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What is Short wave?

RADIO FREQUENCY

short•wave Pronunciation: (shôrt'wāv')

Definition :
1. Elect.a radio wave shorter than that used in AM broadcasting, corresponding to frequencies of over 1600 kilohertz: used for long-distance reception or transmission.
2. Physics. An electromagnetic wave with a wavelength of approximately 200 meters or less, especially a radio wave in the 20 to 200 meter range.

Shortwaves:  short waves, radio waves whose frequencies range from about 3 to 25 megahertz (Mhz), corresponding roughly to the high-frequency band (see radio frequency). When they impinge on certain layers of the ionosphere, short waves are largely reflected back toward the earth. By one or more reflections between the earth and the ionosphere, a short-wave radio signal can be received at long distances from the transmitter.

DXING 

DXing - Most listeners are content to listen to the stronger stations, though there is also another equally interesting aspect of the hobby, which seems to suit those with more of a technical interest. This is termed DXing. The term is not defined in any of the dictionary but if we let D stand for Distance and X, as in mathematics, stand for Unknown, then we see the term DXing as meaning "listening to radio stations from an unknown distance." A person engaged in the hobby is called a DXer . 

PROPOGATION

 

Radio waves, like light waves and all other forms of electromagnetic radiation, normally travel in straight lines. Obviously this does not happen all the time, because long - distance communication depends on radio waves traveling beyond the horizon. How radio waves propagate in other than straight-line paths is a complicated subject, but one that need not be a mystery. This page provides basic understanding of the principles of electromagnetic radiation, the structure of the Earth's atmosphere and solar-terrestrial interactions necessary for a working knowledge of radio propagation.  More details about radio propagation and other technical info can be found at ARRL-The National Association for Amateur Radio  technical information service page :               

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Radio frequency, range of electromagnetic waves with a frequency or wavelength suitable for utilization in radio communication. Some of these waves serve as carriers of the lower-frequency audio waves; others are modulated by video or digital information. Short waves have relatively high frequencies; long waves have relatively low frequencies. Radio waves are identified by their frequencies, expressed in kilohertz (kHz), i.e., thousands of cycles per second, in megahertz (MHz), i.e., millions of cycles per second, or in gigahertz, i.e., billions of cycles per seconds. Signals in the amplitude modulation (AM) broadcast band have frequencies ranging from 540 to 1,800 kHz. Frequency modulation (FM) broadcast frequencies range from 88 MHz to 108 MHz. A range, or band, of radio frequencies is regularly assigned to a broadcasting station or service by the nation in which it operates. In the United States, the Federal Communications Commission is responsible for that task. Countries cooperate on on a worldwide basis through the International Telecommunications Union, which holds periodic conferences. 

Informative Article on Shortwave Radio, International Broadcasting 

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Grey Line Map 

The "grey line" is a band around the Earth that separates daylight from darkness.  Propagation along the grey line is very efficient.  One major reason for this is that the D layer, which absorbs HF signals, disappears rapidly on the sunset side of the grey line, and it has not yet built upon the sunrise side. Ham radio operators and shortwave listeners can optimize long distance communications to various areas of the world by monitoring this band as it moves around the globe. This map will automatically refresh every 5 minutes.                                                     Enter here!

WORLD TIME SERVER, ANY TIME, ANY WHERE

Get Current Time with World Time Server
world time server Enter a country or city:

The Sun, The Earth and the Ionosphrre 

a brief introduction to propagation and the major factors affecting it By Carl Luetzelschwab, K9LA

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Near-Real-Time MUF Map

This is a highly informative map that can be used by amateur and professional radio communicators to determine maximum usable frequencies for any world-wide path at the indicated UTC (Zulu) time.

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Universal Time Coordinated (UTC) Vs Indian Standard Time (IST)

UTC

0

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9

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IST

0530

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0730

0830

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1330

1430

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1630

UTC

12

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20

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IST

1730

1830

1930

2030

2130

2230

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0030

0130

0230

0330

0430

 

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