65 Aleksandar Stamboliyski Str., 8000 Bourgas, Bulgaria
Tel: +359 56 820027, Fax: +359 56 836700
E-mail: [email protected] ,Web: www.devabroadcast.com
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RE-BROADCAST SETTINGS
The Stereo MPX is signal used for FM Stereo broadcasting and represents a complex combination
of the following signals:
- Sum of the left and right audio channels occupying the band from 0 to 15kHz;
- Difference signal (Left minus Right) located in the band 23-53kHz;
- Pilot tone at exactly 19 kHz;
- RDS signal, used for transmitting text and other data, may also be added. It occupies a narrow
band around 57kHz;
The amount of each signal contained in the final MPX signal is called injection level.
DB7000 has a built-in stereo generator and Radio Data Systems (RDS/RBDS) encoder.
MPX out Configuration
There are three types of MPX signal that you can choose from:
1. RAW MPX - Directly modulated by your station RAW MPX without any further processing;
2. Stereo & RDS Gen - Generated by the internal stereo and RDS generators;
3. Calibration Tone 400Hz – used to adjust the transmitter MPX input.
The MPX signal can be configured through the front panel navigational menu:
Settings> MPX> MPX Source
Stereo Generator
The composite multiplex signal, including the pilot tone, is generated through the build-in
Stereo generator. The Stereo generator can operate in two modes - Stereo and Mono. In order to
overcome the noise of the treble frequencies the Emphasis can be set to Flat, 50µs or 70µs.
Injection levels
The MPX signal is a combination of
Audio
,
Pilot
and
RDS
Signal. This option allows you to
adjust the amount of each signal included in the
MPX
. The recommended and default values are:
0dB Audio gain, 7.5kHz Pilot and 5kHz RDS.
Содержание DB7000
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