TM600-8VSB ATSC BROADCAST MODULATOR
TABLE OF CONTENTS 1.0 Safeguards .......................................................................................................... 3 General Safeguards .................................................................................................. 3 Safety and First Aid ................................................................................................... 4 2.0 Warranty.............................................................................................................. 5 3.
1.0 SAFEGUARDS General Safeguards This section is written as a general guide to keep all 5 fingers on your hand and is intended for those having previous knowledge and experience with these kinds of equipment. It is not intended to contain a complete statement of all safety precautions, which should be observed by personnel using this or other electronic equipment. DOCUMENTATION - Read, retain and follow instructions before operating the equipment.
Safety and First Aid Personnel engaged in the installation, operation, maintenance, or servicing of electronic equipment are exposed to the hazard of high voltage. It is imperative that all safety regulations and precautions are consistently observed. Knowledge of first aid procedures is recommended. The following information is presented as a reference only. DANGEROUS VOLTAGES AND CURRENTS MAY BE PRESENT IN THE EQUIPMENT EVEN THOUGH THE POWER IS OFF. REFER SERVICING TO QUALIFIED PERSONNEL.
2.0 WARRANTY Our legalese is straightforward. It is simply designed to give you peace of mind and helps you resist the temptation to have your electronics friend try to repair your Technalogix product. Technalogix Ltd. products have been completely tested and found to meet specifications and be in proper operating condition. They are warranted to be free from defects in materials and workmanship for a period of one year from the date of shipment.
To claim your rights under this warranty: • Contact Technalogix and describe the problem in as much detail as possible. See troubleshooting section in this manual. If a solution cannot be found at this time, it may be determined that the unit will have to be returned to Technalogix for repair, once a Return Materials Authorization (RMA) number is provided. Please look under our web site (www.technalogix.ca) for the RMA form (Service) and fill it out. Either fax it to us or email to us.
Terms & Conditions of Sale Sales by Technalogix Ltd (“Seller”) are made only on the terms which are contained in this Terms and Conditions of Sale Policy. Seller hereby gives notice of its objection to any different or additional terms and conditions. All sales are expressly conditional upon Buyers’ assent to the terms and conditions set forth below. These terms and conditions may be modified or supplemented only by a written document sighed by the authorized representative of Seller.
Terms of Payment Seller will provide credit terms to Buyer at its discretion. Such terms are subject to change at all times. If credit is provided, Seller will invoice Buyer on the date the product is ordered. Such invoices will be due and payable net thirty (30) days from date of invoice, subject to credit approval. If credit is not established or maintained, terms shall be net cash on or prior to the Delivery Date.
Custom Products Policy Custom items are not returnable; items other than “off the shelf” products are considered custom. Custom products, by their nature, are products and materials which have been altered, modified, cut, amended and customized to your order, and are not resalable or returnable. Orders for custom product are subject to a cancellation fee of up to 100% of the order, depending on the stage of completion of the order at the date the cancellation or revision is accepted.
3.0 OVERVIEW General Description The TM600-8VSB is a cost effective 8-VSB professional modulator especially designed for digital TV broadcasting applications. The TM600-8VSB accepts an MPEG-2 Transport Stream, processes it, and modulates it onto a VHF or UHF channel (selectable between VHF or UHF at time of order).
Specifications SMPTE Input Interface General Performance Function: Standard: Name: Connector: Type: Data Bit Rate: Packet Format: ASI Input Interface General Performance Modulation General Clock Reference Input General Performance 8-VSB Agile Modulator X2 Data stream inputs SMPTE – 310M SMPTE INPUT 1 and 2 SMA 75 Ω Input 19.39 Mbps (max.
Clock Reference Output General Performance RF Output General Performance Monitor Output General Performance 8-VSB Agile Modulator X1 Function: 10 MHz reference output Name: 10 MHz OUT Connector: SMA 50 Ω Type: Output Frequency: 10 MHz +/- 5 ppm Level: 0 dBm +/- 3 dB Thermal Stability: < +/- 1 ppm (0 to 50˚C) Tuning: +/- 5 ppm Aging: < +/- 1 ppm / year X1 VHF or UHF output (specify at time of order) Standards: ATSC Name: RF OUTPUT Connector: SMA 50 Ω Type: Output Frequency: 170 to 240 MHz (+/- 3 Hz),
Control Interface General Performance Function: Name: Connector: Type: Baud: Data Bits: Stop Bits: Parity Bits: Flow Control: X1 RS-232 Interface RS232 DB9 Input/Output 9600 to 115200 (57600 default) 8 1 None None Width: Depth: Height: Rack Unit: 19” (enclosure body 17”) 16” 3.5” 2U Physical Characteristics Dimensions General Electrical Specifications Power Requirements General 8-VSB Agile Modulator 115 Vac: 230 Vac: Issue 1.02 0.5 Aac 0.3 Aac December 9, 2008 www.technalogix.
Principle of operation The input of 8-VSB modulator is a MPEG-2 Transport Stream (TS) based on MPEG-2 at a fixed bit rate of 19.39265846Mbs. The TS has 188 byte packet structure. The 8-VSB spectrum is contained in a 6 MHz channel. The first byte (sync byte) of the MPEG-2 data packet is stripped and the remaining 187 bytes are randomized using a polynomial generator to prevent long strings of fixed states (1 or 0) that may occur and could increase chances of error.
ASI1 ASI2 SMPTE1 Input Management I(nt) TS ATSC Framing Q(nt) Non Linear Pre-correction I(nt) Q(nt) SMPTE2 I(nt) Q(nt) IQ Digital Modulator DAC IF RF Monitor Bandpass Filter Upconverter RF OUT Low Noise Synthesizer 10MHz In Clock Management Power Supply Control and Monitoring 8-VSB Agile Modulator Issue 1.02 December 9, 2008 www.technalogix.
Data Input Interfaces The module accepts an MPEG2-Transport Stream dedicated to ATSC transmission as specified in SMPTE-310M and ATSC Standard A/53. It also supports an ASI-320 (DVBASI) stream format. The two data inputs are implemented to allow for input data stream redundancy (Primary input / Secondary input). Data Input Management Bit Rate Adaptation and PCR (Program Clock Reference) Re-Stamping The ATSC transmission scheme relies on a very stable and accurate data stream clock.
Output Interface Management Channel Encoding: The modulator performs channel encoding according to the ATSC standard: - Randomization (energy dispersal) - Reed Solomon coding (RS coding) - Data field interleaving - Trellis coding (constellation building) Channel Modulation: The modulator performs channel modulation according to the ATSC standard: - Frame building - Pilot insertion - Constellation mapping - Nyquist filter Output Processes Linear pre-correction The modulator can perform linear pre-correctio
Non Linear pre-correction The modulator can perform non linear pre-correction over a 20 MHz bandwidth. The modulator can also perform amplitude and phase correction over the full spectrum of the signal. For these purpose two tables (AM-AM and AM-PM) of a maximum of 16 points (abscissa and ordinate values for each point) are downloaded in the modulator (“1S mode”). In “2S mode”, the user sets and downloads two groups of 16 points for each table.
RS-232 Port The RS-232 port uses the two standard RX/TX lines and a ground connection. The setting of the port is fixed with the following parameters: - No parity bit 57600 bauds (default), can be set from 9600 to 115200 Bauds 8 data bits 1 STOP bit No flow control 8-VSB Agile Modulator Issue 1.02 December 9, 2008 www.technalogix.
4.0 INSTALLATION This section contains installation recommendations, unpacking, inspection, and installation instructions for the Technalogix TM600-8VSB Modulator. Carefully read all material in this section prior to installation. Also, read and review the operating procedures later in this section. Building Recommendations The quality of the building is of great importance if you are to expect long life and continued performance from the modulator.
Heating and Cooling Requirements The environment’s temperature will contribute greatly to the length of the modulator’s life. Technalogix recommends that the building’s filtered air intake must have capacity for all air-flow in the building plus an additional 20%. Keep the intake below the roofline to avoid intake of solar heated air. Please ensure that the intake and exhaust areas are on the same side of the building to avoid pressure differentials during windy conditions.
Electrical Service Recommendations Technalogix recommends that a qualified, licensed local electrician be consulted for the required electrical service. We suggest local electricians because: • The personnel knows the local codes • The personnel can be on site readily • You are apt to get better overall support if you give what business you can to local suppliers Technalogix recommends that proper AC line conditioning and surge suppression be provided on the primary AC input to the power amplifier.
Antenna and Tower Recommendations Your preliminary engineering workgroup should establish your antenna and tower requirements, both for receiving and transmitting antennas. Construction of sturdy, high quality antenna/tower systems will pay off in terms of coverage of your service area, the overall quality and saleability of your radiated signal, and reduced maintenance expenses. Technalogix provides complete turnkey antenna systems if needed.
Shelter Security The FCC requires that the transmitter be secure from entry or control by unauthorized persons, and that any hazardous voltages or other dangers (including most tower bases) be protected by locks or fences as necessary to protect personnel and prevent unauthorized tampering or operation. Security of the building further implies that it be secure from wildlife. Use sturdy construction materials, including sheet metal if necessary.
Unpacking and Inspection Check the outside of the container. Carefully open the container and remove the modulator. Retain all packing material that can be reassembled in the event that the equipment must be returned to the factory. EXERCISE CARE IN HANDLING EQUIPMENT DURING INSPECTION TO PREVENT DAMAGE DUE TO ROUGH OR CARELESS HANDLING. Visually inspect the enclosure of the modulator for damage that may have occurred during shipment.
Location and Function of Controls and Connectors The following illustrations depict the location of the installation connectors when installing the modulator portion of the system. FRONT BACK Front Panel: Test Point- Provides a sample of the RF output level. RF test point is only a relative indicator of the actual RF output level and may vary. All RF operating measurements should be made at the RF output of the unit. RS232 - Textual low level command interface.
Modulator Operation 1. Terminate modulator into a 50 ohm load before applying power. 2. Connect the power cord of the Technalogix modulator to a proper electrical source as indicated on the back of the unit. 3. Connect the MPEG-2 encoded input to the jack on the rear panel (either ASI-320 or SMPTE-310). 4. Connect the RS232 on the front panel to a computer and run the control software. 5. Select the desired output channel by entering the center frequency on the “Frequency” space. 6.
If reception problems are encountered, and the quality of transmission is satisfactory, the difficulty is often with the receiving antenna or with obstructions in the path between the transmitter/translator and receiver. If pixilation has occurred, ensure that you are not running too many individual SD channels through the modulator and that your bit rate is spread too thin. This will be especially noticeable with sports and pictures that contain fast moving images. 8-VSB Agile Modulator Issue 1.
THANK YOU FOR CHOOSING TECHNALOGIX Ltd. 8-VSB Agile Modulator Issue 1.02 December 9, 2008 www.technalogix.
