21
Front panel display
© 2016 ITEL Elettronica e Telecominicazioni Snc
2.5.2
Output level setup
Audio level:
percentage of audio signal (L+R, L-R) into the composite MPX signal.
In case of monoaural broadcasting, without RDS and pilot subcarrier, this level can be left at 100%,
and this will produce a deviation of 75KHz.
In all other cases it should be reduced according to the level of injection of the two subcarriers,
otherwise overmodulation will occur.
For example, if a RDS subcarrier of 2KHz and a pilot tone of 6KHz are desired, the audio signal level
can not be greater than
100*(1- ((PilotCarrierDeRDSCarrierDeviation)/75))
which, for the example described above, will correspond to:
100*(1- ((6+2)/75))=89.3%
Composite level:
MPX output level.
Test tone (!):
when activated, will put on air a 400Hz tone, having an amplitude equal to 100%
modulation.
If RDS and pilot subcarriers were correctly set, the final modulation will not go above this limit.
Содержание DPRO3
Страница 4: ...Section 1 Description ...
Страница 9: ...Section 2 Front panel display ...
Страница 25: ...Section 3 Programmming software ...
Страница 43: ...Section 4 RD Link ...
Страница 57: ...Section 5 Streaming audio module ...