Instruction Manual

DESCRIPTION 2-21
MCC-545C PACKET DATA RADIO
12/2000
In an ELOS System, the higher the antenna the better. In general, every time the antenna height
is doubled the system gain will be increased by approximately 6 db.
ANTENNA HEIGHT VERSUS DISTANCE BETWEEN STATIONS
FIGURE 3.1
Antenna cable length must be kept as short as possible to minimize line losses. Try to maintain a
line loss between the antenna and the MCC-545C to less than 1 db. A table of cable loss (at 50
MHz) for various types of co-ax cable is given below for reference.
CABLE TYPE Loss/100 feet (db) Diam.
(Inches)
Weight/100 feet
(lbs.)
RG 223, RG 58 3.0 .211 3.4
RG 214, RG 8 1.8 .425 12.6
RG 17 1.2 .870 20.1
LDF4A-50 ½ inch heliax .48 .500 15.0
LDF5A-50 7/8 inch heliax .26 .875 33.0
Best Antenna Height
0
5
10
15
20
25
30
100 150 200 250 300 350 400 450 500
RANGE (mi)
Antenna Height (ft)
40 Mhz
45 Mhz
50 Mhz