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6 |
Feedlines
The choice of feedline used with the antenna should be carefully considered.
For 900 MHz systems with cable runs of less than 20 ft./6m, an inexpensive cable type such as Type
The choice of cable depends on the required length, cost considerations, and the amount of signal loss that can be tolerated. The table below lists several types of popular feedlines and indicates the signal losses (in dB) that result when using various lengths of cable at 900 MHz.
| 10 Feet | 50 Feet | 100 Feet | 500 Feet |
Cable Type | (3.05 m) | (15.24 m) | (30.48 m) | (152.4 m) |
0.39 dB | 1.95 dB | 3.90 dB | Unacceptable Loss | |
1/2 inch HELIAX | 0.23 dB | 1.15 dB | 2.29 dB | 11.45 dB |
7/8 inch HELIAX | 0.13 dB | 0.64 dB | 1.28 dB | 6.40 dB |
0.10 dB | 0.48 dB | 0.95 dB | 4.75 dB | |
0.08 dB | 0.40 dB | 0.80 dB | 4.00 dB |
. The next table shows the same data for 2400 MHz systems.
| 10 Feet | 50 Feet | 100 Feet | 500 Feet |
Cable Type | (3.05 m) | (15.24 m) | (30.48 m) | (152.4 m) |
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 |
0.15 dB | 0.73 dB | 1.45 dB | 7.50 dB 1 | |
0.13 dB | 0.63 dB | 1.25 dB | 6.25 dB |
| Chapter 6 Installation |