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VS300 Operations and Maintenance Manual
Operating the transmitter
Issue 8.0 2016-03-01
Page 2-57
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Mode:
Set the overall transmission mode. Available options are:
– FM: an analogue only mode, transmits a carrier, frequency modulated with audio.
– HD: all digital mode; this mode transmits the upper and lower digital sidebands of
OFDM IBOC carriers. HD transmitter is typically high-level combined (coupler or
spatial) with a paired FM only transmitter. See page
for additional calibration
settings. This mode requires additional hardware.
– FM+HD: also known as hybrid/simulcast or low-level combined, this mode transmits
the analog carrier (FM modulated) and the upper and lower digital sidebands of OFDM
IBOC carriers. See page
for additional calibration settings. This mode requires
additional hardware.
– DRM+: transmits a DRM OFDM signal using the I/Q stream from a DRM modulator
connected to the desired AES input. See page
for additional calibration settings.
This mode requires additional hardware.
Mode - additional calibration settings:
– IBOC Injection (Lower): for FM+HD and HD modes, enter value, in dB, between -20
and -10 dB for the IBOC injection level of the lower sideband of digital carriers. This
value determines the relationship between the digital carriers power and the analog
carrier power. Example: -20 dB indicates that the total RMS power of the digital carriers
will be 1/100 of the total RMS power of the analog carrier. -10 dB indicates that the total
RMS power of the digital carriers will be 1/10 of the total RMS power of the analog
carrier.
– IBOC Injection (Upper): for FM+HD and HD modes, enter value, in dB, between -20
and -10 dB for the IBOC injection level of the lower sideband of digital carriers. This
value determines the relationship between the digital carriers power and the analog
carrier power. Example: -20 dB indicates that the total RMS power of the digital carriers
will be 1/100 of the total RMS power of the analog carrier. -10 dB indicates that the total
RMS power of the digital carriers will be 1/10 of the total RMS power of the analog
carrier.
Note:
Settings on the Presets tabs are shown/hidden based on the chosen settings. Not all settings are
available in all modes.
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