VHF/UHF/Microwave Notes



 
 

Figure 6 Fresnel Zone for a Radio Link


COAX / CABLE LOSSES

Cable Type 144 MHz 220 MHz 450 MHz 915 MHz 1.2 GHz 2.4 GHz 5.8 GHz
RG-58 6.2

(20.3)

7.4

 (24.3)

10.6

 (34.8)

16.5

 (54.1)

21.1

 (69.2)

32.2

 (105.6)

51.6

 (169.2)

RG-8X 4.7

(15.4)

6.0

 (19.7)

8.6

 (28.2)

12.8

 (42.0)

15.9

 (52.8)

23.1

 (75.8)

40.9

 (134.2)

LMR-240 3.0

(9.8)

3.7

 (12.1)

5.3

 (17.4)

7.6

 (24.9)

9.2

 (30.2)

12.9

 (42.3)

20.4

 (66.9)

RG-213/214 2.8

(9.2)

3.5

 (11.5)

5.2

 (17.1)

8.0

 (26.2)

10.1

 (33.1)

15.2

 (49.9)

28.6

 (93.8)

9913 1.6

(5.2)

1.9

 (6.2)

2.8

 (9.2)

4.2

 (13.8)

5.2

 (17.1)

7.7

 (25.3)

13.8

 (45.3)

LMR-400 1.5

(4.9)

1.8

 (5.9)

2.7

 (8.9)

3.9

 (12.8)

4.8

 (15.7)

6.8

 (22.3)

10.8

 (35.4)

3/8" LDF 1.3

(4.3)

1.6

 (5.2)

2.3

 (7.5)

3.4

 (11.2)

4.2

 (13.8)

5.9

 (19.4)

8.1

 (26.6)

LMR-600 0.96

(3.1)

1.2

 (3.9)

1.7

 (5.6)

2.5

 (8.2)

3.1

 (10.2)

4.4

 (14.4)

7.3

 (23.9)

1/2" LDF 0.85

(2.8)

1.1

 (3.6)

1.5

 (4.9)

2.2

 (7.2)

2.7

 (8.9)

3.9

 (12.8)

6.6

 (21.6)

7/8" LDF 0.46

(1.5)

0.56

 (2.1)

0.83

 (2.7)

1.2

 (3.9)

1.5

 (4.9)

2.3

 (7.5)

3.8

 (12.5)

1 1/4" LDF 0.34

(1.1)

0.42

 (1.4)

0.62

 (2.0)

0.91

 (3.0)

1.1

 (3.6)

1.7

 (5.6)

2.8

 (9.2)

1 5/8" LDF 0.28

(0.92)

0.35

 (1.1)

0.52

 (1.7)

0.77

 (2.5)

0.96

 (3.1)

1.4

 (4.6)

2.5

 (8.2)

Table 1 - Attenuation of Various Transmission Lines in Amateur and ISM Bands in dB/ 100 ft (dB/ 100 m)

Notes

Attenuation data based on figures from the "Communications Coax Selection Guide" from Times Microwave Systems (http://www.timesmicrowave.com/products/commercial/selectguide/atten/) and other sources.

The LMR series is manufactured by Times Microwave. 9913 is manufactured by Belden Corp. RG-series cables are manufactured by Belden and many others. The LDF series are foam dielectric, solid corrugated outer conductor cables, best known by the brand name HELIAX (®Andrew Corp.).