RF Central RFX-PHT User manual

Portable High-Powered Transmitter (RFX-PHT)
OPERATORS MANUAL
Copyright 2005 RF Central
RFX-PHT LAST REV: 13 Dec 2006 Page 1 of 30

CONTENTS
1GENERAL SAFETY INFORMATION...............................................................................4
1.1 Health & Safety ......................................................................................................5
1.2 Maximum RF Power Density Limits........................................................................6
2INTRODUCTION.............................................................................................................7
2.1 GENERAL DESCRIPTION.....................................................................................7
2.2 RFX-CMT DESCRIPTION......................................................................................9
3ACCESSORIES / OPTIONS..........................................................................................12
3.1 Vehicle Installation Kit ..........................................................................................12
3.2 Antenna Options...................................................................................................13
4SPECIFICATIONS.........................................................................................................14
5SYSTEM OPERATION..................................................................................................15
5.1 Camera Interfaces................................................................................................15
5.2 Operator Controls / Menus...................................................................................15
5.3 Initialization Menu.................................................................................................15
5.4 Main Menu............................................................................................................15
5.5 Ch / Frequency Menu...........................................................................................18
5.6 Encoder Menu......................................................................................................18
5.7 Audio 1 Menu.......................................................................................................18
5.8 Audio 2 Menu.......................................................................................................18
5.9 Status Menu.........................................................................................................19
5.10 Status Monitoring .................................................................................................19
5.11 System Configuration – Engineering Menu..........................................................19
5.11.1 Prog Channels..............................................................................................19
5.11.2 FW Inventory................................................................................................20
5.11.3 Video Input/Video Format.............................................................................20
5.11.4 Audio Input...................................................................................................20
5.11.5 Temperature.................................................................................................20
6PREPARING FOR OPERATION...................................................................................21
6.1 EQUIPMENT PREPARATION .............................................................................21
6.1.1 Preparing Portable High Power Kit (PHT) ....................................................21
6.1.2 Preparing Camera-Mount Configuration (CMT)............................................21
6.1.3 The Receiving Equipment ............................................................................22
7Connector Pin Outs .......................................................................................................23
7.1 SDI / CVBS Video BNC........................................................................................23
7.2 Video Connector...................................................................................................23
7.3 Audio Connector...................................................................................................23
7.4 Power Connector..................................................................................................23
7.5 Remote Connector ...............................................................................................24
8Module Descriptions ......................................................................................................25
8.1 Block diagram.......................................................................................................25
8.2 Audio / Video Encoder..........................................................................................26
8.3 COFDM Modulator ...............................................................................................27
Power Amplifier..............................................................................................................27
8.4 Front Panel...........................................................................................................28
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9Appendix A: MPEG Encoder Parameter Sets...............................................................29
10Appendix B: Table of DVB-T non-hierarchical bit rates..................................................30
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1 GENERAL SAFETY INFORMATION
The information that follows, together with local site regulations, should be studied by
personnel concerned with the operation or maintenance of the equipment, to ensure
awareness of potential hazards.
WARNING- RF Power Hazard: High levels of RF power are present in the unit. Exposure to
RF or microwave power can cause burns and may be harmful to health.
Switch off supplies before removing covers or disconnecting any RF cables, and before
inspecting damaged cables or antennas.
Avoid standing in front of high gain antennas (such as a dish) and never look into the open
end of a waveguide or cable where RF power may be present.
Users are strongly recommended to return any equipment that requires RF servicing to RF
Central.
WARNING- GaAs / BeO Hazard: Certain components inside the equipment contain Gallium
Arsenide and Beryllium Oxide that are toxic substances. Whilst safe to handle under normal
circumstances, individual components must not be cut, broken apart, incinerated or
chemically processed. In the case of Beryllium Oxide, a white ceramic material, the principal
hazard is from the dust or fumes, which are carcinogenic if ingested, inhaled or entering
damaged skin.
Please consult your local authority before disposing of these components.
CAUTION- Tantalum Capacitors: When subjected to reverse or excess forward voltage,
ripple current or temperature these components may rupture and could potentially cause
personal injury.
CAUTION: This system contains MOS devices. Electro-Static Discharge (ESD) precautions
should be employed to prevent accidental damage.
The information contained in this manual remains the property of RF Central and may not be used, disclosed, or reproduced
in any other form without the prior written permission of RF Central.
RF Central reserves the right to alter the equipment and specification appertaining to the equipment described in this manual
without notification.
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1.1 Health & Safety
Exposure to Non Ionizing (RF) Radiation/Safe Working Distances
The safe working distance from a transmitting antenna may be calculated from the
relationship:
D = √ PT. GR
4π.w
In which D = safe working distance (meters)
PT = transmitter or combiner power output (watts)
GR = antenna gain ratio = anti log (gain dBi ÷10)
w = power density (watts/square meter)
The RF power density value is determined by reference to safety guidelines for exposure of
the human body to non-ionizing radiation. It is important to note that the guidelines adopted
differ throughout the world and are from time-to-time re-issued with revised guidelines. For
RF Central use, a maximum power density limit of 1w/m² is to be applied when calculating
minimum safe working distances. Appendix A refers.
Important Note: It must be remembered that any transmitting equipment radiating power at
frequencies of 100 KHz and higher, has the potential to produce thermal and athermal effects
upon the human body.
To be safe:
a) Operators should not stand or walk in front of any antenna, nor should they allow
anyone else to do so.
b) Operators should not operate any RF transmitter or power amplifier with any of its
covers removed, nor should they allow anyone else to do so.
Worked examples
Antenna Transmitter Power
Type Gain (dBi) Gain Ratio 2W 4W 10W 30W
OMNI 4 2.5 1 1 1.5 2.5
HELIX 20 100 4 5.6 9 15.5
PARABOLIC
DISH 35 3,162 22.5 32 50 87
MINIMUM SAFE DISTANCE (METERS)
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1.2 Maximum RF Power Density Limits
The RF Radiation Power Density limit figure recommended by RF Central is based upon
guideline levels published in:
a. IEEE standard C95.1 1999 - IEEE Standard for Safety Levels with respect to Human
Exposure to Radio Frequency Electromagnetic Fields, 3 kHz to 300 GHz.
b. Guidelines for Limiting Exposure to Time-varying Electric, Magnetic & Electromagnetic
Fields (up to 300 GHz) published in 1998 by the Secretariat of the International Commission
on Non-Ionizing Radiation Protection (ICNIRP).
Both documents define guideline RF power density limits for "Controlled" and "Uncontrolled"
environments. An uncontrolled environment is defined as one in which the person subjected
to the RF radiation may be unaware of and has no control over the radiation energy received.
The uncontrolled environment conditions can arise, even in the best regulated operations and
for this reason the limits defined for the uncontrolled environment have been assumed for the
RF Central recommended limit.
Documents a) and b) also show the RF power density guidelines to be frequency dependent.
Different power density / frequency characteristics are presented in the two documents. To
avoid complexity and to avoid areas of uncertainty, RF Central recommends the use of a
single power density limit across the frequency range 100 kHz to 300 GHz. The 1w/m² power
density limit we recommend satisfies the most stringent of the guidelines published to date.
Footnote: The IICNIRP document may be freely downloaded from the internet at
www.icnirp.de/documents/emfgdl.pdf (PDF file)
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2 INTRODUCTION
2.1 GENERAL DESCRIPTION
Designed to utilize the RFX-CMT, the RFX-PHT portable 2 GHz digital transmitter comes with
either 5 or 10 watt max. power output. It provides a means to make any “news car” into a “live
car”. “Run and shoot” vehicles now become “run and transmit” The PHT can also be used in a
standalone mode for temporary transmit application. RF Central warranties the PHT for 3
Years.
This manual is to be used in conjunction with the RFX-PHT unit, which is composed of two
major components; the RFX-CMT and the Amplifier case.
Various optional accessories are available for the PHT described in detail in paragraph 2.3.
(fig. 2-1) – PHT Case (top view) (fig. 2-2) – PHT Case (standing)
(fig. 2-3) – PHT Case (opened with CMT installed) (fig. 2-4) – PHT Case (opened with CMT unclipped)
RFX-PHT LAST REV: 13 Dec 2006 Page 7 of 30

(fig. 2-5)
(fig. 2-6) (fig. 2-7)
(fig. 2-8) (fig. 2-9)
Remote Control
Amplifier Output
(to antenna)
Video In Audio #1 Inpu
t
Audio #2 Inpu
t
Power In
(12 VDC at 12.5 Amps)
Transmitter-to-Amplifier
Jumper
RFX-PHT
Control Panel
(Yellow LED)
(Red LED)
(Green LED)
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2.2 RFX-CMT DESCRIPTION
The core transmission component of the RFX-PHT is the RFX-CMT.
The RFX-CMT Wireless Camera system is designed for all applications, both indoor and
outdoor, in which a mobile camera is essential to the televised program production. The
RFX-CMT simply clips onto the battery adapter plate, transforming a standard news gathering
camera into a wireless camera.
The CMT system is comprised of the transmitter that contains an audio encoder, video
encoder, COFDM modulator, power supplies and an RF power amplifier. In its CMT
configuration, it is attached directly to a camera with an omni-directional antenna (see
diagram 2-1 & 2-2).
CMT Inputs
(fig. 2-10) (fig. 2-11)
Audio In
(connected)
Audio In Alternative Power
Supply In
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(fig. 2-12) (fig. 2-13)
SDI/CVBS Input cable
connected
Switchable
Component / Composite
Video
Switchable SDI/CVBS
Input
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