EM 250

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The EM 250 is a 250W FM transmitter made up of the EM 25 DIG or EM20/30 exciter and the AM 250 FM amplifier. This equipment includes a high-efficiency amplifier, LPF (Low Pass Filter) and cyclical protections of: SWR, overdrive, over-consumption, over-power and temperature. The output power is externally adjustable between 0 and 250W.The EM 250 also incorporates a switching power supply that allows stable output power with input voltage from 90 to 260VAC.











technical features
AM 250
frequency range 87.5 ~ 108MHz
operating class B
input return loss 20dB
input power 2 ~ 4W
OUTPUT POWER 250W nominal
power gain 19.2dB typical
efficency 70% approx.
cooling Air forced
harmonic <-70dBc
input/output impedance 50Ω
RF input connector N Female
RF output Connector N Female
RF monitor Connector BNC Female
AC power supply 90 ~ 260VAC, 50/60 Hz, <430VA
Protections Reflected power (10% nominal power), over-consumption, temperature, power supply failure, and overdrive.
remote control and TElemetry RS-232, exciter inhibition
Dimensions 4RU (19'' rack) 465mm depth (without handles)
weight 16Kg (35.2Lbs)

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.
spurious < - 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)
EM 250: AMPLIFIER + EXCITER
CONSUMPTION 614VA
DIMENSIONS 540 x 540 x 540mm
weight 40 Kg (88lbs)
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)