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 WHAT IS SIGNAL PROPAGATION ? (Antenna Installation)
 

Propagation:-

Every radio signal can be transmitted in one of two ways

(a) Directional Antennas

(b) Omni Antennas.

Direction antennas transmit signals in a specific path where as the Omni antennas transmit over a 360 degrees raidius.

Remember though UHF and VHF signals essentially travel in a "line of sight" however, signals can be distorted by (1) reflected (2) refracted (3) diffracted

Reflection:-

Radio waves can bounce off many objects. And many different frequencies behave differently such as the HF frequencies bouncing off the "F" layers in the ionosphere. Radio waves can bounce off buildings, mountains and other strange objects too. Sometimes the result can appear as a ghosting figure idential to the image on the TV. The weaker signal is being bounced off this object and the TV is picking up on it. Ghosting has no affect

 

Refraction:-

TRefraction happens when electromagnetic waves travel across an area of liquid of different density such as water, humidity or temperature in the atmosphere. The result is the wave form changes its pathway just like the straw in the water (photo above). High Frequency wave forms are disturb more than VHF or UHF. It particularly affects the frequencies used by AM radio and be more noticeable at night fall as the atmosphere cools. On AM radio it causes the signal to fade in or fade out.

Diffraction:-

Remember we mentioned that there is in general, a rule of "line of sight" for UHF and VHF frequencies... well, these signals can be diffractioned.

 

The effect of diffraction occurs when a signal passes the side of a large solid structure. The result is the signal is pulled towards the solid object.

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This page was last modified on 29 November 2010 and maybe out of date with regards to its information at the time of reading this article. The information above is only intended for use a guide and should not be 100% relied upon as a substitute for official manufacturer technical advice. Quality Electrics disclaims responsibility for any damage, claim, or liability any person may incur, whether caused by negligence or otherwise, as a result of anything contained in our articles.
 

 
 
 

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