EM 250 COMPACT DIG

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The EM 250 COMPACT DIG is a 250W FM transmitter, microprocessor controlled, that allows a lot of applications like power level control at nights to save energy, and the complete monitoring and adjusting of several parameters of the equipment (input level, deviation, etc.). EM 250 COMPACT DIG includes a 300 high-efficiency amplifier and a restrictive 7-order filter. The switching power supply allows stable output power with input voltage from 90 to 260VAC. EM 250 COMPACT DIG can be supplied with an internal digital stereo generator board (60dB separation).

TECHNICAL FEATURES
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 and 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 87.6 ~ 107.9MHz
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 431,03VA (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)