User's Manual

APEX™ Exciter Incorporating FLO™ Technology
Organization of Technical Manual Introduction
2604s100.fm
03/08/07 888-2604-001 Page: 1-1
WARNING: Disconnect primary power prior to servicing.
1Introduction
This technical manual contains installation, operating and maintenance procedures for the
HARRIS APEX Exciter incorporating FLO
TM
technology
1
.
1.1 Organization of Technical Manual
The manual is divided into these sections:
• Section 1 - Introduction, describes the APEX exciter and lists the sections of this
technical manual.
• Section 2 - Installation, describes the mounting, environmental requirements and ini-
tial setup of the exciter.
• Section 3 - Navigating the LCD Display Screens, explains how to operate the exciter.
• Section 4 - APEX Exciter Theory, explains the functioning of each part of the exciter
as an aid to servicing the product.
• Section 5 - Maintenance and Troubleshooting, describes checks and test which may
be used to isolate a suspected problem in the exciter.
• Section 6 - Parts List, is an indexed listing of field-replaceable parts for the APEX ex-
citer.
1.2 General Description
This APEX exciter s a low power transmitter signal source for the FLO technology
It receives the program material to be transmitted in the form of the ASI transport stream
and generates a low-level on-channel RF signal. It performs pre-corrections for signal
distortions which occur in the transmitter RF power amplifiers, high power filter, and
transmission line.
This APEX exciter
incorporating FLO™ Technology is presently installed in the Harris
Ranger and Atlas Mobile transmitters, and can also be used as a stand alone signal source
for testing purposes.
FLO technology was designed for distribution of multimedia material. It uses orthogonal
frequency division multiplexing (OFDM). It achieves high spectral efficiency while
meeting mobility requirements (it can be received at speeds up to 200 km/hour) in a large
cell SFN (single frequency network). The FLO physical layer uses a 4K mode (yielding a
transform size of 4096 sub-carriers). The individual sub-carriers are modulated by QPSK
(quadrature phase shift keying)
or 16-QAM (quadrature amplitude modulation).
OFDM modulation is also used by Digital Audio Broadcasting (DAB)
2
, Terrestrial Digital
Video Broadcasting (DVB-T)
3
, and Terrestrial Integrated Services Digital Broadcasting
(ISDB-T)
4
.
1. FLO is a trademark of QUALCOMM Inc.
2. Digital Audio Broadcasting (DAB) system also referred to as Eureka 147 and defined in ETSI EN 300
401: “Digital Audio Broadcasting (DAB); DAB to mobile, portable and fixed receivers.”
3. Terrestrial Digital Video Broadcasting (DVB-T) as defined in ETSI EN 300 744: “Digital Video Broad-
casting (DVB); Framing structure, channel coding and modulation for digital terrestrial television.”
4. ISDB family includes System C of Recommendation ITU-R BT.1306, System F of Recommendation
ITU-R BS.1114 and IDSB-S of Recommendation ITU-R BO.1408