FM Transmitter
Sistemas Electrónicos S.A EM 250 COMPACT DIG
Technical Manual - v1.1 - February 2006
13
1.6 Technical specifications.
SIGNAL TO NOISE RATIO
Monaural >78dB, typical 86dB (from 30 to 20,000Hz)
Stereophonic >72dB, typical 77dB (from 30 to
20,000Hz)
CCIR WEIGHTED S/N
Monaural >75dB, typical 81dB.
Stereophonic >68dB, typical 77dB.
HARMONIC DISTORTION
NOTE:LIMITER SET TO 150KHZ DEVIATION
THRESHOLD.
For ± 75 KHz dev <0.05%, typical 0.02%
For ±150 KHz dev <0.2%, typical 0.05%
STEREO CROSSTALK
w/External Encoder <-50dB.
w/Internal Encoder (from 100 to 5000Hz) <-60dB
w/Internal Encoder (from 30 to 15000Hz) <-50dB
PROGRAM AUDIO CHANNEL FREQUENCY
RESPONSE FROM 30 TO 15000HZ
± 0.1dB
ATTENUATION AT AUDIO FILTER REJECTION
BAND (F =19KHZ)
>50dB
DEVIATION LIMITER THRESHOLD
Adjustable between 0 and +7dBm
STEREO MULTIPLEX INPUT FREQUENCY
RESPONSE.FROM 10HZ TO 100KHZ
±0.1 dB
AUXILIARY INPUT FREQUENCY RESPONSE
.FROM 10 TO 100KHZ
±0.2 dB
MAINS SUPPLY REQUIREMENTS
90 ~ 260V
AC
, 50/60 Hz
POWER CONSUMPTION AT 250W RF OUTPUT
LEVEL
600 VA / 480W
OPERATING TEMPERATURES RANGE
0 to +35 ºC recomm.
-10 to +45 º C max
MOUNTING DIMENSIONS (W/O HANDLES)
Width:19" Height: 3RU in standard 19" Rack.
DIMENSIONS
483mm width x 125mm height x 334mm depth
MODULATION
Frequency, ± 75KHz. peak dev
MODULATION CLASS
F3E, F8E
OSCILLATOR'S SYNTHESIS STEPS
10 /100KHz
FREQUENCY ERROR
<± 200Hz
FREQUENCY DRIFT
<250Hz, over temperature <100Hz/year
RF OUTPUT POWER
Adjustable between 2 and 250W
RMS
nominal
MAXIMUM ALLOWABLE REFLECTED RF POWER
25W
RF HARMONIC PRODUCTS
< -70dBc
RF SPURIOUS PRODUCTS
<-80dBc.typical -95dBc
RF OUTPUT IMPEDANCE
50
:
unbalanced. N Female connector
AUDIO /MULTIPLEX INPUT LEVEL
Adjustable between -3.5 and +12.5dBm for ±75KHz
peak dev
AUDIO /MULTIPLEX INPUT IMPEDANCE
Select.10K
:
/600
:
, bal./unbal
COMMON MODE INPUT REJECTION FROM
20 TO 15000HZ
>50dB, typical >60 dB
AUDIO INPUT CONNECTORS
XLR Female balanced
SCA/RDS CHANNEL INPUT LEVEL
±7.5KHz dev: adjustable between -12.5 to +3.5dBm.
±2.0KHz dev: adjustable between -24 and -8dBm.
SCA/RDS CHANNEL INPUT IMPEDANCE
10 K
:
unbal.BNC Female connector
MODULATION OUTPUT LEVEL
From 0 to +10dBm at ±75KHz peak dev
PRE-EMPHASIS TIME CONSTANT
Variable: 0 /50 /75 µs ± 2%
