This equipment includes 3 amplyfing modules designed with state of the art MOSFET technology. It includes an elliptic LPF (Low Pass Filter) with high-attenuation in the harmonic frequencies and digital telemetry output in order to get information about internal parametres of the amplifier. The most relevant parameters can be visualized in the LCD display: Forward and Reflected power, overdrive, group 1 current, group 2 current, power supply voltage, SWR and temperature alarms. The 3 independent amplyfing modules are combined and mounted on a high-performance heat-sink, so that the transistors work in optimal thermal conditions even in really hot enviroments.





Technical features
AM 1000
frequency range 87.5 ~ 108MHz
operating class B
input return loss >20dB
input power 10 ~ 15W
OUTPUT POWER 1000W nominal adj.
POwer gain 19.2dB typical
Efficiency 70% approx.
cooling Air forced
harmonics -76.5dBc
input/output impedance 50Ω
RF input connector N Female
RF output connector 7/8 DIN (7/16 optional)
RF monitor connector BNC Female
AC power supply 115/230 VAC ±15%, <1700VA
ProtecTions Reflected power, over-consumption, temperature, power supply failure, overdrive, direct and reflected foldback.
REMOTE CONTROL AND tELEMETRY RS-232, exciter inhibition
operating temperature -5 to +40 ºC (recommended)
-10 to 50 ºC (maximum)
Dimensions 3RU (19’’rack)
weight 22kg.

EM 25 DIG
S/N RATIO BETWEEN 30Hz AND 15kHz > 78dB, typical 86dB.
S/N RATIO (AM ASYNCHRONOUS) > 55dB, typical >60dB.
S/N RATIO (AM SYNCHRONOUS) > 50dB, typical >55dB.
HARMONICS DISTORTION (75KHz deviaTion) < 0.05%, typical 0.02%.
HARMONICS DISTORTION (150KHz deviaTion) < 0.2%, typical 0.05%.
L/R STEREO CHANNELS CROSSTALK < -50dB (with external coder)
<-60dB (with internal coder, from 100Hz to 5kHz)
<-50dB (with internal coder, from 30Hz to 15kHz)
FREQUENCY RESPONSE (PROGRAM CHANNEL) ± 0.1dB (30Hz ~15kHz)
AUDIO FILTER BAND ATTENUATION > 50dB (f =19KHz)
BASE BAND LIMITER CUT Adjustable between 0 and +7dBm.
FREQUENCY RESPONSE (Multiplex INPUT) ±0.1dB (10Hz ~ 100KHz)
FREQUENCY RESPONSE (AUX CHANNEL INPUT) ±0.2dB (10Hz ~ 100KHz)
FREQUENCY RANGE 87.5 ~ 108MHz
MODULATION TYPE FM, ±75KHz dev. peak. F3E, F8E.
CHANNEL OSCILLATOR SYNTHESIZER STEPS 10KHz
RF OUTPUT POWER Adjustable between 1 and 25WRMS
HARMONICS LEVEL < -60dBc, typical -70dBc.
SPURIOUS LEVEL < -80dBc, typical -95dBc.
RF OUTPUT IMPEDANCE 50Ω asymmetrical.
RF OUTPUT CONNECTOR N female
Audio/Multiplex INPUT IMPEDANCE Selectable 10KΩ / 600Ω, sym./asym.
AUDIO INPUT CONNECTOR XLR Female symmetrical
SCA/RDS INPUT IMPEDANCE 10KΩ asymmetrical
SCA/RDS INPUT CONNECTOR BNC Female
Audio/Mpx INPUT LEVEl at ?75KHz dev. Adjustable between -3.5 and +12.5dBm.
SCA/RDS INPUT LEVEL at ?7.5KHz dev. Adjustable between -12.5 and +3.5dBm.
SCA/RDS INPUT LEVEL at ?2.0KHz dev. Adjustable between -24 and -8dBm.
MODULATION OUTPUT LEVEL 0 ~ +10dBm (for ±75KHz dev.)
PRE-EMPHASIS TIME CONSTANT Variable 0 / 50 / 75µs ± 2%
POWER SUPPLY 115 / 230VAC ± 15%, 50/60Hz.
ConsumPTION (aT 25W OUTPUT RF POWER) 130VA / 75W.
OPERATING TEMPERATURE RANGE -10 ~ +45ºC.
Dimensions 2RU 19'' standard rack (483 x 88 x 334 mm)
WEIGHT 6Kg (13.2lbs)

EM 20-30
frequency range 87.5 ~ 108.0MHz
Modulaci?n Frequency ( ± 75KHz deviation)
modulation CLASS F3E, F8E
VCO tuning range 25MHz
frequency stability ± 2.0ppm
ferquency tuning step 10KHz
RF output power 0 ~ 30Wrms adj.
espurious < - 80dBc
harmonics < - 70dBc
stereo channel separation > 55dB / 1KHz
T.H.D. Distortion < 0.1% / 1KHz (0.08% typical)
baseband frequency response 0.15dB from 30Hz to 60KHz
unweighted S/N ratio >78dB from 30Hz to 15KHz. MONO input; 50ms pre-emphasis
asynchronous AM S/N ratio >65dB (ref.100% 400Hz)
synchronous AM S/N ratio >60dB (75 KHz dev. and 400Hz)
Pre-enphasis 50 or 75ms internally selectable
RF output impedance 50W asymmetrical (N Female Connector)
audio/stereo input connector BNC Female
audio/stereo input impedance High-Z. 2KW
SCA channel input connectors BNC Female
SCA channel input impedance High- Z. 2KW
remote control interface serial RS-232
cooling Air forced (axial blower)
operating temperature range - 10 ~ + 45ºC
maximum relativa humidity 90% (without condensation)
AC power supply 110/240VAC, 47/63Hz
Dimensions 2RU (19" rack) 410mm depth
weight 4.8 Kg (10.56lbs)