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Old April 30th 06, 04:24 AM posted to rec.radio.amateur.antenna
Reg Edwards
 
Posts: n/a
Default A little more on missing degrees

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.
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Regards from Reg, G4FGQ
For Free Radio Design Software go to
http://www.btinternet.com/~g4fgq.regp
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