Dc Power Connection - GE MDS SD4A Technical Manual

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Table 3, Table 4, and Table 5 show the approximate losses that will
occur when using various lengths and types of coaxial cable in the 200,
400 and 960 MHz bands, respectively. Regardless of the type used, the
cable should be kept as short as possible to minimize signal loss.
Table 3. Signal Loss in Coaxial Cables (at 200 MHz)
Cable Type
RG-8A/U
1/2 inch HELIAX
7/8 inch HELIAX
1-1/4 inch HELIAX
1-5/8 inch HELIAX
Table 4. 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
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 continuously.
NOTE: Early SD4 models supported 10.5 to 16 Vdc power, not 10 to
30 Vdc. Always check the labeling above the power connector
to confirm the operating range for your unit.
SD Series Technical Manual
10 Feet 50 Feet
(3 Meters) (15 Meters)
0.26dB 1.27 dB
0.06 dB 0.38 dB
0.04 dB 0.21 dB
0.03 dB 0.16 dB
0.025 dB 0.13 dB
10 Feet 50 Feet
(3 Meters) (15 Meters)
0.51dB 2.53 dB
0.12 dB 0.76 dB
0.08 dB 0.42 dB
0.06 dB 0.31 dB
0.05 dB 0.26 dB
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
100 Feet 200 Feet
(30.5 Meters) (61 Meters)
2.5 dB 5.07 dB
0.76 dB 1.6 dB
0.42 dB 0.83 dB
0.31 dB 0.62 dB
0.26 dB 0.52 dB
100 Feet 200 Feet
(30.5 Meters) (61 Meters)
5.07 dB 10.14 dB
1.51 dB 3.02 dB
0.83 dB 1.66 dB
0.62 dB 1.24 dB
0.52 dB 1.04 dB
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
MDS 05-4846A01, Rev. F