Phoenix Contact 1340124 A coaxial cable with a 50 ohm impedance and a length of 5 meters is used to transmit signals over a frequency range from 800 MHz up to 7.25 GHz. The cable has an external diameter of 10.3 millimeters, indicating its physical dimensions. When transmitting at different frequencies, the signal's power is attenuated by varying amounts: at 800 MHz it decreases by approximately 0.8 dB, at 2.4 GHz by 1.4 dB, at 5.8 GHz by 2.2 dB, and at 7.25 GHz by 2.5 dB.