Installation Procedures - GE MDS 4790 Series Installation & Operation Manual

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losses as low as possible and certainly under 3 dB. Remember that for
each 3 dB of feedline loss, half the transmitter power is lost, and twice
the receive signal power is needed to produce the same signal-to-noise
ratio.
The RG-8A/U cable is a widely available and inexpensive feedline that
is suitable for systems with short ranges or those with short feedlines.
For longer feedlines and lower losses, Andrew HELIAX
coaxial cable or similar products are a good choice.
length of various types of cable and the resulting degradation in signal
strength.
Mount the antenna and feedline securely to the supporting structure to
avoid damage from wind and ice loading. Follow the instructions pro-
vided by the antenna and feedline manufacturers to ensure a safe and
reliable installation.
Table 2. Feedline Loss Chart (450 MHz)
3.05 Meters
Cable Type (10 Feet)
RG-8A/U 0.51 dB
1/2 in. HELIAX 0.15 dB
7/8 in. HELIAX 0.08 dB
1-1/4 in. HELIAX 0.06 dB
1-5/8 in. HELIAX 0.05 dB
Table 3. Feedline Loss Chart (960 MHz)
3.05 Meters
Cable Type (10 Feet)
RG-8A/U 0.85 dB
1/2 in. HELIAX 0.23 dB
7/8 in. HELIAX 0.13 dB
1-1/4 in. HELIAX 0.10 dB
1-5/8 in. HELIAX 0.08 dB

4.0 INSTALLATION PROCEDURES

This section presents the steps necessary for installing the radio and con-
necting it to associated equipment. After completing these steps, the
radio is ready for in-service operation.
MDS 4790/9790 Series I/O Guide
Table 2
15.24 Meters 30.48 Meters
(50 Feet) (100 Feet)
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
15.24 Meters 30.48 Meters
(50 Feet) (100 Feet)
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
MDS 05-3438A01, Rev. F
™
semi-rigid
shows the
152.4 Meters
(500 Feet)
25.35 dB
7.55 dB
4.15 dB
3.10 dB
2.60 dB
152.4 Meters
(500 Feet)
42.70 dB
11.45 dB
6.40 dB
4.75 dB
4.00 dB