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card_76138.txt
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1991-04-08
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1KB
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38 lines
-- card: 76138 from stack: in
-- bmap block id: 0
-- flags: 4000
-- background id: 4601
-- name: #265
----- HyperTalk script -----
on openCard
global group,rightone
put 23 into group
put "B" into rightone
pass openCard
end openCard
-- part contents for background part 20
----- text -----
Question #23
-- part contents for background part 1
----- text -----
3BI-6.3 How does the proximity to the ground affect the radiation pattern of a horizontal dipole HF antenna?
-- part contents for background part 11
----- text -----
If the antenna is too far from the ground, the pattern becomes unpredictable
-- part contents for background part 27
----- text -----
If the antenna is less than one-half wavelength from the ground, reflected radio waves from the ground distort the radiation pattern of the antenna
-- part contents for background part 28
----- text -----
A dipole antenna's radiation pattern is unaffected by its distance to the ground
-- part contents for background part 29
----- text -----
If the antenna is less than one-half wavelength from the ground, radiation off the ends of the wire is reduced