Sangean HDT-1 User Manual page 14

Receiving HD radio stations
When the radio is tuned to a station broadcasting HD radio signal,
the LCD will display a blinking "HD "logo. Once the tuner acquires the
HD radio signal, the "HD" logo will stay on and a Signal Strength
indication will appear in the top right hand corner.
Receiving Multicast Stations
When the radio is tuned to an HD radio compatible station and it
determines that one or more Multicast stations are available,
the Frequency or the Call Letters will be followed by a "-1" designator,
indicating that there is at least one Multicast station available.
The TUNE UP button will tune up from a station's Main Program Service
Station to the Multicasting programs.
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