Grounding Considerations - GE MDS Master Station Technical Manual

Table 3-1. Signal Loss in Coaxial Cables (at 900 MHz)
RG-8A/U
1/2 inch HELIAX
7/8 inch HELIAX
1-1/4 inch HELIAX
1-5/8 inch HELIAX
Table 3-2. Signal Loss in Coaxial Cables (at 400 MHz)
Cable Type
RG-8A/U
1/2 inch HELIAX
7/8 inch HELIAX
1-1/4 inch HELIAX
1-5/8 inch HELIAX

3.5 Grounding Considerations

To minimize the chance of damage to the radio and connected equipment, a safety ground (NEC
Class 2 compliant) is recommended which bonds the Master Station, antenna system, and con-
nected data equipment to a single-point ground, keeping all ground leads as short as possible.
The Master Station should be grounded using the #6-32 screw and star washer provided for this
purpose on the rear panel.
The use of a lightning protector is also recommended where the antenna cable enters the equip-
ment building; bond the protector to the tower/mast ground, if applicable. All grounds and ca-
bling must comply with applicable codes and regulations.
MDS 05-6399A01, Rev. E
10 Feet
Cable Type (3 Meters)
0.85 dB
0.23 dB
0.13 dB
0.10 dB
0.08 dB
10 Feet
(3 Meters)
0.51 dB
0.12 dB
0.08 dB
0.06 dB
0.05 dB
Figure 3-2. Rear Panel Grounding Screw
MDS™ Master Station
50 Feet 100 Feet
(15 Meters) (30.5 Me-
ters)
4.27 dB 8.54 dB
1.15 dB 2.29 dB
0.64 dB 1.28 dB
0.48 dB 0.95 dB
0.40 dB 0.80 dB
50 Feet 100 Feet
(15 Me- (30.5 Me-
ters) ters)
2.53 dB 5.07 dB
0.76 dB 1.51 dB
0.42 dB 0.83 dB
0.31 dB 0.62 dB
0.26 dB 0.52 dB
200 Feet
(61 Meters)
17.08 dB
4.58 dB
2.56 dB
1.90 dB
1.60 dB
200 Feet
(61 Meters)
10.14 dB
3.02 dB
1.66 dB
1.24 dB
1.04 dB
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