Installation and Operations Manual 7GHz Truck Coder II System DOC# 6051419100X3 July 2006 Broadcast Microwave Services, Inc.
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INTRODUCTION The BMS Truck-Coder II (TCII) is an ENG transmitter that operates in both digital (COFDM) and legacy analog (FM) transmission modes. It features a DVB-T compliant (COFDM) modulator MPEG2 video encoder. The system is designed to support both 12 MHz and 17 MHz BAS channel plans (in both Digital and FM transmission modes). The two-unit system consists of an Indoor rack-mounted exciter Unit (IDU) and an Outdoor mast-mounted RF Transmitter Unit (ODU).
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Table of Contents INTRODUCTION........................................................................................................................................... i SYSTEM DESCRIPTION ............................................................................................................................. 1 Overview.................................................................................................................................................... 1 Indoor Unit.......................
Figure 4 IDU Footprint................................................................................................................................. 13 Figure 5 ODU Footprint ............................................................................................................................... 14 Figure 6 TCII Indoor Unit ............................................................................................................................
WARNING! RF RADIATION EXPOSURE HAZARD This warning is provided by Broadcast Microwave Services (BMS) Inc. for safety purpose. The following information help to reduce the risk of RF exposure hazard. FCC Limit of RF Exposure According to Federal Communication Commission (FCC), the Maximum Permissible Exposure (MPE) for FR radiation has been set to 1.0 mW/cm2 for the 7GHz Truck-Coder II equipment (OET Bulletin 65).
Estimated RF Exposure for 7 GHz Truck-Coder II 5.0 Power Density, mW/cm^2 4.0 3.0 0 dBi Antenna Max Exposure at 20 cm 5 dBi Antenna Max Exposure at 35 cm 2.0 30 dBi Antenna Max Exposure at 560 cm 16 dBi Antenna Max Exposure at 112 cm 1.0 Max Permissible Exposure: 1mW/cm2 0.0 0 100 200 300 400 500 600 Dis tance , cm Figure 1 Summary In order the keep the RF exposure within the FCC limit, it is necessary to maintain the safe distance from the antenna.
SYSTEM DESCRIPTION Overview The Truck-Coder II (TCII) is an ENG transmitter that will operate in both Digital (COFDM) and Analog (FM) modes. The system comprises of an indoor unit (Exciter) and a mast mounted outdoor unit (RF transmitter). Figure 1 TCII System Overview The indoor unit is designed to be rack mounted within an ENG van. It is housed in a 2RU 19-inch rack mount enclosure and powered from a conventional 120V AC source.
To simplify installation, only a single coaxial cable is required to interconnect the IDU to the ODU; DC power, 70MHz IF and telemetry signals are all multiplexed onto this single cable. The system also supports legacy cable systems that feed DC power on separate conductors. The indoor unit features a menu driven front panel display (vacuum fluorescent) that is used to configure the equipment and monitor its performance.
The FM modulator is designed to accept analog audio and video inputs. Support for 2 audio channels is provided via frequency programmable sub carriers that ride above the video signal The frequency deviation is user configurable to support operation in either a 17 MHz or 12 MHz channel allowing Analog operation to continue after the channel plan transition is complete. Analog transmission offers a more graceful degradation in performance and might be preferred under certain conditions.
Outdoor Unit A simplified block diagram of the ODU is shown below: Figure 3 TCII Outdoor Unit (ODU) Block Diagram The ODU is mounted outdoors and connected to the IDU by a single coaxial cable. The ODU is in constant communication with the IDU via a telemetry channel that is frequency multiplexed onto the single cable interface between the IDU and ODU. This channel is used to configure the ODU (select frequency, power level etc) and also to monitor performance (PLL lock, temperature etc).
Technical Specifications Table 1 General Specifications Indoor Unit (IDU) Outdoor Unit (ODU) 17.5 x 14.9 x 3.5 in (44.1 x 37.8 x 8.9 cm) 15.0 x 3.7 x 9.0 in (38.1 x 22.9 x 9.2 cm) 11 lb (5 kg) 16.5 lb (7.5 kg) 15,000 ft 15,000 ft Operating Temp -20 - +55º C -20 - +55º C Stor.
Table 2 Analog (FM) Feature Spec Video 4.0MHz pk /17 MHz Ch 3.5MHz pk /12 MHz Ch 405 (Per CCIR Recommendation) 2 GHz 63 dB Typical (60 dB min.) 7 GHz 63 dB Typical (61 dB min) Video Deviation (MHz) Video Pre-Emphasis VSNR (@12 MHz) Audio Frequency (Programmable) Audio Sub-Carriers (2) #1 #2 4.83, 5.5, 5.8, 6.2, 6.8 MHz 5.5, 5.8, 6.2, 6.8, 7.
Table 4 TCII Input/Output I/O Format IF OUT (to ODU) 70 MHz IF Output with Control & Power (selectable 50 or 75 ohms) IF IN 70 MHz (0dBm, 75 Ω) Aux. IF OUT 70 MHz (0dBm, 75 Ω, BNC-f) ASI IN 75 Ω (HD Capable) ASI OUT Encoder Output 75 Ω (BNC-f) Digital Video IN SDI w/Embedded Audio (SMPTE 259C CCIR 601) Aux Inputs (4) General purpose inputs that control respective Form ‘C’ contact closures available at the ODU.
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UNPACKING No special instruction is required for removing the items from the packaging other than to open the box with care as to not damage any of the contents. Parts List Manuals Item Part Number TRUCK-CODER II INSTALLATION AND OPERATION MANUAL 6051419100 Quantity 1 Components Item Part Number Quantity Indoor Unit (IDU) 8014191000 1 Outdoor Unit (ODU) 8014192700 1 Installation Kit 7614191020 1 Cables The versatile design of the TCII makes it suitable for many different applications.
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INSTALLATION NOTE: The TCII equipment installation should only be performed by qualified technicians in compliance with safety regulations and accepted industry practices. Equipment Installation The following equipment will need to be installed: Indoor Unit (IDU) Outdoor Unit (ODU) Please refer to component footprint drawings listed in Table 5 to aid installation.
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17.5 in 44.1 cm 14.9 Do Not Block Fan Inlets or Outlets Do Not Block Fan Inlets or Outlets 3.5 in (8.9 cm) 19.0 in 48.
Figure 5 ODU Footprint 14
Installing the Indoor Unit (IDU) Figure 6 TCII Indoor Unit To install the Truck-Coder II Indoor unit: The TCII Indoor unit is designed to fit in a standard 19” rack using either permanent shelf or rails to support the IDU. A mounting kit (BMS P/N 7614191020) is included if needed. Select a location to mount the unit. There needs to be enough space around the unit to allow for proper ventilation and access to connections.
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Indoor Unit (IDU) Connections SDI IN FULL BW SERIAL DIGITAL VIDEO INPUT WITH EMBEDDED AUDIO COAXIAL CONNECTION (TRIAX OPTIONAL) TO TCII-ODU-(X) OUTDOOR UNIT 70MHZ IF, DC POWER, AND ACCESSORY PANEL CONTROL SIGNALS FOR EXTERNAL ODU POWER (TYPE “N”) OPTION OR COMPONENT VIDEO OPTION ASI IN ASI OUT FROM EXTERNAL SD OR HD ENCODER MPEG2 COMPRESSED VIDEO OUT TO ASI MUX OR MONITOR AC POWER IN SDI IN W/ AUDIO WARNING 85 – 265 VAC 2 AMP 48 VDC PRESENT ON THIS CONNECTOR 70 MHz/ 48 VDC/ TM OUT AUDIO2 IN ASI
Installing the Outdoor Unit (ODU) Figure 8 TCII Outdoor Unit The ODU is designed to be mounted on an antenna mast using a custom mast mount specifically designed for the mast. See Figure 9 for footprint requirements, hole sizes and hole locations to aid in the design of the custom antenna mast mount.
Figure 9 ODU Mounting Footprint 1. Secure the ODU to the custom antenna mast mount with 16-#10 screws (included in installation kit BMS P/N 7614191020.) Note: The Orientation of the ODU is critical to the performance of the TCII system. The ODU must be mounted on the Antenna mast so that the RF connectors are down.
UP Figure 10 ODU Mounting Orientation 2. Make the appropriate connections to the ODU. 3. All unused connectors must be capped and sealed to protect the ODU from the weather & elements. See Table 6. Table 6 Connector Caps Connecter Connector Protection Cap BMS P/N (Use self vulcanizing tape to secure seal.
Figure 11 ODU Connections Table 7 ODU Connections Component Outdoor Unit (ODU) Connection Connecting Component J1 EXTERNAL DATA IN Factory Service Port Only – This connector should be capped and sealed during operation J2 EXTERNAL DC IN External 24VDC Power Supply – Most systems will be powered through the Coax requiring this connector to be capped and sealed. J3 RF OUT ANTENNA J4 ANTENNA CONTROL To Auxiliary Equipment or capped and sealed if not used.
OPERATION NOTE: Follow all procedures precisely to ensure initialization & operation. Initialization 1. Power the TCII on by switching the System Power to the ON position. The green indicator light to the right of the power switch will turn on immediately. 2. The TCII will immediately go into a diagnostics/test mode and will take about 20 seconds to initialize before the display is activated. 3. Once the internal systems check out, the TCII will display the HOME Screen.
The home menu will display the current transmission frequency and status ( RF: STANDBY or RF: ON) and various transmission settings. 1. Verify transmission TCII status. The frequency or the Preset Description will appear on the left in the Status line. The transmission status will appear on the right. The current settings for transmission MODE, selected ANTENNA, antenna POLARITY , CHANNEL, TEST signal, and RF POWER are indicated by the underline. 2.
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WARRANTY BMS warrants that, at time of delivery, the product will be free from defects in materials and workmanship, provided the equipment or system is installed, operated and maintained in accordance with the Operation and Maintenance manual or such other BMS documentation as may be applicable. Any such defect reported to BMS within two years, BMS will take reasonable and prompt action to repair or replace such equipment. Should any of the components be defective, please contact BMS immediately.
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TROUBLE SHOOTING The TCII has certain required parameters. When anomalies happen and the TCII starts to operate outside the specified parameters, the fault indicator light will be activated and the system status will scroll across the top of the HOME screen. Below is a list of faults along with the possible causes and solutions. Fault Cause Solution COMMS FAIL IDU not communicating with ODU. Internal Failure Check connections. Shut down then restart the TCII to reset.
Diagnostics The Diagnostic Table contains a list of the most common problem symptoms and their solution. Symptom Possible Cause Solution Tone at receive site - Video OK Test signal turned on at transmitter Wrong frequency, polarity or mode. On HOME Menu, select TEST OFF Unit is in Standby Place transmitter in transmit by pressing RF On/Standby button.
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PIN OUTS IDU SDI IN W/ AUDIO WARNING 85 – 265 VAC 2 AMP 48 VDC PRESENT ON THIS CONNECTOR 70 MHz/ 48 VDC/ TM OUT AUDIO2 IN ASI OUT IN 10/100 ETHERNET RS-232 DCE TELEMETRY RS-232 CONTROL AUDIO1 IN 70 MHz AUXILIARY INPUTS OFF SUMMARY ALARM OUT VIDEO IN IN RS-232 AUX DATA ON 48 VDC Figure 14 IDU REAR PANEL CONNECTORS Table 8 AUXILIARY INPUT PINOUTS AUXILIARY INPUTS 1 PIN Description 1 2 3 4 5 6 7 8 RELAY 1 RELAY 2 RELAY 3 RELAY 4 RETURN 1 RETURN 2 RETURN 3 RETURN 4 The auxiliary inputs a
Table 10 AUDIO 1 IN PINOUTS 2 1 3 PIN Description 1 GND 2 POS 3 NEG Table 11 AUDIO 2 IN PINOUTS 2 1 3 PIN Description 1 GND 2 POS 3 NEG 31
ODU Figure 15 ODU CONNECTORS Table 12 J1 EXTERNAL DATA IN G F H K A E J B D C PIN Description A NC B RESERVED C GND D NC E NC F NC G GND H RESERVED J RESERVED K RESERVED Table 13 J2 EXTERNAL DC IN PIN OUTS (Optional) 32 PIN Description A + V DC B +V DC C Return D Return
Table 14 J4 ANTENNA CONTROL PIN OUTS PIN Description A +24 V B GROUND C ANT2 D BAND E H POLE F V POLE G LC POL H BMS POLE E J FEED TYPE K BMS POLE F Feed Type is configured by the cable connector.
US Broadcast Frequency Assignments Old BAS Channel Plan 2 GHz (S) Band 1990-2110 MHz 1 1994.75 2 2012.25 3 2029.25 4 2046.25 5 2063.25 6 2080.25 7 2097.25 17 MHz CW 1999.00 2016.50 2033.50 2050.50 2067.50 2084.50 2101.50 2003.25 2020.75 2037.75 2054.75 2071.75 2088.75 2105.75 New BAS Channel Plan 2 GHz (S) Band 1990-2110 MHz A1r 2028.50 2031.50 A2r 2040.50 2043.50 A3r 2052.50 2055.50 A4r 2064.50 2067.50 A5r 2076.50 2079.50 A6r 2088.50 2091.50 A7r 2100.50 2103.50 12 MHz CW 12 MHz CS 2034.50 2046.50 2058.
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Coded Orthogonal Frequency Division Multiplex (COFDM) Modulation COFDM is used for microwave applications like wireless cameras and mobile video links because of its tolerance to multipath transmission errors. In addition COFDM offers more than twice the spectral efficiency of comparable FM analog microwave transmission. COFDM does not rely on the vulnerability of a single carrier but spreads the digital information over many narrow band carriers using Frequency Division Multiplex (FDM).
Code Rate The code rate represents the amount of Forward Error Correction (FEC) used for each active symbol. FEC is a method of obtaining error control in data transmission. A code rate of ½ means that for two bits of information received, 1 bit is the real data. The other bit tells how intact the first bit is. A code rate of 7/8 means that out of the 8 bits sent, there are 7 bits of real data and only 1 bit that is to catch any errors in those 7.
Modulation Transport Rate (Mb/s) at each Guard Interval for 6 MHz BW Code Rate 1/4 QPSK 16QAM 64QAM 2 1/8 1/16 1/32 Transport Rate (Mb/s) at each Guard Interval for 7 MHz BW 1/4 1/8 1/16 Transport Rate (Mb/s) at each Guard Interval for 8 MHz BW 1/32 1/4 1/8 1/16 1/32 1/2 3,7322 4,147 4,391 4,524 4,354 4,838 5,123 5,278 4,98 5,53 5,85 6,03 2/3 4,976 5,529 5,855 6,032 5,806 6,451 6,830 7,037 6,64 7,37 7,81 8,04 3/4 5,599 6,221 6,587 6,786 6,532 7,257 7,684
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Glossary Analog Transmission Frequency Modulated (FM) method of sending information with radio waves. An older, dependable method of transmission. (See Digital Transmission) Antenna Actuator The mechanism which deploys or retracts the antenna radio operation or for landing and take-off. ASI: Asynchronous Serial Interface. Transmission standard used to connect video delivery equipment within a cable, satellite or terrestrial plant.
MPEG-2 A compression standard for digital video and audio data. Multipath The radio wave propagation phenomenon that results in the transmitted signals. reaching the receiving antenna by two or more paths. This condition is not desirable and usually results in signal fading and interference. MUX The combining of multiple signals into a single transmission.
