TenTec
[Top] [All Lists]

[TenTec] This is getting boring

To: <tentec@contesting.com>
Subject: [TenTec] This is getting boring
From: AC5E@aol.com (AC5E@aol.com)
Date: Wed, 4 Sep 2002 08:12:31 EDT
Gyro rotation, first described by Micheal Faraday,  is clearly described in 
almost any standard radio engineering textbook. To quote from Terman's Radio 
Engineers Handbook, 1943 edition: Page 711, first paragraph: 

"The electrons in the ionosphere exist in the presence of the earth's 
magnetic field. Such a magnetic field exerts a force on a moving electron 
that is proportional to the instantaneous velocity of the electron, and to 
the component of the magnetic field at right angles to the direction of 
motion. The direction of this force is at right angles to the direction of 
motion of the electron, and to the component of the magnetic filed producing 
the deflecting effect. (follows an extended description of gyro frequency and 
its effect on electrons and radio waves that propagate in an ionized medium.) 
This trend continues until at a frequency termed the gyro frequency and 
having a value of approximately 1.4 mc (mHz), the electron vibrates in a 
spiral path... in which the velocity becomes increasingly great...."

"It will be noted that in all cases where the magnetic filed of the earth has 
an influence, the effect is to cause the vibrating electrons to have some 
motion at right angles to the direction of vibration that would exist in the 
absence of a magnetic field. The polarization of the fields reradiated by the 
vibrating electrons will hence differ from that of the passing wave, causing 
the polarization to be affected by the presence of the earth's magnetic 
field." 

Terman continues at length, through page 723, with an extended explanation 
and mathematical explication of what I have already stated more briefly. I 
commend anyone who really wants to know to a book on propagation - with the 
observation that it would be well to make at least a brief survey of optics, 
since it seems some confusion between the behaviour of light "wavicles" and  
UHF and VHF radio waves has arisen. 

And for my part enough is enough.

73 Pete Allen  AC5E

<Prev in Thread] Current Thread [Next in Thread>