1-4 888-2587-001 4/18/11
WARNING: Disconnect primary power prior to servicing.
FM HD Radio System
Section 1 Introduction/Specifications
HD1, HD2, HD3, etc. - An HD receiver in digital receive mode, and locked to the
digital signal, may display these designations for the digital channels as shown in Table
1-1 below.
The HDE-100 Exporter will merge the MPS Audio into the HD stream coming
from the HDI-100 Importer. This HD stream may contain one or more SPS audio
programs, and could also include any MPS PAD, SPS PAD, or AAS data.
High Level Combining - IBOC separate combining method that uses a 10dB hybrid
combiner (coupler) to combine the station’s analog FM transmitter with an HD-only
transmitter. With this method 10% of FM transmitter and 90% of the HD tranmisttters’
output power is dissipated in a load.
Hybrid Combiner - a combiner that operates with similar, or dissimilar input power
levels by design.
Interleaved Antennas - a low loss space-combining method that employs two antenna
inputs; one for FM and a second for the HD signal. In an interleaved antenna system the
antenna bays are alternately radiating the FM and HD signals.
Managed Ethernet Switch - A switch is a hardware device that forwards and filters
data between network segments. A Managed switch that has configurable parameters
such has Port Priority and Flow Control (setting port data rates). A managed switch is
useful for industrial systems (high noise environments). This includes where the
Ethernet traffic has multiple HD radio data sources on one segment. An example would
be an Importer, PAD source and monitor applications all competing for access to an
Exporter that is feeding an Exciter (HDx-FM Flexstar Exciter) over an STL.
MPS - Main Program Service. The stations main program audio delivered from the
station’s on-air studio. Currently required to be the identical program audio as the main
FM (audio).
Table 1-1 Multicast Channels Designations
FlexStar
System
Multicast
Receiver
FM FM
MPS HD1
SPS1 HD2
SPS2 HD3
SPS3 HD4
SPS4 HD5
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