User Manual

12 SD Series Reference Manual (x710 Mode) MDS 05-4670A01, Rev. E
4.4 DC Power Connection
Power the transceiver from any well-filtered 10.0 to 30 Vdc power
source. The supply must be capable of providing at least 2.5 A of con-
tinuous 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 11). 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 11.
Figure 11. DC Power Connector (P/N 73-1194A39)
NOTE: The radio is designed for use in negative ground systems only.
Table 3. Signal Loss in Coaxial Cables (at 400 MHz)
Cable Type
10 Feet
(3.05 Meters)
50 Feet
(15.24 Meters)
100 Feet
(30.48 Meters)
200 Feet
(60.96 Meters)
RG-8A/U 0.51 dB 2.53 dB 5.07 dB 10.14 dB
1/2 inch HELIAX
0.12 dB 0.76 dB 1.51 dB 3.02 dB
7/8 inch HELIAX
0.08 dB 0.42 dB 0.83 dB 1.66 dB
1-1/4 inch HELIAX
0.06 dB 0.31 dB 0.62 dB 1.24 dB
1-5/8 inch HELIAX
0.05 dB 0.26 dB 0.52 dB 1.04 dB
Table 4. Length vs. Loss in Coaxial Cables (at 900 MHz)
Cable Type
10 Feet
(3.05 Meters)
50 Feet
(15.24 Meters)
100 Feet
(30.48 Meters)
200 Feet
(60.96 Meters)
RG-8A/U 0.85 dB 4.27 dB 8.54 dB 17.08 dB
1/2 inch HELIAX
0.23 dB 1.15 dB 2.29 dB 4.58 dB
7/8 inch HELIAX
0.13 dB 0.64 dB 1.28 dB 2.56 dB
1-1/4 inch HELIAX
0.10 dB 0.48 dB 0.95 dB 1.90 dB
1-5/8 inch HELIAX
0.08 dB 0.40 dB 0.80 dB 1.60 dB