RFID (Radio Frequency IDentification) is a wireless system used to identify tags. These tags may be carried by people or animals or mounted on object or vehicles. They may even be embedded under the skin.
RFID tags are non-contact and non-line-of-sight. This means that you don't have to "swipe" your card for an RFID system to identify you. Passive RFID vs. Active RFID
Passive RFID tags operate using power from the RFID transceiver. Passive tags are small and inexpensive...
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The MMCX connector, or MicroMate, is a type of RF connector used with coaxial cables. Like its predecessor, the MCX connector, the MMCX connector is a very small connector, designed for the high frequency range. MMCX connectors can carry information in ranges up to 6 GHz, and were designed to meet the requirements set forth by the European CECC 22000 specification.
Known as a type of micro-miniature connector, the MMCX connector is more flexible and more stable than the original MCX...
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The decibel is a standard unit for measuring relative levels of current, voltage, or power.
The decibel shows the ratio between the input and the output.
Decibel is abbreviated dB.
A minus sign before the dB indicates a loss and a plus sign or no sign at all before the dB indicates a gain. The Decibel Formula
The decibel value of a change between input and output can be expressed utilizing the following algorithm: db = log10 Input / Output A Decibel Table Decibel...
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The installation of an antenna starts with the analysis of few things that are decisive in ensuring reception quality. First you must decide which type of antenna will be used. Choosing the antenna type for the requirement is crucial, as the antenna used generally requires a specific antenna for the specific use. Next you must decide on antenna positioning. Selecting a position that provides the longest range and incurs the lease ambient noise is a key factor. It is generally considered...
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Satellite radio is a broadcast music service which was approved by the FCC in 1992. The FCC granted the first licenses in this space in 1997.
Satellite radio uses the 2.3 GHz S band frequencies.
Satellite radio is technically known as Digital Audio Radio Service (DARS).
Satellite radio broadcasters currently include Sirius Satellite Radio, XM Satellite Radio and WorldSpace.
XM Radio uses two geostationary satellites. Sirius Satellite Radio uses three satellites which travel in elliptical...
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The Federal Communications Commission (FCC) licenses the frequency spectrum in the United States.
Useful charts showing frequency allocations are available from the National Telecommunications and Information Administration (NTIA) at http://www.ntia.doc.gov/osmhome/allochrt.html.
This table shows commonly used names for various frequency ranges: Frequency Description 30 - 300 GHz Extremely High Frequency 3 - 30 GHz Super High...
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Portable radios are limited in the power at which they can transmit, usually somewhere between .5 watts and 5 watts. A very rough rule of thumb is that one watt equals one mile of range over flat and open terrain. Buildings and mountains will, of course, greatly modify effective range.
When two radios communicate directly with each other, this is known as Simplex. To achieve greater range, a radio repeater is often utilized. A radio repeater is a base station radio with a large antenna....
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The crystal radio is a rudimentary radio receiver that can be made from a few easy-to-obtain and inexpensive parts. It is unique for this type of radio does not require a battery pack, has no moving parts, and can be built using ordinary household materials, yet it actually works. The only power it receives comes from the radio signals. Radio Broadcasting Basics
It should not be surprising that crystal radios work. The basic principles of radio broadcasting make radio crystal operations...
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RF connectors, also known as a radio frequency connectors, include a number of different types of connectors constructed to work with a wide range of multi-megahertz applications. RF connectors provide a quick and easy way to connect coaxial cables to each other and to other devices. There is a range of capability among the different versions of the RF connector. Some of the more efficient types help to minimize the variance of transmission at the point of connection. The type of fastening...
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CB (Citizens Band) Radio is an unlicensed service. CB Radio consists of 40 HF channels on AM and SSB. Channel 9 is designated for emergencies and assistance.
The maximum allowable power for a CB radio is 5 watts. Repeaters are not allowed on CB radio.
CB Radio Usage
CB Radio is mainly utilized by truck drivers. CB radio is known for the colorful language utilized by its adherents, such as "10-4 good buddy". CB Radio...
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