Portable High-Powered Transmitter (RFX-PHT) OPERATORS MANUAL Copyright 2006 RF Central RFX-PHT/CMT Issue 1.
CONTENTS 1 GENERAL SAFETY INFORMATION...............................................................................4 1.1 Health & Safety ......................................................................................................5 1.1 Maximum RF Power Density Limits........................................................................6 1.3 Issue Status............................................................................................................6 2 INTRODUCTION ....................
8 Module Descriptions ......................................................................................................28 8.1 Block diagram.......................................................................................................28 8.2 Audio / Video Encoder..........................................................................................29 8.3 COFDM Modulator ...............................................................................................30 8.4 Power Amplifier ......
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.
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.
1.1 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.
2 INTRODUCTION 2.1 GENERAL DESCRIPTION The RFX-PHT is designed to utilize the RFX-CMT. The RFX-PHT portable 2 GHz digital transmitter uses either 5 or 10 watt 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 stand-alone mode for temporary transmit application.
(fig. 2-5) Video In Audio #1 Input Remote Control Amplifier Output (to antenna) Power In (12 VDC at 12.5 Amps) (fig. 2-7) (fig. 2-6) Audio #2 Input (Yellow LED) (Red LED) Transmitter-to-Amplifier Jumper (Green LED) (fig. 2-8) (fig. 2-9) RFX-PHT Control Panel RFX-PHT/CMT Issue 1.
2.2 RFX-CMT DESCRIPTION The core component of the RFX-PHT is the RFX-CMT. The RFX-CMT unit replaced the original 0101 & 0102 variants. The upgrade from 0101 to 0102 added the extra feature of an SDI input. The upgrade from 0102 to 0104 added the extra features of frequency selection to 0.5MHz increments and greater choice of encoder & modulation modes. For details of the receiver please refer to the relevant manual.
Switchable Component / Composite Video SDI/CVBS Input cable connected Switchable SDI/CVBS Input (fig. 2:1:12) RFX-PHT/CMT (fig. 2:1:13) Issue 1.
Typical RFX-CMT mounting configuration (diagram 2-1) External Views of the RFX-CMT POWER AMPLIFIER RF OUTPUT BATTERY CLIP G igawave C E G igawave CAMERA INTERFACE D -Cam D -Cam AUDIO VIDEO SDI STATUS LED 12V DC ON OFF (diagram 2-2) RFX-PHT/CMT Issue 1.
2.3 HIGH-POWER AMPLIFIER The RFX-PHT’s high-power amplifier is a solid state GaAs FET amplifier. The unit uses a built in linearizer, which provides ultra-linear performance for rigorous system requirements. Features include a Single DC Supply, Over Voltage Protection, and Thermal Protection with Auto Reset, Temperature Compensation, Logic On/Off Control, and an Integral Output Isolator. Options include Forward/Reverse Power Detection, RF Sampling and Pulse Control with switching speeds up to 100 kHz.
3 ACCESSORIES / OPTIONS The RFX-PHT is designed for multiple applications. In order to fully support those applications, a variety of optional kits and accessories are available, including various antennas, optional high power amplifiers, and vehicle installation kits. 3.1 Vehicle Installation Kit The RFX-PHT Vehicle Installation Kit includes a mounting bracket which secures the RFXPHT carry case in place, a magnetic mounted rooftop omni-directional antenna, and DC power cable for vehicle battery power.
Technical Specifications No RFX-PHT/CMT ITEM TYPICAL REMARKS 1 Frequency Range 2.0 – 2.1 GHz 2 Impedance 50 Ω 3 VSWR (or Return Loss) ≤ 1.5:1 ( or ≥ 14dB) 4 Gain 8dBi 5 Polarization Vertical, Linear 6 3dB Horizontal Beamwidth 360° See plot (next page) 7 3dB Vertical Beamwidth 18° See plot (next page) 9 Max.
Radiation Pattern (H-Plane) Radiation Pattern (E-Plane) RFX-PHT/CMT Issue 1.
3.4 Receive Antenna Options Receive antennas standard with the RFX-PHT link are can be directional, controlled a variety of ways, from GPS auto-tracking to human control, or omni-directional. For more information on receive antenna options, refer to the RFX-RMR and RFX-RMR-X6 Operator’s Manual. RFX-PHT/CMT Issue 1.
4 SPECIFICATIONS Frequency Band 1.3 - 5GHz band Tuning Range 300MHz standard bandwidth. Wider bandwidths available to special order Frequency Selection Up to 16 pre-set channels or tuning in 0.5MHz steps via side mounted panel control Transmit Power 100mW or higher subject to customer requirements Transmit Antenna RF Central Omni Directional 4dBi gain (nom.
5 SYSTEM OPERATION 5.1 Camera Interfaces The RFX-CMT can be supplied with one of three battery and camera interfaces: • • • Sony ‘V’ Block / IDX Anton Bauer Gold Mount PAG These provide a flexible and versatile mounting system suitable for a wide range of cameras and battery options. The RFX-CMT is first mounted onto the camera rear battery interface. If required, an appropriate battery can then be docked onto the rear of the RFX-CMT transmitter.
RFX-PHT/CMT Issue 1.
RFX-PHT/CMT Issue 1.
5.5 Ch / Frequency Menu This menu is used to select one of the sixteen pre-programmed channels (CH1 – Ch16) or ‘manual’ frequency selection. The ‘Man’ setting allows control of the transmit frequency in 0.5MHz steps within preset limits (0.5MHz steps are applicable to this version of the transmitter; earlier versions have 1MHz steps). The Enter button allows the ◄► buttons to select the required digit, the ▲▼ buttons then select the required value.
5.9 Status Menu The status menu is used to confirm the condition of the RFX-CMT. If the Status LED is red indicating a fault or warning, the Status menu will indicate the nature of the problem.
5.13 FW Inventory The firmware version for the encoder and main unit controller can be obtained from this menu 5.14 Video Input/Video Format The RFX-CMT can accept either CVBS, YC, YUV inputs in either PAL (625) or NTSC (525) via the six pin LEMO Video input connector or can be set to generate internal test bar patterns of 75%, 100% or alternating between these two. SDI digital video can also be input via the BNC 75Ω connector if required this can also be used to input CVBS analogue video.
6 PREPARING FOR OPERATION 6.1 EQUIPMENT PREPARATION – High-Power / Vehicle-Mount Configuration 6.2 Preparing Vehicle Mounting Kit for operation Confirm that the vehicle-mounted rack is secured properly. Confirm Antenna is mounted correctly. Confirm that antenna cable is properly connected. Confirm vehicle battery cables are connected and secure. See Paragraph 5.2 (below) for preparation of Transmitter for operation (RFX-CMT). 6.
To disable the RF Power Amplifier the C and ◄ are held pressed as the RFX-CMT is switched on. 6.3.2 The Receiving Equipment The transmitter may operate in conjunction with a variety of RF Central receivers, including RFX-RMR and RFX-MVRX When used with the RFX-CMT transmitter the receiving equipment produces two audio channels, analogue (mono), and one (stereo) AES3; - the third and fourth audios are nonfunctioning when used with the.
7 Connector Pin Outs 7.1 SDI / CVBS Video BNC SDI or composite video, blanking & sync (CVBS) input. Switched via controller dependant upon Video Input Selection. See 5.14 75Ω BNC connector 7.2 Video Connector Composite (CVBS) / YC / YUV 6Pin Lemo Plug FGG.1B.306.CLAD62Z Pin 1 2 3 4 5 6 7.3 CVBS 0V CVBS YC Y(0v) Y C(0v) C YUV Y(0v) Y U(0v) U V(0v) V Audio Connector Line / Mic Hi Z 5-Pin Lemo Plug FGG.1B.305.CLAD62Z Pin 1 2 3 4 5 7.
Note: A diode is fitted to prevent the external power supply from ‘back feeding’ into the battery. The power switch is used to control the RFX-CMT only. The power supply to the camera is always available from the battery interface or external power connector. The camera on/off switch should therefore be used to control the camera independently. 4 Pin Lemo Plug FGG.1B.304.CLAD62Z Pin 1 2 3 4 7.5 Function 0V 0V +12V +12V Remote Connector RS232. 19200 Baud, 8 bit, 1 stop, No parity 4 Pin Lemo Plug FGG.0B.
8 Module Descriptions The RFX-CMT is based upon the highly successful dock-able Wireless Camera system. Internally, it is very different! Factory engineers have completely redesigned the RFX-CMT to compress all the circuitry from five circuit boards onto two. This greatly reduces space and weight compared with the original wireless product. The result is a Digital Wireless Camera system, which has exceptional RF performance, is well-balanced and easy to use.
8.2 Audio / Video Encoder The Encoder board consists of the following main functions: • SDI to Digital deserializer. Converts the SMPTE-259M-C serial digital video input to an 8 bit parallel digital video bus. • Analogue to Digital Video Converter, 10-bit over sampling ADC. Takes either Composite Video (75 Ω, 1v p-p) (CVBS); YC or YUV inputs in either PAL / NTSC format or converts to an 8-bit parallel digital video bus.
8.3 COFDM Modulator The acronym COFDM stands for “Coded Orthogonal Frequency Division Multiplexing – a modulation scheme which is used by the DVB digital television system.” The COFDM modulator has been designed to take its input from the MPEG2 encoder. This Transport stream is then modulated directly to the 2/2.5/3.5/4.5GHz band as appropriate. This method reduces the occurrence of intermodulated harmonic frequencies and requires less upconverters to reduce microphony.
8.5 Front Panel The Front Panel consists of a micro-controller, 16-character by 2-line LCD display, operator switches and interface circuits (see fig. 7:1). The Front Panel is the main system controller for the unit. All configuration of the unit hardware is from this board. An I2C two-wire interface is used to communicate with all other intelligent devices within the unit. This carries the command data and reads back status data from all boards within the unit.
9 Appendix A: MPEG Encoder Parameter Sets Applicable to CCAM-0109-101 software version PBSW-TDDB-0127-03 hex (October 2005) Note: The following parameters are typical for the transmitter and are issued for guidance only. Some transmitters may have different configurations according to individual customer requirements. Please consult the documentation supplied with the equipment for the details applicable to your system.
10 Appendix B: Table of DVB-T non-hierarchical bit rates Modulation Code rate QPSK 1/2 2/3 3/4 5/6 7/8 16-QAM 1/2 2/3 3/4 5/6 7/8 1/32 12.1 16.1 18.1 20.1 21.1 1/16 11.7 15.6 17.6 19.5 20.5 1/8 11.1 14.7 16.6 18.4 19.4 1/4 9.95 13.3 14.9 16.6 17.4 1/2 2/3 3/4 5/6 7/8 1/32 18.1 24.1 27.1 30.2 31.7 1/16 17.6 23.4 26.3 29.3 30.7 1/8 16.6 22.1 24.9 27.6 29.0 1/4 14.9 19.9 22.4 24.9 26.1 64-QAM RFX-PHT/CMT Bit rate (Mbit/s) at each guard interval (symbol fraction) 1/32 1/16 1/8 1/4 6.03 5.85 5.53 4.
