FM Transmitter
Sistemas Electrónicos S.A EM 250 COMPACT DIG
Technical Manual - v1.1 - February 2006 11
1.4 Rear panel.
All transmitter inputs and outputs are allocated on the rear panel. Figure 1-3 below shows this Panel
indicating all connectors and elements.
Fig. 1-3: REAR VIEW OF TRANSMITTER CABINET.
These elements are numbered as follows:
1 -Mains IEC ON/OFF switch, mains voltage selector,socket and fuses block. Please note that the
transmitter is usually factory pre-set for 220-240V
AC
nominal Mains voltage.
2 -Main Power Supply's hot air exhaust from internal cooling blower.
3 - RF Power Module's hot air exhaust from cooling fan.
4 -Output RF connector.Type "N"female.
5 - Remote operation DB-9 male connector.
6 - RS-232 serial interface connector. This RS-232 port manages only Tx, Rx and Return data
signals,with no handshake. Being the two former wired signals inverted to the port, it needs a simple
straight wired serial cable with appropriate connectors:usually a female DB-9 or DB-25 female to
the PC port and a male DB9 connector at the transmitter end. Appropriate OMB software is
required for communication. Do not connect the serial cable with neither transmitter or PC turned
on.
7 - RF sample output for frequency measuring or RF signal monitoring, BNC female type connector.
-50dBc.
8 - Right and left channels audio input XLR balanced female connector. For using internal stereo
coder. (See equipment's rear panel for pin connections).
9 - MPX input connector. Type BNC female.For use in pre-coded stereo multiplex signal input. Flat
response from10Hz to 100KHz to feed stereo multiplex signal. Hi - Z unbalanced input (10K:).
10.- AUX connector. Unbalanced Hi-Z BNC female connector,to feed a RDS or SCA encoder output
signal.
11.-LF MONITOR output connector. Baseband modulation output for monitoring, re-broadcasting or
RDS external synchronization. BNC female type, unbalanced Hi-Z (10K:).
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