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When the M curve has a negative slope the curvature of the ray is concave downward on a plane earth diagram and the true curvature of the rays is greater than the curvature of the earth. Hence rays wh
(Author: Tymon Hytem
| Word Count: 454 | Published: Sep 7th 2007)
162: Static and Noise
By the term static is meant the radio disturbance caused by natural causes such as lighting, electrical sparks etc. the disturbances so produced in a receiver are sometimes called noise but usually th
(Author: Tymon Hytem
| Word Count: 459 | Published: Sep 7th 2007)
163: Space wave propagation
By space wave we mean the radio wave which travel from the transmitting antenna to the receiving antenna through the space that is the earth’s troposphere. Earth’s troposphere extends from the earth’s
(Author: Tymon Hytem
| Word Count: 472 | Published: Sep 7th 2007)
164: Pulse Code Modulation
Pulse amplitude modulation, pulse width modulation and pulse position modulation form cases of analog pulse system. Pulse code modulation and delta modulation form cases of digital pulse modulation. P
(Author: Tymon Hytem
| Word Count: 446 | Published: Sep 7th 2007)
165: Fading
By fading of a radio signal we mean that incident wave change in the field strength of signal received from distant transmitter. The fading of signal may be put into the following two categories namel
(Author: Tymon Hytem
| Word Count: 451 | Published: Sep 7th 2007)
166: Do You Feel Lucky ??
On this morning's journey to work I had to face a difficult choice: should I walk under a ladder, or get off the pavement completely and walk along the busy main road? Or to put it another way: did I
(Author: Andrew Impey
| Word Count: 914 | Published: Sep 3rd 2007)
167: Helpline for Pot Plants
Scientists have come up with a way for your pot plants to have a hot-line to your mobile. What more could you want? Hannah Welham wonders whether it's really such a good thing to have your foliage cal
(Author: Andrew Impey
| Word Count: 588 | Published: Sep 3rd 2007)
168: Jellies Gee Up Japan
Sloopy, gloopy, gooey, sticky - slime may not sound too appealing but the world would be lost without it. Slugs and snails need it to get across the garden path; seaweeds use it to keep the sun off; a
(Author: Andrew Impey
| Word Count: 565 | Published: Sep 3rd 2007)
169: Blood Sucking Critters
What do ticks, leeches, mites, fleas, beetles, flies, lampreys, catfish, bats and moths have in common? Well, they are unlikely to feature in most people's list of favourite animals, and they are also
(Author: Andrew Impey
| Word Count: 857 | Published: Sep 3rd 2007)
170: Top Five Ways To Use Your Extra Kidney
Like it or not, Reality TV Shows seem to be everywhere. Unless you are a TV pariah you will have no doubt experienced the joys of such shows as "Big Brother", "There's Something about Miriam", "Lapdan
(Author: Andrew Impey
| Word Count: 577 | Published: Sep 3rd 2007)
171: Useless Bits of Body
Chinese food - my favourite. I'm particularly partial to spare ribs, although I have often wondered why certain animals have bits which are considered "spare." It is often misquoted that women have on
(Author: Andrew Impey
| Word Count: 644 | Published: Sep 3rd 2007)
172: Cheltenham Festival '07
Cheltenham Science Festival takes place every year in the beautiful town of Cheltenham in Gloucestershire, UK. Science festivals. The sorts of events that are frequented by those who have been describ
(Author: Andrew Impey
| Word Count: 582 | Published: Sep 3rd 2007)
173: Effects on ionosphere
A solar eclipse causes a decrease in the critical frequency of E and F1 layer. The variation of critical frequency is approximately in phase with the optical eclipse. The ionization in E and F1 layer
(Author: Tymon Hytem
| Word Count: 459 | Published: Sep 3rd 2007)
174: Effect of magnetic field on radio waves
The radio waves traveling through the ionosphere possess kinetic energy. This kinetic energy is imparted to the free electrons. Thus these free electrons in the ionosphere are set to vibration. These
(Author: Tymon Hytem
| Word Count: 450 | Published: Sep 3rd 2007)
175: Effect of ionosphere on radio wave
The radio waves traveling through the ionosphere possess kinetic energy. This kinetic energy is imparted to the free electrons. Thus these free electrons in the ionosphere are set to vibration. These
(Author: Tymon Hytem
| Word Count: 450 | Published: Sep 2nd 2007)
176: Duct propagation
In troposphere under normal conditions the air pressure water vapor pressure and temperature reduces with the increase of height above earth. As a result of this the refractive index also reduces with
(Author: Tymon Hytem
| Word Count: 462 | Published: Sep 2nd 2007)
177: Critical frequency
Critical frequency is the maximum frequency of the radio wave which is returned from a layer for normal incident. In case the frequency of the radio wave exceeds the critical frequency the influence o
(Author: Tymon Hytem
| Word Count: 458 | Published: Sep 2nd 2007)
178: How to Throw an 80s Theme Party
So how fun would it be to go all out and throw an 80's theme party? Do you remember the days of the Rubik's Cube, Pac-Man, big hair bands, phrases like "totally awesome", and of course you can't forg
(Author: Don Crass
| Word Count: 449 | Published: Aug 26th 2007)
179: Hamsters Can Now Help Halt Identity Theft
The invention of a hamster-powered paper shredder seems a pretty harmless attempt to harness a bit of pet power to do our daily chores. On the contrary, says Neal Anthwal, we're staring into the abyss
(Author: Andrew Impey
| Word Count: 583 | Published: Aug 24th 2007)
180: Some Useless Bits of Body
It is often misquoted that women have one extra rib compared to men, a fallacy which is no doubt biblical in origin. Anatomically, both men and women have twelve pairs of ribs - the lowest two pairs,
(Author: Andrew Impey
| Word Count: 641 | Published: Aug 24th 2007)
181: Solar Panels to Power USA
There was a muffled outcry with a lot of coughing and some sniggering at the back earlier today as George Bush unveiled his country's plan to provide energy for the 21st Century - a huge solar array i
(Author: Andrew Impey
| Word Count: 663 | Published: Aug 24th 2007)
182: Concerts: Have Fun, Stay Safe
Even though the summer concert series are winding down, there's still things the smart music lover will want to consider before, during and after attending one of these events. These suggestions are m
(Author: Ron Berry
| Word Count: 989 | Published: Aug 23rd 2007)
183: Naruto -- Not Just Another Comic Story
Naruto is one of the most popular manga and anime series around. It features a young boy, Naruto, whose body actually contains the spirit of a fearsome nine-tailed fox that had been terrorizing his vi
(Author: Andrew Wills
| Word Count: 589 | Published: Aug 22nd 2007)
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