FM Transmitter
Sistemas Electrónicos S.A EM 100 DIG
Technical Manual - v1.2 - November 2005 19
2.4 Operation
2.4.1 Monaural Broadcasting,from a Monophonic Audio
Source through Main Monaural Channel.
1) Connect the “right ”(or mono) input connector to the corresponding audio source as described in
the "system connection" section. No connection to the "left" channel input is needed. The signal runs
through the channel processor and is 15kHz filtered and pre-emphasized.
2) Select the <MODE> command menu screen (cf relevant section on the manual) and select
<MONO> operating mode. Confirm or change also 50 or 75µs preemphasis as required.
2.4.2 Monaural Broadcasting, from a Stereophonic Audio
Source through the Optional Internal Stereo Encoder.
1) Connect both the <LEFT>and <RIGHT> input connector to the corresponding audio source as
required for stereo transmission as described above. The audio signals will run through the channel
processors and will be 15kHz filtered and pre-emphasized. The internal stereo-encoder will blend the
stereo input source to transmit in monaural mode. In this case the transmitter is already preset for
stereo operation if needed, simply reversing transmission mode to <STEREO>.
2) Select the <MODE> command menu screen and select <MONO L+R> operating
mode.Confirm or change also 50 or 75µs preemphasis as required.
2.4.3 Mono or Stereo Broadcasting from a Radio-Link
Receiver or an External Encoder.
1) In this case, the signal is already multiplexed and pre-emphasized. Use the <MPX> BNC input
connector. The signal skips the coding and filtering stage and therefore is not pre-emphasized.
2) Select the <MODE> command menu screen and select <EXT MPX> operating mode. While it is
anyway advisable to select the proper preemphasis time-constant as required for your country, in this
position this selection is not influent.
2.4.4 Stereo Broadcasting from a Stereophonic Audio
Source through the Optional Internal Stereo Encoder.
1) Connect the XLR-type modulation input connectors, marked <LEFT> (channel) and <RIGHT>
(channel), to the output of the two channels from the mixer console or stereo source. They will be
internally 15kHz filtered and pre-emphasized.
2) Select the <MODE> command menu screen and select <STEREO> operating mode. Confirm or
change 50 or 75µs preemphasis as required.
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