[TenTec] Antenna measurements

[Steve Hunt]

This is the concise statement I have in my (very) old course notebook:

Static charge ->  electric field
Moving charge (non-accelerating) -> magnetic field
Accelerating or decelerating charge -> EM radiation


73,
Steve G3TXQ



On 23/04/2013 21:44, Stuart Rohre wrote:
> Yes, that case of an accelerating current would radiate per the 
> acceleration criteria in 2nd Edition of Kraus.  One type of current 
> that would be accelerating is a simple harmonic oscillation.  The 
> harmonic oscillation, like a sine wave, has changes of direction.
>
> A stationary charge does not radiate he states.
>
> Note the other example, (counter example) a uniform current at 
> constant velocity in a straight wire, (non oscillating) does not radiate.
>
> In my Kraus, this part of Chapter 2 is section 2-27
>
> Interesting that ed. 3 is so different.  I would think something like 
> mine would be in the first 50 pages or so of your book.
>
> However, I have seen books like the old ARRL Handbooks start right in 
> with wave theory of the E and H field, and never really say what is 
> the process of radiation, other than it happens from an antenna.
>
> -Stuart
> K5KVH
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