FM Transmitter
Sistemas Electrónicos S.A EM 100 DIG
Technical Manual - v1.2 - November 2005 7
1.1 Introduction.
The OMB EM-100 DIG series transmitters are the result of experience adquired by OMB during years of
producing FM broadcast equipment, transmitters, STL and stereo encoders. These transmitters were
specifically designed to comply with the latest international standards and the requirements of
advanced broadcasters, meeting tighter specifications than usually required,at an affordable cost.
Great care went into producing a HI-FI-quality modulated signal, with low residual noise and
distortion.The RF signal is also free from spurious and harmonic components to a higher degree than
required by CCIR, European, USA and most other national standards.To obtain this outstanding
performance, OMB strongly recommend to rely on qualified personnel to install and verify the
equipment which makes up the radio station, i.e.the transmitter, the possible STL and power amplifier,
the corresponding antennas,cables and connectors.This will assure to achieve the best performance
and stability in time. To this aim, OMB especially recommend that their equipment should not be
tampered with by unskilled personnel and its after-sale service is available to customers for any
technical problem. Before proceeding to installation, please carefully read at least the general
installation part of this manual, to gain confidence with the equipment.
The EM-100 DIG transmitters are very stable and changes to the internal pre-setting other than
frequency and few other options are not usually required but, if they are, once again they must be
done by skilled personnel, fitted with proper instrumentation and service documentation. Improperly
tampering with the settings may harm the apparatus or jeopardize the guaranteed performance.
THIS EQUIPMENT COMPLIES WITH ALL RELEVANT EMI /EMC AND SAFETY REQUIREMENTS, ETSI EN300384,
ETS300447 AND EN60215 STANDARDS.
NO INTERNAL ADJUSTMENT OR PRESETTING IS REQUIRED DURING NORMAL OPERATION.EQUIPMENT SHALL
BE PROPERLY GROUNDED AND BE OPERATED WITH ALL THE COVERS CLOSED TO PREVENT ELECTRICAL
HAZARDS AND COMPLY WITH EMC STANDARDS.
A good installation,made by skilled and trained personnel will avoid many future troubles during
station's exploitation process. All the operations described in the Certification of Limited Warranty must
be accomplished to have the right of make any claim concerning this Warranty,having free
equipment service by OMB's technical personnel during this first exploitaition phase of Equipment.
1.2 General description.
The EM-100 DIG is a 100W rated, direct-synthesis, FM-modulated transmitter. Being digitally
controlled, it is extensively put on the air on field by front panel or remotely in additional aspects:
frequency, power, channel sensitivity, preemphasis, functioning mode (mono, stereo, external mpx),
clock and date and many other parameters without adjusting or substituting any part. A powerful
3-level password management permits a very high degree of security and privacy as may be
required in different situations. Equipment requires little o no maintenance and its simple modular
layout facilitates stage testing and servicing.
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