Radio Shack 12-1686 - Manual (Page 11)

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and FM2) for a total of 24.
Beyond the Basics
Multicast Channels
In addition to digital sound quality, HD Radio broadcasters can offer multiple
programming channels simultaneously using their existing frequency on the
radio dial. These additional channels can offer expanded news, talk, and music
formats.
When your radio tunes in the HD channel, if a number appears on the right
side of the station frequency (for example: 89.3-1), this indicates the existence
of multicast services. Use the TUNE - / + to select a multicast channel for the
frequency.
System Delay
Digital systems inherently produce an audio delay. To overcome this delay,
HD Radio uses a station’s analog signal to enable fast tuning of an AM or
FM station. After approximately 5 seconds, the audio from the analog signal
changes to digital HD Radio. If the radio station has implemented the HD Radio
broadcast correctly, the blend is smooth. However, if the station has not, you will
experience a skip in content of up to 5 seconds for a -2 or higher channel.
This is not an issue with your HD Radio. This is an HD Radio broadcaster’s
implementation issue, which should be corrected by the station over time.
Today’s analog is only present on the main channel. Should you tune directly to
a station’s multicast channel, the HD Radio Tabletop will delay playing audio or
content for up to 5 seconds. This is normal operation.