Re: Tesla Coil RF Transmitter

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Gary Peterson" <gary@xxxxxxxxxxxx>


> Original poster: "Antonio Carlos M. de Queiroz" <acmdq@xxxxxxxxxx>

> > Original poster: "Gary Peterson" <gary@xxxxxxxxxxxx>

> > The caption associated with the second animation doesn't say 
> > anything about the antenna being electrically short.  It looks to 
> > me like the thing is just drawn to a smaller scale than previously. . . .

> . . . The high reactance of the short antenna can be recognized
> in the animations by the electric field lines that form loops that grow
> and then return to the antenna instead of detaching and forming
> electromagnetic waves.

Thanks for explanation.  I'm not sure whether to believe it.

> > . . . Also, these animations represent the operation of a dipole 
> > "antenna" (in the sense used above) in free space. This is an 
> > inaccurate representation of the launching structure of a 
> > Tesla-coil transmitter, which is grounded and by my definition is 
> > NOT an "antenna."

> The pattern of a grounded antenna is just one half of the pattern of
> a dipole antenna, with some distortion due to the nonzero resistance
> of the ground.

That's fine for the nearfield, but please show me what the radiation 
pattern of a grounded quarter-wave monopole radio antenna looks as it 
transitions to the farfield.

> Antonio Carlos M. de Queiroz

Gary Peterson