Almost everyone in the industry knows that modern communication satellites are at the heart of the high quality telecommunications services provide to millions of people around the world. However we sometimes take for granted just how remarkable these satellites and their associated ground systems have become.
After assembly satellites will be launched by a launch vehicle. With several additional pushes from an internal rocket, after 2 weeks they will finally arrive at the proper orbital slot 22,247 miles above the earth. For the next 13 to 15 years, in spite of the continuous push from the "solar wind" and the constant pull of gravitational forces, the satellite must be kept in exactly the same position so that the customers antennas will not have to search to find it. After the antennas and solar panels are unfolded and a short period of testing is completed, the satellites will be expected to run 24 hours a day, 7 days a week for 12 to 15 years. They will be expected to provide continuous communications services between all points on earth within the antenna "footprints" carrying huge volumes of video, voice and data.
Satellite communications technology evolved from microwave, radar and rocketry technologies developed during the Second World War. In 1945 Arthur C. Clark conceived the idea of geosynchronous satellites located in space to effect long distance communication. In the 1960's, successful experiments demonstrated the transmission of voice, data and video via satellite. In the late 70's and early 80's, microwave components became cheaper and satellite technology found more and more attractive applications in private networks. This trend was accelerated by the use of higher frequency bands such as the Ku- and Ka band.
The Ground or Earth Station
This is the earth segment. The ground station's job is two-fold. In the case of an uplink, or transmitting station, terrestrial data in the form of base-band signals, is passed through a base-band processor, an up converter, a high powered amplifier (HPA), and through a parabolic dish antenna up to an orbiting satellite. In the case of a downlink, or receiving station, works in the reverse fashion as the uplink, ultimately converting signals received through the parabolic antenna to base band signal.
Teleports are the "intermodal hubs" of the broadband and broadcast world — gateways that connect satellite circuits with terrestrial fiber optic and microwave circuits. Bridging the gap between land and sky, they allow broadcasters, internet-providers, and public and private network operators to outsource a non-core function that is critical to their businesses. Teleports deliver time-sensitive television and radio programming to audiences around the globe. They provide remote and underdeveloped regions with high-quality Internet and enterprise network connections.
An increasing number of Teleport operators have requested us to assist them in their hardware requirements.
Another type of ground station system is VSAT. VSAT is the abbreviation for Very Small Aperture Terminal and is an earth station characterized by its reduced dimensions and capable of transmitting / receiving a limited volume of traffic. VSAT's are designed to operate with antennas that are equivalent of 3.8 meters diameter or less. The size of a VSAT primarily depends on the data to be transmitted and its location. A VSAT antenna typically serves home and business users.
VSAT in general provide point-to-point or point-to-multipoint connectivity between points across the globe and offers a number of advantages over terrestrial alternatives. For private applications, a company can have total control of their own communication system. VSAT services are unaffected by physical barriers, multiple service suppliers and problems associated with the "last mile" connection. New sites can be added and existing connections reconfigured usually within a matter of days.
VSAT's are ideal for international businesses requiring worldwide connectivity for mission critical applications, disaster recovery, local access extensions, trunk redundancy, and host-to-host communications.
Skybrokers can provide VSAT antennas and accessories from different kind of manufacturers.
3. Earth Station Antennas
The primary specifications of an Earth Station Antenna (ESA) are given by shape, diameter, azimuth, elevation, fixed or tracking, de-ice system. It's important that technicians appreciate the theoretical aspects of antennas, in order to react effectively when the antenna has to be repositioned or when setting up radio/HPA output power which relies on knowing the antenna gain and feed system losses.
ESA are usually of a segmented construction, the segments being high-pressure compression molded. Because earth station antennas can be shipped in segments, they offer significant savings for the customer in freight costs and are particularly easy to handle on site, reducing overall installation costs. Typically, the antenna is manufactured of RF reflecting aluminum in the geometric form of a parabola.
Earth Station Antennas can be installed as a fixed station or with motorization and tracking. Skybrokers has knowledge of both type of systems. We can advise you what system is best for your applications. For your references please watch a video on YouTube: Installation of a refurbished Vertex 9m Earth Station Antenna.
Skybrokers team can assist you with:
1. Provisioning of New and used Earth Station Antennas
2. (Turnkey) Installation Services
3. Antenna Maintenance and cleaning
4. Antenna relocations
With all our antenna installations we provide a Rx pattern that meets the OEM specifications. RF testings are offered as an option.