Life member ARRL and AMSAT-NA     

 

Coaxial Cable Design Information

Coaxial Cable Attenuation

Attenuation (dB per 100 feet)

MHz: 

30

50

100

146

150

440

450

1000

2400

 

RG-174

5.5

6.6

8.8

13.0

 

25.0

 

30.0

75.0

 

LMR-100A

3.9

5.1

 

8.8

8.9

15.6

15.8

 

 

 

RG-58A/U

2.5

4.1

5.3

6.1

6.1

10.4

10.6

24.0

38.9

 

LMR-200

1.8

2.3

 

3.9

4.0

6.9

7.0

 

16.5

 

RG-59

 

2.4

3.5

 

 

7.6

 

12.0

 

 

RG-8X

2.0

2.1

3.0

4.5

4.7

8.1

8.6

 

21.6

 

LMR-240

1.3

1.7

 

3.0

3.0

5.2

5.3

 

12.7

 

LMR-240 Ultra

1.3

1.7

 

3.0

3.0

5.2

5.3

 

12.7

 

RG-213

1.2

1.6

1.9

2.8

2.8

5.1

5.1

8.0

13.7

 

RG-214

1.2

1.6

1.9

2.8

2.8

5.1

5.1

8.0

13.7

 

LMR-400

0.7

0.9

 

1.5

1.5

2.7

2.7

 

6.6

 

LMR-400 Ultra

0.7

0.9

 

1.5

1.5

2.7

2.7

 

6.6

 

9086

 

 

1.4

 

 

2.8

2.8

 

 

 

9913

0.8

 

 

1.5

 

2.8

 

 

7.5

Values indicated are approximate

Power Capacity   (In watts 104F, 40C)

MHz: 

30

50

150

220

450

900

1500

2000

 

LMR-100A

230

180

100

80

60

40

30

25

 

RG-58U

400

300

160

 

80

 

 

 

 

LMR-200

1020

790

450

370

260

180

140

120

 

RG-59

500

400

250

 

 

 

 

 

 

RG-8X

350

280

150

 

80

 

 

 

 

LMR-240

1490

1150

660

540

380

260

200

170

 

LMR-240 Ultra 

1490

1150

660

540

380

260

200

170

 

RG-213

1800

1200

620

 

300

 

 

 

 

RG-214

1800

1200

620

 

300

 

 

 

 

LMR-400

2100

1700

1000

830

550

380

290

250

 

LMR-400 Ultra 

2100

1700

1000

830

550

380

290

250

 

9913

2200

1700

900

 

450

280

200

160

Values indicated are approximate

 Some popular 50 Ohm coax types

Type

Frequency
MHz

Power*
Watts

Loss dB
per 100 ft

Diameter
inches

Rel. cost

RG58

0-3000

45

15-20

0.2"

low

RG8/RG213

0-3000

190

9-10

0.4"

moderate

Belden 9913

0-1000

275

4-5

0.4"

moderate

Times LMR400

0-2000

350

3.5-4

0.4"

moderate

1/2" Alum.

0-3000

650

3-3.5

0.6"

moderate

1/2" Heliax

0-8000

900

2-2.5

0.6"

high

7/8" Heliax

0-5000

2,000

1.25-1.5

1.0"

high

* Typical at 1 GHz. (See text)


Some popular 75 Ohm coax types

Type

Frequency
MHz

Power*
Watts

Loss dB
per 100 ft

Diameter
inches

Rel. cost

           

RG59

0-3000

75

11-12

0.25"

low

RG11

0-3000

150

9-10

0.4"

moderate

CATV 0.5"

0-1000**

N/A

3-3.5

0.5"

moderate

CATV 0.75"

0-1000**

N/A

1.7-2.0

0.75"

moderate

*  Typical at 1 GHz. (See text)
** Some types have narrower frequency limits.

For more information on transmission lines please call Astron Wireless Technologies