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Antenna Type (Station)

Power (W)

Freq. (MHz)

H Field (mA/m)

%ANSI (1982)

%IEEE (1991)

Dipole ("160 meter") (I)

80

1.95

13-78

1-5

<1-1

Open-line, "modified T" (F)

500

1.95

37-307

2-19

<1-4

"Inverted V" dipole (G)

100

3.7

4-123

<1-10

<1-3

Horizontal loop (H)

100

3.7

18-130

1-10

<1-3

Vertical radiator (B)

800

3.8

140-1350

11-108

3-31

"Inverted V" dipole (F)

1400

3.8

20-69

2-6

<1-2

Center-fed dipole (E)

120

7.1

9-256

1-38

<1-11

"Inverted V" dipole (F)

1400

7.2

53-122

8-19

2-5

Vertical whip (roof-mt) (E)

140

14.1

12-28

4-8

4-8

Yagi (3 element) (I)

100

14.2

8-16

2-5

<1-1

Horizontal loop (H)

100

21.0

5-24

2-11

<1-3

Dipole (attic-mtd) (A)

100

21.2

10-70

4-31

1-9

Yagi (5 element) (B)

1000

21.2

40-50

18-22

5-7

"Half-sloper" Dipole (A)

100

28.2

20-90

12-53

3-16

Horizontal loop (H)

100

28.2

2-33

1-20

<1-6

Yagi (3 element) (D)

450

28.5

10-18

6-11

2-3

1/4-wave whip;vehicle-mt (D)

85+10

146.0

50-160

31-101

69-219

VHF Discone (attic-mt) (A)

250

146.5

40-60

25-38

55-82

TABLE 3: EXAMPLES OF MAXIMUM MAGNETIC FIELDS IN PUBLICLY ACCESSIBLE AREAS*

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __________ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

*"Publicly accessible" areas other than "ham shack" where persons other than the amateur operator could have reasonable access. However, some areas were very close-in to subject antennas, and persons would ordinarily not be present. These are maximum readings, and time-averaging aspects of exposure guidelines are not taken into account. IEEE (1991) limits used are those for "uncontrolled environments" (IEEE C95.1-1991 has been adopted by ANSI and designated ANSI/IEEE C95.1-1992).

10

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