MDS TransNET 900 Specifications download pdf (Page 21)

MDS 05-2708A01, Rev. E MDS TransNET Ref. Manual 11

Table 2 lists several types of feedlines and indicates the signal losses (in dB)

that result when using various lengths of each cable at 900 MHz and Table 3

for 2.4 GHz. The choice of cable will depend on the required length, cost

considerations, and the amount of signal loss that can be tolerated.

Antenna System Ground

Precautions should be taken to assure the antenna and its support structure are

bonded to a good earth ground system to minimize the impact of voltages

created by lightning and atmospheric charges.

CAUTION: Safety grounding systems are beyond the scope of this manual. Below you

will find some elementary advice. These are generalities; every location and

installation is unique and requires a unique safety grounding system design.

Please consider consulting a radio system engineer or other professional for

advice or ground system design. A well-designed ground system will mini-

mize risk of electrical shock to personnel and the chances of equipment

damage.

Table 2. 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)

300 Feet

(91.44 Meters)

LMR 400 0.39 dB 1.95 dB 3.9 dB Unacceptable

Loss

1/2 inch

HELIAX

0.23 dB 1.15 dB 2.29 dB 6.87 dB

7/8 inch

HELIAX

0.13 dB 0.64 dB 1.28 dB 3.84 dB

1-1/4 inch

HELIAX

0.10 dB 0.48 dB 0.95 dB 2.85 dB

1-5/8 inch

HELIAX

0.08 dB 0.40 dB 0.80 dB 2.4 dB

Table 3. Length vs. loss in coaxial cables at 2400 MHz

Cable Type

10 Feet

(3.05 Meters)

50 Feet

(15.24 Meters)

100 Feet

(30.48 Meters)

300 Feet

(91.44 Meters)

LMR-400 0.70 dB 3.50 dB 6.61 dB Unacceptable

Loss

1/2 inch

HELIAX

0.35 dB 1.73 dB 3.46 dB 17.3 dB

7/8 inch

HELIAX

0.20 dB 0.99 dB 1.97 dB 9.85 dB

1-1/4 inch

HELIAX

0.15 dB 0.73 dB 1.45 dB 7.50 dB

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MDS TransNET 900 Specifications Page 21

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