The basic types of satellite systems include geostationary (GEO), Low Earth Orbit (LEO), Medium Earth Orbit (MEO), and Highly Elliptical Orbit (HEO) satellites. There are also public and private satellite systems such as Television Receive Only (TVRO), Direct Broadcast Satellite (DBS), Global Positioning System (GPS), and multibeam satellite operations. Geosynchronous satellites orbit the Earth on …
A heterodyne is a circuit that transfers a signal from one carrier wave to another with a different frequency. It mixes the input signal with a wave generated by an oscillator to create two new signals, called beats. While heterodyning is a simple process governed by the laws of trigonometry, most heterodynes are complex devices …
QPSK (Quadrature Phase Shift Keying) is a phase modulation algorithm. Phase modulation is a frequency modulation version where the carrier wave’s phase is modulated to encode bits of digital information in each phase change. The “PSK” in QPSK refers to the use of Phased Shift Keying. Phased Shift Keying is a form of phase modulation …
MIL-C-5015, now known popularly as MS connectors, are multi-pin, highly durable connectors that were originally invented for use in military applications. They have a variety of features that makes them easy to use for nearly any application and are often found in a variety of advanced, high power, heavy duty devices in the industrial world. …
A projector lamp is used to transfer an image from a multimedia projector onto a larger screen. Earlier halogen bulbs were used for many years for projection purposes, but were discontinued as halogen produced a yellow tone on the images. A projector lamp relies on an intense light bulb, called a metal halide bulb, to …
RFID (Radio Frequency Identification) is a wireless system used to identify tags. These tags may be attached to objects and even embedded under the skin of animals and human beings. Therefore, we can describe RFID as a form of identification tracking that allows retail outlets, airports, zoos, libraries, office buildings, warehouses, and different types of …
A multivibrator is a device that changes between two states and its own design or an external force powers it. For example, a weight that is placed on a suspended spring will extend the spring to its maximum length as gravity weighs down on it. When the spring is stretched to its maximum length, however, …
TV-GPS is a technology from Rosum Corporation of California. Basically, it is a GPS tracking technology that makes use of television broadcasting signals to intensify or strengthen GPS signals. It is slated for use in urban areas where most people own a television (so the TV broadcasting signals are extremely strong) and where the regular …
A Ham radio antenna tower is usually a metal tower that hams use to support their antennas. There's also an interesting story behind birth of the terms Ham or amateur radio. The actual signification of the term 'ham' was lost but there are several theories that explain its provenience. For example some say it was …
Fixed Satellite Service (FSS) is a type of mobile telephone service that allows users in a specific area to make and receive cell phone calls. FSS systems or cell phone towers are placed in strategic, fixed locations and provide service to thousands of individual users simultaneously. Generally, FSS systems provide reception for several square miles …