05-4055A01, Rev. E
MDS entraNET Technical Manual
155
For 900 MHz systems with cable runs of less than 20 ft/6m, an
inexpensive cable type such as Type RG-8A/U may be acceptable. For
longer runs, or for 2400 MHz systems, GE MDS recommends using a
low-loss cable type such as Andrew Corp. HELIAX
®
cable.
The choice of cable depends on the required length, cost considerations,
and the amount of signal loss you can tolerate.
Table 6-1
lists several
types of popular feedlines and indicates the signal losses (in dB) that
result when using various lengths of cable at 900 MHz.
Table 6-2
shows
the same data for 2400 MHz systems.
.
Maintaining Compliance at 900 MHz
(U.S.A. and Canada Only)
Table 6-3
outlines the minimum lengths of RG-214 coaxial cable that
must be used with common GE MDS omnidirectional antennas
to
maintain compliance with the FCC and IC maximum limit of
+36 dBm
for license-free 900 MHz systems.
Table 6-1. Length vs. Loss in Coaxial Cables at 900 MHz
Cable Type
10 Feet
(3.05 m)
50 Feet
(15.24 m)
100 Feet
(30.48 m)
500 Feet
(152.4 m)
LMR-400
0.39 dB
1.95 dB
3.90 dB
Unacceptable
Loss
1/2 inch HELIAX
0.23 dB
1.15 dB
2.29 dB
11.45 dB
7/8 inch HELIAX
0.13 dB
0.64 dB
1.28 dB
6.40 dB
1-1/4 inch HELIAX
0.10 dB
0.48 dB
0.95 dB
4.75 dB
1-5/8 inch HELIAX
0.08 dB
0.40 dB
0.80 dB
4.00 dB
Table 6-2. Length vs. Loss in Coaxial Cables at 2400 MHz
Cable Type
10 Feet
(3.05 m)
50 Feet
(15.24 m)
100 Feet
(30.48 m)
500 Feet
(152.4 m)
LMR-400
0.70 dB
3.50 dB
6.61 dB
Unacceptable
Loss
1/2 inch HELIAX
0.35 dB
1.73 dB
3.46 dB
17.3 dB
7/8 inch HELIAX
0.20 dB
0.99 dB
1.97 dB
9.85 dB
1-1/4 inch HELIAX
0.15 dB
0.73 dB
1.45 dB
7.50 dB
1-5/8 inch HELIAX
0.13 dB
0.63 dB
1.25 dB
6.25 dB
Table 6-3. Minimum Feedline Length versus Antenna Gain
(RG-214 coaxial cable)
Antenna Gain
(dBd)
Antenna Gain
(dBi)
Minimum Feedline
Length (Loss in dB)
Power Level
at Minimum Length
Unity (0 dB)
2.15
dBi
3 meters (1.0 dB)
+31.15 dBi
3 dBd
5.15 dBi
3 meters (1.0 dB)
+34.15 dBi
5 dBd
7.15 dBi
3.1 meters (1.2 dB)
+35.95 dBi
Summary of Contents for MDS entraNET 2400
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