Satellite-Based Networks A very-small-aperture terminal (VSAT), is a two-way satellite ground station or a stabilized maritime VSAT antenna with a dish antenna that is smaller than 3 meters. The majority of VSAT antennas range from 75 cm to 1.2 m. Data rates typically range from 56 kbit/s up to 4 Mbit/s. VSATs access satellite(s) in geosynchronous orbit to relay data from small remote earth stations (terminals) to other terminals (in mesh topology) or master earth station “hubs” (in star topology).
VSATs are most commonly used to transmit narrowband data (point of sale transactions such as credit card, polling, or RFID data; or SCADA), or broadband data (for the provision of satellite Internet access to remote locations, VoIP, or video). VSATs are also used for transportable, on-the-move (utilizing phased array antennas) or mobile maritime communications.
V/U/HF Networks Two-way radio is a radio that can both transmit and receive (a transceiver), unlike a broadcast receiver which only receives content. A two-way radio (transceiver) allows the operator to have a conversation with other similar radios operating on the same radio frequency (channel). Two-way radios are available in mobile, stationary base, and hand-held portable configurations. Hand-held radios are often called walkie-talkies or handy-talkies.
Two-way radio systems usually operate in a half-duplex mode; that is, the operator can talk, or he can listen, but not at the same time. A push-to-talk or Press To Transmit button activates the transmitter; when it is released the receiver is active. A mobile phone or cellular telephone is an example of a two-way radio that both transmits and receives at the same time (called full-duplex mode). It uses two different radio frequencies (channels) to carry the two directions of the conversation simultaneously
Emerging Systems has the capability in terms of experienced engineers and skilled technicians to perform the complex tasks related to above mentioned telecommunication systems.