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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.
Original file (1,650 × 1,275 pixels, file size: 3.79 MB, MIME type: application/pdf) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
In a dispersive prism, material dispersion (a wavelength-dependent refractive index) causes different colors to refract at different angles, splitting white light into a spectrum. A compact fluorescent lamp seen through an Amici prism. Dispersion is the phenomenon in which the phase velocity of a wave depends on its frequency. [1]
English: Figure 1-4 Electromagnetic spectrum diagram from The Army Institute for Professional Development, Principles of Radio Wave Propagation. February 2005, Number SS0130 Edition B February 2005, Number SS0130 Edition B
A cognitive radio (CR) is a radio that can be programmed and configured dynamically to use the best channels in its vicinity to avoid user interference and congestion. Such a radio automatically detects available channels, then accordingly changes its transmission or reception parameters to allow more concurrent wireless communications in a given band at one location.
In the past year, India’s Oscar submission Laapataa Ladies, the Golden Globe-nominated All We Imagine as Light, and the Sundance film Girls Will Be Girls embraced a necessary perspective.
The 2015 spectrum auction concluded on 25 March, after 19 days and 115 rounds of bidding. [43] Spectrum in the 800 MHz, 900 MHz, 1800 MHz and 2100 MHz bands was auctioned. The Government accrued a total of ₹ 109,874 crore (US$13 billion) [44] from the auction. Approximately, 11% of the spectrum available for auction remained unsold. [45 ...
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