Dc Power Connection; Grounding Considerations - GE MDS SD Series Reference Manual

16 SD Series Ref. Manual (Packet & Transparent Mode)
Table 5. Length vs. Loss in Coaxial Cables (at 960 MHz)
Cable Type
RG-8A/U
1/2 inch HELIAX
7/8 inch HELIAX
1-1/4 inch HELIAX
1-5/8 inch HELIAX

4.3 DC Power Connection

The transceiver may be operated from any well-filtered 10.0 to 30 Vdc
power source. The supply must be capable of providing at least 2.5
Amperes of continuous current.
NOTE: Early SD4 models supported 10.5 to 16 Vdc power, not 10 to
30 Vdc. Check the labeling above the power connector to
confirm the operating range for your unit.
A power connector with screw-terminals is provided with each unit (see
Figure 14). Strip the wire leads to 6 mm (1/4 inch) and insert in the wire
ports. Be sure to observe proper polarity as shown in Figure 14.
Wire Ports (2)
(Polarity: Left +, Right –)
Figure 14. DC Power Connector (P/N 73-1194A39)
NOTE: The radio is designed for use in negative ground systems only.

4.4 Grounding Considerations

To minimize the chance of damage to the transceiver and connected
equipment, a safety ground (NEC Class 2 compliant) is recommended
which bonds the antenna system, transceiver, power supply, and con-
nected data equipment to a single-point ground, keeping all ground leads
as short as possible.
10 Feet 50 Feet
(3.05 Meters) (15.24 Meters)
0.85 dB 4.27 dB
0.23 dB 1.15 dB
0.13 dB 0.64 dB
0.10 dB 0.48 dB
0.08 dB 0.40 dB
Invisible place holder
100 Feet 200 Feet
(30.48 Meters) (61 Meters)
8.54 dB 17.08 dB
2.29 dB 4.58 dB
1.28 dB 2.56 dB
0.95 dB 1.90 dB
0.80 dB 1.60 dB
Lead
Binding
Screws (2)
Retaining
Screws (2)
MDS 05-4846A01, Rev. C