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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.