User's Manual

Date Code 20091009 SEL-3031 Instruction Manual
Installation
Connections
2.7
Antenna System Ground
Antenna system grounding is not included in the scope of this manual. Please consult a
radio systems engineer or other professional for advice on ground-system design. A
well-designed system will minimize equipment damage and risk of electric shock to
personnel.
Chassis Ground
Connect the grounding terminal labeled GND on the rear panel to a rack frame
ground or main station ground for proper safety and performance. Use 4 mm
2
(12 AWG) or heavier wire less than 2 meters (6.6 feet) in length for this
connection. The ground connection should be made before the power connections.
Connections
Rear-Panel Connections
The physical layout of the SEL-3031 connections is shown in Figure 2.3.
Figure 2.3 Wall-Mount and Rack-Mount Rear Connections
7/8-inch
HELIAX
Do not use 0.64 dB 1.28 dB 3.84 dB
1-1/4-inch
HELIAX
Do not use Do not use 0.95 dB 2.85 dB
1-5/8-inch
HELIAX
Do not use Do not use 0.80 dB 2.4 dB
Table 2.3 Length vs. Loss in Coaxial Cables at 900 MHz (Sheet 2 of 2)
Cable Type
3.05 Meters
(10 Feet)
12.24 Meters
(50 Feet)
30.48 Meters
(100 Feet)
91.44 Meters
(300 Feet)