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Home Radio-frequency Transmission Lines Useful Transmission-line Configurations Four Wire Four-wire Unbalanced Feeder
 
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Four-wire Unbalanced Feeder

Author: Edmund A. Laport

This type of feeder (Fig. 4.12) is similar in application to type IX. It is more economical to build if two high-potential wires are attached to a single pin insulator because no crossarm is needed. The grounded wires can be fastened to the pole. A practical construction for this line is shown in

FIG. 4.13. Construction for type X feeder. This is an excellent type of feeder to use for low-power broadcast stations where extreme economy is essential. .

Fig. 4.13. If h » a, b, c,

When ρ1 = ρ2,

page_351_400-87.png

page_351_400-88.png

The electrical characteristics for two practical configurations are tabulated here:

ρ (inches) h (inches) a (inches) b (inches) c (inches) d (inches) k Z0 (ohms)

0.064

144

4.25

2.50

5.00

5.55

-0.655

235

0.064

144

6.00

2.50

12.0

8,00

-0.643

251

Home Radio-frequency Transmission Lines Useful Transmission-line Configurations Four Wire Four-wire Unbalanced Feeder

Last Update: 2011-03-19