I measured the resistance for 15 meters RG6 cable, which showed 3 ohms on my multimeter ! I've got 0.7 ohms resistance on the multimeter itself when touching the negative and positive. So 3 ohms - 0.7 ohms makes 2.3 ohms absolute value for 15 meters RG6. Now for 300 meters / 15 meters = 20 times longer. 20 times the ohms would be = 2.3 * 20 = 46 ohms for 300 meters cable OR 92 ohms for 600 meters. How dare these people grade this cable RG6 if it should be 75 ohms per 1000 meters ?
Is this correct what I am calculating or I do mistake somewhere?
Edit: I was touching the copper only on both sides.
Edit2: I'm testing this because : I learned that some people have tested wifi over coax in the past at 2.4 Ghz, 22 dBm and with RG6 cable successfully got RSSI of -9 at the 64th meter of the cable. Nobody explains what happens after the 64th meter..
I have 2W 2.4 Ghz amplifier. So I wanted to make rough calculation and see how far I can reach with the same cable and get decent RSSI. If you look at the charts for attenuation for RG6 it says ~34 dB loss @ 2.4 Ghz at 100m, which makes no sense of what I found as Ohm resistance and calculations. This ~34 dB loss seems way too much because if 2W are 33 dBm this means at 100m the signal will be totally gone ? What am I missing?
I went to the simple path that this amplifier should be in fact nothing more than Direct Current on the RF out. My calculations show 500-550mW loss each 100m of RG6 without considering Ghz but DC. At 300m I will be left only with 100-200mW (which is 20-21 dBm) and possibly still decent RSSI.
What your calculation show ? I guess you'll take different path of calculations. How far 2W @ 2.4 Ghz and RG6 ?