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Old March 9th 06, 01:40 AM posted to rec.radio.amateur.antenna
 
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Default Bend in xmission line


Alfred Lorona wrote:
Conventional wisdom cautions against sharp bends in open wire transmission
line. What is the practical/quantifiable effect of violating this rule?

How does the effect vary with the severity of the bend and does it vary with
the distance along the line at which the bend occurs?

Tnx es 73, AL.


Al,

I've had many real open wire lines, including one over 1000 feet long.

As Clark pointed out, at extermel high voltage levels a sharp bend can
cause corona problems. In critical systems like video it can cause
impedance bumps that might create faint ghosts in the picture. It make
cause impedance to change slightly.


Sharp bends make no noticable difference at all for amateur
applications, other than weakening the wire if it is a stiff solid wire
like copperweld.

I would never give a moments worry about it.

73 Tom