[Uram-rejections] How does radiation come about?

[webstump+uram-bounces at chiark.greenend.org.uk]

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The post that you submitted to uk.radio.amateur.moderated has been rejected by a
moderator. 

This post repeats a recent post or a recent query without appearing to
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============================================ Full text of your message follows
> From webstump at chiark.greenend.org.uk Tue Apr 24 14:59:42 2018
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> From: Ian Clifton <ian.clifton at chem.ox.ac.uk>
> Newsgroups: uk.radio.amateur.moderated
> Subject: Re: How does radiation come about?
> Date: Tue, 24 Apr 2018 14:59:41 +0100
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> Gareth's Downstairs Computer
> <headstone255.but.not.these.five.words at yahoo.com> writes:
> 
> > On 23/04/2018 15:04, David Woolley wrote:
> >> On 23/04/18 13:14, Gareth's Downstairs Computer wrote:
> >>> One thing that has puzzled me for years is the lack of a
> >>> pictorial explanation of what happens when RF is radiated.
> >>>
> >>> What is it that stops the now-radiated energy from collapsing
> >>> back into the antenna along with the near field?
> >>
> >> The light speed limit.  The fact that the field is collapsing can
> >> only propagate at the speed of light, so, by the time the far field
> >> finds out, the near field is growing again.
> >
> > Is it due to the field increasing in the next half cycle being of
> > opposite direction repelling the expanding field?
> 
> Many years ago at Uni I had the chance to do a course module on
> Maxwell’s equations, but for some reason (possibly a timetabling clash)
> I didn’t—I did the gyroscope instead (with Gerry Wickham who
> <fame claim>used to set the puzzles on the Krypton Factor</fame claim>)
> -- 
> Ian ◎
> 
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