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Antennas at a ham operator's station in Chennai, India. Amateur radio or ham radio is a hobby that is practised by over 16,000 licensed users in India. [1] Licences are granted by the Wireless and Planning and Coordination Wing (WPC), a branch of the Ministry of Communications and Information Technology.
where is the angle between the antenna axis and the vector to the observation point, is the peak current at the feed-point, = / is the permittivity of free-space, = / is the speed of light in vacuum, and is the distance to the antenna in meters. When the antenna is viewed broadside (= /) the electric field is maximum and given by
This is a list of countries by Internet connection speed for average and median data transfer rates for Internet access by end-users. The difference between average and median speeds is the way individual measurements are aggregated.
It may refer more specifically to two subcategories: Passband bandwidth is the difference between the upper and lower cutoff frequencies of, for example, a band-pass filter, a communication channel, or a signal spectrum. Baseband bandwidth is equal to the upper cutoff frequency of a low-pass filter or baseband signal, which includes a zero ...
smaller, simpler, cheaper antennas – 2.4 GHz antennas have less than half the size of comparable-strength 900 MHz antennas and require less lightning protection; availability of proven free software like OpenWrt , DD-WRT , Tomato that works even on old routers ( WRT54G , for instance) and makes modes like WDS , OLSR , etc., available to ...
The letter following the dash (T or F) refers to the physical medium that carries the signal (twisted pair or fiber, respectively), while the last character (X, 4, etc.) refers to the line code method used. Fast Ethernet is sometimes referred to as 100BASE-X, where X is a placeholder for the FX and TX variants. [4]
A mobile phone signal (also known as reception and service) is the signal strength (measured in dBm) received by a mobile phone from a cellular network (on the downlink). Depending on various factors, such as proximity to a tower, any obstructions such as buildings or trees, etc. this signal strength will vary. Most mobile devices use a set of ...
The category of simple antennas consists of dipoles, monopoles, and loop antennas. Nearly all can be made with a single segment of wire (ignoring the break made in the wire for the feedline connection). [citation needed] Dipoles and monopoles called linear antennas (or straight wire antennas) since their radiating parts lie along a single ...