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Old April 30th 06, 04:12 PM posted to rec.radio.amateur.antenna
Frank's
 
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Default A little more on missing degrees

"Reg Edwards" wrote in message
...
I havn't much idea on what the present argument is all about. And I
have no wish to take sides.

But -

If Line-1 has impedance Zo1 and is a fractional wavelength L1 long,

and Line-2 has impedance Zo2 and is a fractional wavelength L2 long,

then when both lines are connected together and are brought into
so-called 1/4-wave resonance by pruning the length of one of the
lines, it is IMPOSSIBLE for L1 + L2 to equal 1/4-wavelength or 90
degrees.

There are ALWAYS some degrees "missing" - depending on the ratio
Zo1/Zo2.

Except only when Zo1 = Zo2 will L1 + L2 total 90 degrees.

Can be proved mathematically without invoking standing or reflected
waves. You just have to believe in mathematics.

Line-1, of course, is a loading coil and Line-2 is a whip.

I hope this settles an argument.

For a demonstration download program TWOLINES from website below.


I don't understand the argument either. Why would anyone care
how many degrees an antenna has; it radiates all the power
whatever its length.

Frank