UHF Digital TV Transmitter System Operational in Mexico
A new UHF Digital TV channel started operation as Channel 20 in the town of Zacatecas (Mexico) with a transmission system designed and delivered by Cable AML.
The system delivered by Cable AML covers the complete RF transmission system from the Studio to the transmitter antenna.
The system includes digital encoder, STL (Studio to Transmitter Link), UHF Transmitter and transmission antenna. The ATSC transmitter delivers 1KW RMS power. It incorporates state-of-the-art adaptive pre-correction technology to achieve high MER at high power while minimizing thermal stress, resulting in a rugged design with outstanding reliability and durability.
It also comes equipped with multiple types of ASI input interfaces.This transmitter has an overall efficiency of over 40%, allowing for very efficient operation at low recurring cost. It incorporates a full set of control and monitoring features accessible via local touch screen or by remote control via SNMP or Web Interface.
The encoder accepts SDI/HDMI inputs from the studio and translates them to ASI format. Its modular design allows for additional slot for multiple input programs. The STL transports the Ai signal to the transmitter site, located on a high hill. The antenna system was configured to provide signal coverage tailored to the distinctive demographic and topographic profile of the city.
According to Mr.Armando Carrillo, “we are very happy with the quality of the hardware sup- plied and the excellent installation and commissioning support received from Cable AML, thanks to which we were able to install and start transmissions in a very short time”.
Digital Broadcast Network Installed in New York
Cable AML has delivered a Digital Transport and Broadcast Network transmitting four HDTV programs in dual DVB-C and IP formats for installation in New York State.
The system headend accepts four HD- SDI feeds from a TV studio and generates two outputs, in IP and DVB-C formats respectively.
The DVB-C carrier is 64QAM modulated and broadcasted through omnidirectional antennas with coverage of 25 Km radius.The same 64QAM signal is re-transmitted over the air at a total distance of over 100 Km using repeaters at relay stations, each of which reproduces the omnidirectional broadcast pattern of the first transmitter.
The IP-formatted signal is transported through conventional fiber-based networks and fed to isolated transmitters for rebroadcast in DVB-C format.The system design approach is modular, so as to allow for future expansion of the number of TV programs transmitted, the number of relay sites or the number of receiving stations.