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EM 25 Dig. F.M. Transmitter
EM 25 dig1

An FM transmitter (87.6 ~ 107.9 MHz) externally synthesized in steps of 10 KHz, microprocessor controlled and LCD display for the visualisation of the most relevant transmission parameters like:

frequency,

Modulation level

Forward and reflected power

Pre-emphasis

Aux.

L, R,

MPX.

It includes fold-back protection and telemetry output, and it is possible temporising and tuning the output power from 0 to 25W. EM 25 DIG can be supplied with an internal digital stereo generator board (60dB separation).
Technical

S/N RATIO BETWEEN 30 Hz AND 15 Khz 

> 78dB, typical 86dB

S/N RATIO (AM ASYNCHRONOUS)

> 55dB, typical >60dB

S/N RATIO (AM SYNCHRONOUS) 

> 50dB, typical >55dB

HARMONICS DISTORTION  (75 KHz dev.) 

< 0.05%, typical 0.02%

HARMONICS DISTORTION  (150 KHz dev.) 

< 0.2%, typical 0.05%

L/R STEREO CHANNELS CROSSTALK

< -50dB (with external coder)

<-60dB (with internal coder, from 100 Hz to 5 Khz)

<-50dB (with internal coder, from 30 Hz to 15 Khz)

FREQUENCY RESPONSE (PROGRAM CHANNEL) 

±  0.1dB  (30 Hz ~15kHz)

AUDIO FILTER BAND ATTENUATION 

> 50dB  (f =19KHz)

BASE BAND LIMITER CUT 

Adjustable between 0 and +7dBm

FREQUENCY RESPONSE (Multiplex INPUT) 

± 0.1dB  (10 Hz ~ 100 KHz)

FREQUENCY RESPONSE (AUX CHANNEL INPUT) 

± 0.2dB  (10 Hz  ~ 100 KHz)

FREQUENCY RANGE 

87.6 ~ 107.9MHz

MODULATION TYPE 

FM, ± 75 KHz dev. peak. F3E, F8E.

CHANNEL OSCILLATOR SYNTHESIZER STEPS 

10 KHz

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 ?75 KHz 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. peak)

PRE-EMPHASIS TIME CONSTANT 

Variable 0 / 50 / 75ms ± 2%

POWER SUPPLY 

115 / 230 VAC ±15%, 50/60 Hz

Consumption (at 25W OUTPUT RF POWER) 

130 VA / 75W

OPERATING TEMPERATURE RANGE 

-10 ~ +45?C

Dimensions 

2 RU 19'' standard rack (483 x 88 x 334 mm)

WEIGHT

6 Kg (13.2lbs)

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