Turks and Caicos Choose Cable AML Digital Video Backbone
Residents on the islands of Grand Turk, Salt Cay, Providenciales , North Caicos, Middle Caicos, South Caicos and East Caicos experienced an immediate and dramatic improvement in the quality of communications from government facilities after installation of a digital microwave backbone designed and manufactured by Cable AML. The system architecture consists of a number of links in series as opposed to a “star” or Point-To-Multi Point approach in which all delivery originates from a single, common point.
The three principal links in series are between 40km and 50km each, with a total route distance in excess of 130km, mostly over water. The combination of 5 links in series and spectrum constraints made it necessary to use digital MPEG2 encoding of the video channels and QAM modulation of the ASI carriers.
Fourteen receiving points downconvert the backbone signal to the conventional 54 to 870 MHz spectrum and feed rack-mounted Demodulators. The Demodulators feed signal to existing CATV systems that had never previously been interconnected.
A Cable AML MMDS transmitter in Salt Cay delivers analog signals from Grand Turk directly to subscribers.
The system will expand to three videos with their stereo audios in the next phase. The backbone can accommodate more than 200 video programs.
Affordable Omnidirectional Video Link Spans 20 KM
Multiservicios de Radiodifusion of Mexico City has installed a two-hop microwave link to transport one video signal at a distance of 20 kilometers.
The links , which are installed in Mexico, are used to transport a video and two audios from a mobile unit to a relay point at a distance of up to 20 kilometers, from which a second link retransmits the signal to the studios 7 kilometers away.
The link was configured using two TVLINKs in series. The mobile unit transmitter was mounted on a turntable platform which can be pointed in both azimuth and elevation to the Repeater. The repeater input antenna is also mounted on a rotatable platform which allows pointing of the antenna by remote control.
The second link has fixed antennas at a height of 20 meters. Multiservicios designed, fabricated and installed the remote-controlled movable platforms, allowing the mobile station to relay signals at distances of up to 20 kilometers.
Mr. Jesus Navarro of Multiservicios stated that “the equipment supplied by Cable AML has made it possible to deliver reliable service at a significantly smaller cost than with any other solution.”
5.8 GHz PTP Link Enters Service in Mexico
A Point to point TVLINK was purchased and installed by Ultravision to interconnect the studio and transmitters in Aguascalientes, Mexico.
According to Ingeniero Mario Tulio Santos, “The 15 Km link was extremely easy to install and align. We had it operating perfectly in less than 20 minutes”.
Ultravision is a leading MMDS and television service provider in Mexico, with operations in several cities throughout the country.
News Gathering System for Mobile Studio to Transmitter Link
A new, transportable, TV Studio to Transmitter wireless system has been designed and deployed in Mexico to feed a MMDS transmitter with local news feeds from mobile cameras located within 5 miles (8 kilometers) of the MMDS transmitter system.
The FM system, which operates in the 5.8 GHz band, an unlicensed band in the United States and many other countries, provides operators with a low-cost solution for local news gathering in small communities.
The system consists of a portable transmitter with an integrated flat panel antenna and a receiver with an omni-directional receive antenna. This allows reception of signals from all points around the transmitter without re-orienting the receive antenna.
The output of the receiver can be fed directly to the MMDS system. This enables low cost portable links for local news generation and transmission.
Online Channel Expands News Coverage with TVLINK
The company Canal Villavicencio, located in the city of Villavicencio, Meta (Colombia), increased the news coverage of its “online” channel by putting into service a point-to-point low-cost TV Link, model TVLINK5.8-121.
The microwave link connects a mobile camera unit to the TV studio, allowing live broadcast of current events in real time. The
link covers a transmission distance up to 30 kilometers.
The system operates in the “license-free” 5.8 GHz band and allows mobile coverage at low cost using portable equipment. This approach provides live connectivity from almost anywhere in the city and surrounding area to TV studio at the center of the city.
Mr. Carlos Chamorro, owner of the channel said,“I’m very satisfied with the system and the service provided by Cable AML.”
Low-Cost 65 Kms TVLINK in Cancun
A two-hop microwave link transporting one video channel for a total distance of 65 Kms has been installed in the Mexican resort town of Cancun to carry one TV channel from the Cancun TV station to Playa del Carmen, where it feeds a re-transmitting station broadcasting over the areas around Playa del Carmen and the island of Cozumel.
The link was implemented by installing two TVLINKS in series. The transmitter was installed in Cancun at a height of 80 meters and it feeds a relay station in Puerto Morelos, where a receiver and a second transmitter are mounted on a 28 meter tower. The second receiver is at Playa del Carmen at a height of 50 meters.
Ing. Melvin Gonzalez, Chief Engineer of Televisora Cancun, said that “The microwave link has been a complete success. It has been operating since the day it was installed with a very good quality signal and excellent reliability.”
Low-Cost PTP LINK Covers 35 KM
A low cost PTP link operating at 5.8 GHz has been installed in the state of Coahuila (Mexico) by Canal 5, to transport the local Channel 5 TV signal from Sabinas to a point 35 km away. According to Jorge Cesar, President of Canal 5, the link feeds a new TV transmitter covering the city of Muzquiz, also in the state of Coahuila.
Cable AML’s single and multiple-channel links provide a cost-effective method of transporting local channels to remote locations for rebroadcast or for inclusion in CATV systems
44 Mile Inter-Island Digital Video Backbone
Cable AML has provided a cost effective state-of-the art system to transport video feeds from the US Virgin Island’s Legislature in St Croix to the nearby island of St. Thomas.
The system’s first two hops are implemented with an 18 GHz FM modulated link carrying video and stereo audio from the USVI Government building in Fredricksted (St. Croix) to a relay repeater on St Georges Hill (1.75 miles) and then to a receiver at Blue Mountain (4.45 miles).
To minimize cost and complexity, an on-frequency repeater at St Georges Hill was used to avoid de-modulation, re-modulation and signal processing associated with conventional video repeaters.
At Blue Mountain the video and audio feeds are QPSK-modulated and frequency-multiplexed for transport by a 13 GHz bidirectional broadband link to the nearby island of St. Thomas (a distance of 44 miles).
The receiver at St Thomas recovers the base band video and audio for transmission to the Government facility and the local cable system (Innovative Cable).
The inter-island QPSK link provides a bidirectional backbone with sufficient capacity to allow expansion for transport of more video programming or additional data carriers