We use 50 Ohm Cables in Cellular and WiFi Applications. That should agree with the impedance of the connections on the related gear. The following comes from L-Com … Not that I couldn’t have written it myself, but they did a good job and it came in one of their email bulletins today. Just as important as impedance 75 Ohm or 50 Ohm in coaxial cables is that same impedance matching to Antennas and Transceivers and any coupling or splitting devices. Also in order to have, for example, 50 Ohms, matching between an antenna and the feed line (50 ohm coaxial cable) the antenna needs to be resonant at the operating frequencies. That means it is as close as possible to being cut the right length for the frequencies to be used. That way the maximum possible signal is transmitted and received without unnecessary loss. This is also why it is important lately, with 4G LTE, because older antennas don’t have the new frequency bands in use. It is also important to pay attention to coax cable loss per foot at the intended frequencies. Too small of a diameter or cable and cable type being wrong can ruin your day and your week and your month … for cellular and WiFi systems. (Now comes the L-Com quoted part.)
50 Ohm and 75 Ohm values refer to the impedance of the coaxial cable. Impedance is a measure of resistance, in the cable, to the flow of electrical energy. There really is no “good” or “bad” impedance, just the right impedance for your application.
For 75 Ohm cable, the primary application is the transmission of a video signal. In the case of 50 Ohm cable, the two primary uses are for transferring data signals and, in the case of low-loss 50 Ohm cable, the transfer of RF signals in wireless networks.
Simply put, 75 Ohm is mainly used for images/video and 50 Ohm is used for wired and wireless network data signal transfer.
Alan Spicer Marine Telecom
+1 954 683 3426
communications @ marinetelecom.net