RACK MOUNT TRANSMITTER (RFX-RMT) OPERATORS MANUAL Copyright 2005 RF Central RFX-RMT Issue 1.
CONTENTS 1 GENERAL SAFETY INFORMATION............................................................................3 1.1 Health and Safety......................................................................................................4 1.2 Maximum RF Power Density Limits ..........................................................................5 1.3 Issue Status ..............................................................................................................5 2 INTRODUCTION ..............
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.
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.
1.2 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.
2. INTRODUCTION This manual is to be used in conjunction with the RFX-RMT rack-mount switchable Analog/digital transmitter. When in digital mode the RFX-RMT offers significant features including ASI and component video inputs together with 4 audios (Analog, AES digital, or SDI embedded). The RFX-RMT transmitter is designed for permanent rack-mounted applications, such as ENG truck/vehicle or fixed link applications.
3. SPECIFICATIONS Frequency Band 1.97 – 2.50GHz band Frequency Selection As per US BAS allocation (current and future plans) Transmit Power 500mW nominal Digital Specifications Modulation COFDM DVB-T 2k Modulation Modes Data Rate QPSK, 16QAM, 64QAM FEC: 1/2 2/3 3/4 5/6 7/8 Guard interval: 1/32 1/16 1/8 1/4 4.98 to 31.
4. OVERVIEW OF RFX-RMT TRANSMITTER Motherboard SHF Power Amplifier Modulator Module Encoder Module RF switch Analog Transmitter Module Front Panel Module The RFX-RMT transmitter comprises seven main modules or assemblies:1. Motherboard. This board accommodates the digital encoder and modulator boards, as well as providing DC, signal and I2C communications routing to/from all other modules. 2. Encoder module.
5. Power Amplifier. This module accepts the Analog or digital RF signal at a level of –10dBm (nominal) and amplifies the signal to a level of 500mW (+27dBm) nominal. 6. Analog transmitter module. This module accepts an Analog composite video signal (NTSV) plus up to 2x Analog audio signals (line level) and uses conventional FM modulation techniques to produce an RF signal complete with audio subcarriers at the required RF frequency. 7. Front panel module.
5. FRONT PANEL CONTROLS Front panel view of the RFX-RMT The front panel of an RFX-RMT transmitter comprises quantity 2x 2-way switches (On/Off and Analog/Digital), 1x 10-way rotary switch (BAS channel number), six push button switches (used to navigate the various RFX-RMT menus) and an LCD display.
6. REAR PANEL CONNECTIONS Rear Panel view of RFX-RMT showing all connections 6.1.1a Video for Digital Transmit Section (BNC connectors) Connectors for either SDI digital, composite Analog or component Analog (Y/C or YUV) video or ASI transport stream. Selected via front panel keypad. 75Ω BNC connectors (female) 6.1.1b Video for Analog Transmit Section (BNC connector) Connector for composite video input. 75Ω BNC connector (female) 6.1.
6.1.3 Digital Audio for Digital Transmit Section (XLR connectors) The two channels of AES EBU stereo digital audio are connected via two 3pin XLR Female Connectors. The connectors are designated Ch1 and Ch2. Pin 1 2 3 Ground Hot/ + Return/ - 6.1.4 Analog Audio for Analog Transmit Section (XLR connectors) Line Level/ 600Ω balanced Z The two channels of Analog audio are connected via two 3pin XLR Female connectors. The connectors are designated Ch1 and Ch2.
6.1.7 User data (future option) Connector Type: 7 pin LEMO connector EGG.1B.307.CLN User data selectable as RS485 or RS232 (future option) Pin 1 2 3 4 5 6 7 RS232 CONNECTIONS RS485 CONNECTIONS Not Used Not Used User Data Not Used Ground Not Used Not Used Not Used Not Used User Data (-) Not Used Ground Not Used User Data (+) 6.1.
7.
• Audio Analog to Digital Converter, 48 kHz, 24 bit. Four high impedance Analog inputs. The channels are first buffered by a variable gain stage to cater for either Mic or Line level inputs. A switchable 20dB stage is also included to cater for low level Mic inputs. The audio channels are then converted into digital signals and passed to the MPEG2 Encoder. • Audio SDI de-embedder. Extracts digital audio from the SDI stream • MPEG2 Encoder. Compresses the video and audio.
7.2 COFDM Modulator The normal scheme of COFDM modulation adopted by RF Central for the RFX-RMT is 2k carriers with 8MHz RF bandwidth. The COFDM modulator has been designed to take its input from the MPEG2 encoder, or from an external ASI. This Transport stream is then modulated directly to the output frequency band (e.g. 2GHz). This method reduces the occurrence of inter-modulated harmonic frequencies and requires less up-converters The COFDM modulator RF output is via the SMB connector.
2. Convert two balanced line level (+9dBm 600 ohms) audio inputs to frequency modulated sub-carriers at nominally 4.83 and 5.8MHz. The independent operation of the two sub carriers is available via front panel control. The sub-carrier frequencies can be adjusted over a +/- 100 kHz range via front panel control, to facilitate regional and customer requirements. Video and R.F output circuit operation. The 75 ohm unbalanced video input is connected via board mounted SMB socket SK1.
These provide clock, data and latch enable inputs for the phase locked loop circuit IC6. (Also the common bus clock and data and separate latch enable for the two audio modulator PLL’s). The VCO R.F. output is attenuated and then split as described in the video and R.F. section above. The A.C. coupled R.F. sample is applied to IC6 RF input. The PLL has a reference frequency crystal (X2) oscillator of 8MHz.
The audio sub-carrier frequencies can be adjusted via the front panel display and controls and switched on / off independently. The sub-carriers are switched on via TR12, TR13. A logic ‘low’ level on PL1 pins 7 and 8 respectively switches on the A1 and A2 modulator oscillator circuits. Power supplies and monitoring The +12v input supply is filtered and regulated by IC7, +5v linear regulator.
Schematic layout of Analog transmitter module, RFX-RMT transmitter RFX-RMT Issue 1.
7.4 Power Amplifier The function of the power amplifier is to amplify the signal from the COFDM modulator to a suitable level for transmission. The amplifier is required to be highly linear to accommodate the high order modulation modes employed for digital system operation, with very low distortion (low inter-modulation between carriers). The nominal output power is +27dBm (500mW) (band specific).
8. 8.1 CONFIGURING THE TRANSMITTER Status Monitoring The red/green ‘status’ LED on the front panel indicates the condition of the RFX-RMT, if a fault or warning exists the LED will indicate Red and the Status menu will indicate the nature of the fault / warning. During initialization of the unit the Status LED will be off. 8.2 Top level Menu Six charts showing the menu trees of the RFX-RMT are included in this manual.
Top level and Current Operational State This is the display screen during normal operation of the RFX-RMT and indicates the Tx frequency (Channel number or Manual frequency), the current operating mode (Analog or digital), and the MPEG/COFDM parameters in use (digital operation). The B button is used to show other current parameters (digital = bit rate, encoder memory, video input mode, audio input mode, Analog = RF frequency, sub-carrier frequencies).
Audio 2, 3, 4 Menus As Audio 1 Status Menu The status menu is used to confirm the condition of the RFX-RMT. If the Status LED is red indicating a fault or warning, the Status menu will indicate the nature of the problem.
The video input may be selected to CVBS/YC/YUV, Analog, or SDI digital, or internal test color bars The Enter button allows the ▲▼ buttons to select the required value. The Enter button then stores the value and returns to the Main menu. In the event that BARS is selected, a sub menu allows ALT BARS, or 75% or 100% BARS to be selected. Video Format The video format may be selected PAL or NTSC The Enter button allows the ▲▼ buttons to select the required value.
8.6 Engineering Menu – ASI mode The engineering menu is entered by pressing the ◄ and ‘C’ buttons simultaneously for 2 to 10 seconds, then releasing the ‘C’ button.
8.7 Operations Menu – Analog mode Ch / Frequency Menu This menu is the same as the equivalent in the MPEG Operations menu Status Menu This menu is the same as the equivalent in the MPEG Operations menu 8.8 Engineering Menu – Analog mode The Engineering menu provides the method of system configuration; there are no user adjustments or setups internal to the Tx. The engineering menu is entered by pressing the ◄ and ‘C’ buttons simultaneously for 2 to 10 seconds, then releasing the ‘C’ button.
Channel Plan The RFX-RMT transmitter can be switched between two different sets of 10 preset RF frequencies known as the ‘Old’ BAS channel plan and the ‘New’ BAS channel plan. The ▲▼ buttons are used to select the channel plan menu. The Enter button then allows the ▲▼ buttons to select the required plan. The Enter button then stores the plan and returns to the Main menu. . RFX-RMT Issue 1.
RFX-RMT Issue 1.
Key: E = Enter E/C = Enter or Cancel A =◄ B =► RMT – OPS MENU - ASI MODE B DIGITAL TX CH10 2.49200GHz 16QAM__2/3__1/32 B ASI DATA RATE 12.064171 Mbit/s ▲ OR ▼ MAIN MENU ▲ CH/FREQ MAIN MENU Omitted when in Switch front panel control mode E ▲ TX MODE MAIN MENU STATUS E E Video Input CH/FREQ Select Ch 1 2.30000GHz Digital TX V CH/FREQ Ch 10 2.30000GHz E/C Select Analog TX C/E NO TS Present YES TS Rate YES Synth Lock YES CH/FREQ Manual 2.4460GHz CH/FREQ Manual 2.
RMT – ENG MENU - ASI MODE ENGINEERING Enter Engineering mode by pressing C and E buttons together Key: E = Enter E/C = Enter or Cancel ENG MENU CONTROL MODE ▲ ENG MENU FW INVENTORY E ENG MENU CHANNEL PLAN E CONTROL MODE FIRMWARE SWITCH CONTROL FP AVR 0305-05 ▲ OR ▼ ▲ ▲ ENG MENU ▲ Modulation mode E E/C Select OLD PLAN ▲ OR ▼ CONTROL MODE FIRMWARE Select KEYPAD CONTROL ENC AVR 0301-02 NEW PLAN ▲ Modulation mode QPSK ▲ Modulation mode 16QAM Modulation mode ENC FPGA 0101-80 ENG
RFX-RMT Issue 1.
ENGINEERING Enter Engineering mode by pressing C and E buttons together RMT – ENG MENU – ANALOGUE MODE Key: E = Enter E/C = Enter or Cancel ENG MENU CONTROL MODE ▼ ENG MENU PROG CHANNELS E ENG MENU AUDIO 1 FREQ E CONTROL MODE PROG CHANNEL SWITCH CONTROL Ch 1 2.30000GHz ▲ OR ▼ ▼ ▼ ENG MENU AUDIO 2 FREQ E E/C AUDIO 1 FREQ 4.83 3 ▼ ENG MENU CHANNEL PLAN E C/E AUDIO 2 FREQ 5.
9. PREPARING FOR OPERATION EQUIPMENT PREPARATION Before leaving the equipment base to undertake an operation it is recommended that the following equipment checks be made.
The Receiving Equipment The RFX-RMT transmitter may be used with a variety of RF Central digital receivers including RFX-MVRX receiver, a two box radio offering the convenience of triax remote Compatible RFX-RMR series rack-mounted switchable Analog/digital receiver Full details of the operation of the receivers are given in the associated manuals When used with the RFX-RMT transmitter, RFX-MVRX and RFX-RMR digital receiving equipment produces four audio channels (Analog and AES3 digital) together w
10. System Remote Monitoring and Setup Using a PC running Hyper Terminal or other terminal emulator, the RFX-RMT can be configured without the use of the operator controls and LCD display. The current configuration can also be obtained via this RS232/RS485 interface. (Please note that this feature is currently a future option for the RFX-RMT) RFX-RMT Issue 1.
Appendix A RFX-RMT MPEG Encoder Parameter Sets Set Part Number Rate (Mbit/s) COFDM Mode MPEG 0 PBMP-40870008-10 PBMP-40870010-10 PBMP-40870006-10 PBMP-40870009-10 PBMP-40870009-08 PBMP-40870011-08 PBMP-40870010-08 PBMP-40870012-08 PBMP-40870012-02 PBMP-40870010-02 PBMP-40870009-02 PBMP-40870011-02 PBMP-40870009-00 PBMP-40870012-00 PBMP-40870011-00 PBMP-40870010-00 18.
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-RMT Bit rate (Mbit/s) at each guard interval (symbol fraction) 1/32 1/16 1/8 1/4 6.03 5.85 5.53 4.98 8.
Rack Mounted Transmitter Controller (RFX-RMTC) OPERATORS MANUAL Copyright 2006 RF Central RFX-RMTC LAST REV: 14 December, 2006 Page 1 of 16
CONTENTS 1 GENERAL SAFETY INFORMATION ................................................................................3 1.1 Health & Safety ..........................................................................................................4 1.2 Maximum RF Power Density Limits............................................................................5 1.3 Issue Status................................................................................................................5 2 Introduction......
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.
1.2 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.
2 Introduction This manual is to be used in conjunction with the RFX-RMTC unit. The RFX-RMTC is a rack mountable antenna controller intended for used with an RFX-RMT transmitter and RFX-MMPA mast mounted amplifier and antenna switch. The combination of these units comprise an ENG transmit system capable of a minimum of 100mW to at least five watts of output.
3 Specifications Input RF from RFX-RMT (500mW maximum) Transmit Power (system) 100mW to 5W minimum (Front panel adjustable) Transmit Antenna Omni or Directional selected by front panel switch Connections RF In, RF Out, 12v DC for RFX-RMT, Antenna control, PA Sense Power Requirements Nominal 85 to 264v AC (Universal Input) Mechanical Interface Rack mounted 1 RU (1.75”) Size 19 X 12 X 1.75 inches Weight 10 lbs Environmental Temperature: Altitude: Humidity: RFX-RMTC -4º to +122º F 14,500 ft.
4 Installation Installation is simple and straightforward. 4.1 RF Input Connection Connect the RF output an RFX-RMT to the RF Input of the RFX-RMTC using a suitable length of low loss coax terminated with N connectors. 4.2 DC Connection Connect the DC input of the RFX-RMT to the DC output of the RFX-RMTC. This cable should be a minimum of 16 gauge terminated with four pin XLR connectors on each end.
5 CALIBRATION 5.1 Preparation Do not apply power until told to do so. Verify that all cables have been correctly connected between the RFX-MMPA and RFX-RMTC. Gather the following tools and test equipment: #2 Phillips Screwdriver 1/8 flat blade screwdriver (Greenie) DVM Thruline Watt Meter with slug to cover 2 GHz at 10 or 25 watts. High Frequency 50Ω dummy load. Remove the top cover using the Phillips screwdriver to access the calibration pots.
the “REV PWR” pot on the meter board so that the meter indication matches the reflected power as shown on the watt meter. 5.6 Minimum Power Output Set the TX POWER control fully counter clockwise and the reset the watt meter to read forward power.
5.
6 OPERATION Operation is also very simple and straightforward. 6.1 Antenna Selector Switch By selecting either Omni or Directional RF energy is supplied to the corresponding output on the rear panel. An omni antenna should be connected to the Omni RF connector while a directional antenna should be connected to the Directional RF connector. 6.
7 Connector Pin Outs 7.1 DC Power cable XLR Male to RFX-RMAC XLR Female to RFX-RMT Pin 1 2 3 4 Ground +12V 7.2 Antenna Control Connector 9 Pin Amp Connector, see Section 9 for chart. 7.3 PA Sense Connector 7 Pin Amp Connector, see Section 9 for chart.
8 Block Diagram RFX-RMTC LAST REV: 14 December, 2006 Page 14 of 16
Rf Out RFX-RMTC Chassis Function Gnd +24 Horz. Vert LC RC 2 / 7 GHz O/D Gnd Pin # 1 2 3 4 5 6 7 8 9 Function Gnd Pa V Rev Pwr Fwd Pwr +5V Pin # 1 2 3 4 5 6 7 Pa Sense Shield 12V DC PA Sense RMTC Antenna Control Rf Out RMTC to MMPA Wiring Nycoil Rf In LAST REV: 14 December, 2006 5VDC ON +12 Mon Gnd Ret Function Fwd Pwr Rev Pwr Function Gnd +24 Horz. Vert LC RC 2/7 Pin # 1 2 3 4 +24 Function Gnd Ant. Switch Pin # Ant.
This page intentionally blank RFX-RMTC LAST REV: 14 December, 2006 Page 16 of 16
