Comparison of the attenuation of the cables 50 and 75 Ohm for frequencies 2-2. 8 Hz
In this video, we have measured attenuation for cables from several selected manufacturers. Measurements were made using a spectrum Analyzer with a tracking generator Rohde & Schwarz FSH6 (100 kHz — 6 GHz). According to the results of measurements, the least attenuation was shown by the cable produced in China.
Various cables with a length of 20 meters were used for testing, namely:
1) Strong RG-Sat 50,
2) Strong RG6U 96%,
3) Cavel Sat 703,
4) Radiolab 5DFB,
5) Multipin 5DFB.
Attenuation at 2000 MHz and 2800 MHz in dB. The results of the measurements are:
| Cable mark | Attenuation 2000 MHz | Attenuation 2800 MHz |
|---|---|---|
| Strong RG-Sat 50 | 4,9 dB | 5,1 dB |
| Strong RG6U 96% | 5,8 dB | 6.3 dB |
| Cavel Sat 703 | 5,3 dB | 5,8 dB |
| Radiolab 5DFB | 5.4 dB | 6,7 dB |
| Multipin 5DFB | 5,7 dB | 6,9 dB |
As we see from the results of the experiment, the smallest attenuation of cable №1 is Strong RG-Sat 50. The parameters of the cable itself are as follows: the central core of 1.13 mm is copper, the screen is aluminum foil + braid of 64 copper-clad aluminum cores — 0.12 mm, dielectric 4.8mm - physically foamed polyethylene, PVC - 6.8 mm high grade, frost-resistant with a red stripe, wave resistance 75 Ohm. Since the test showed that the attenuation of a cable with a wave resistance of 75 Ohm is less than that of the Radiolab 5DFB, we can safely say that a cable with a wave resistance of 75 Ohm is no worse than a cable with a wave resistance of 50 Ohm.