Microwave Radio Communications LLC PTX127T1CG Manuel D’Utilisation
8
Theory of Operation
8-1
PTX-PRO User and Technical Manual
Theory of Operation
8.1
Chapter Overview
This chapter provides technical details about the design and
functioning of the PTX-PRO 13 GHz Transmitter (PTX-PRO).
This chapter is intended to complement information contained in
the
functioning of the PTX-PRO 13 GHz Transmitter (PTX-PRO).
This chapter is intended to complement information contained in
the
.
The descriptions in this chapter assume you are already familiar
with the information contained in Chapter 2. We recommend
that you review Chapter 2 before beginning to read this one.
with the information contained in Chapter 2. We recommend
that you review Chapter 2 before beginning to read this one.
Here are the topics covered:
8.2
System Architecture
The PTX-PRO is designed around a flexible, modular
architecture. The overall PTX-PRO system architecture for a
PTX-PRO is shown in
architecture. The overall PTX-PRO system architecture for a
PTX-PRO is shown in
The PTX-PRO is a versatile portable transmitter designed to
accept an IF 70 MHz input signal or composite video signal,
audio signals, or SD/HD SDI signals or ASI/SDI signals from
external sources and to provide a 13 GHz microwave signal
output.
accept an IF 70 MHz input signal or composite video signal,
audio signals, or SD/HD SDI signals or ASI/SDI signals from
external sources and to provide a 13 GHz microwave signal
output.
Topic
Page
Figure 8-1: PTX-PRO System Architecture
All configurations are available with either NTSC or PAL system
modulation.
modulation.
PTX-PRO key features are:
•
RF output high/low power selection for 13 GHz operation
•
System modulation scheme:
Digital: COFDM or LMS-T
•
COFDM Modulation:
Selectable 6, 7, or 8 MHz bandwidth
QPSK, 16 QAM, or 64 QAM
QPSK, 16 QAM, or 64 QAM
•
COFDM Modulation with selectable Guard Interval
technology (1/4, 1/8, 1/16/ or 1/32)
technology (1/4, 1/8, 1/16/ or 1/32)
•
Forward Error Correction (FEC) (1/2, 3/5, 5/6, or 7/8)
•
MPEG encoding with SD and optional HD video solution
technologies
technologies
•
Front panel local control
•
Wide choice of antennas.
P T X - P R O
T X S y s t e m
R S - 2 3 2
1 2 0 / 2 4 0 V A C , 5 0 / 6 0
H z o r + 1 1 . 0 t o + 3 6 . 0
V D C
A U D I O /
A E S / E B U
R F O U T
M O N I T O R
S D I / S D /
H D
S D I / A S I
I N P U T
S I G N A L
I N P U T