Advanced Marine Electrics and Electronics Troubleshooting A Manual for Boatowners and Marine Technicians

188 marine electronics installation and troubleshooting

Radar Height Target Height (H 0 , ft.)

(H 1 , ft.) 0 1 2 3 5 10 15 20 30

5 14 11 8 5 —— —— —— —— ——

10 27 25 22 19 14 —— —— —— ——

15 41 38 36 33 27 14 —— —— ——

20 55 52 49 47 41 27 14 —— ——

25 69 66 63 60 55 41 27 14 ——

30 82 80 77 74 69 55 41 27 ——

40 110 107 104 102 96 82 69 55 27

50 137 135 132 129 124 110 96 82 55

Reprinted with permission from Boatowner’s Illustrated Electrical Handbook, second edition, by Charlie Wing

Radar Near Range (Blind Zone), N 1 , in Feet

TABLE

16-8

Satellite

VHF GPS SSB Radar (4 kW) Communications Cell Phone Satellite TV

VHF 43 3 2 6 2 3

GPS 3 0.5 4 vertical separation; 6 (and vertical 5 2

GPS out of radar separation; GPS

beam below satcom)

SSB 34 10 3 6 2 4

Radar 2 vertical 2 1.5 vertical 6 cell out of 4 (more for

(4 kW) separation; separation radar beam higher-power

GPS out radar)

of radar

beam

Satellite 6 6 (and 6 6 6 6 6

Commu- GPS

nications below

satcom)

Cell 2 5 2 cell out of 6 3 4

Phone radar beam

Satellite 3 3 4 4 (more for higher- 6 4 4

TV power radar)

Source:NMEA

Recommended Horizontal Antenna Spacing (in feet, with vertical spacing where

required)

TABLE

16-9