Recently, we received several inquiries about 75-ohm connectors and 75ohm coaxial cable assemblies Here, let us simply define the difference between 50ohm and 75ohm cable assembly.
An ohm is the standard unit used in the international system of measurements to measure resistance, represented by the Greek letter omega (Ω). Ohms are also used, when multiplied by imaginary numbers, to signify reactance in AC and RF applications.
Alternating current is of vital importance in electronics for one simple reason: The electric current you can access by plugging a circuit into a wall outlet happens to be alternating current.
In electricity, when charge carriers in a conductor or semiconductor periodically reverse their direction of movement, alternating current (AC) happens. Household utility current in most countries is AC with a frequency of 60 hertz (60 complete cycles per second), although in some countries it is 50 Hz. The transmission lines and radio-frequency ( RF ) current in antennas are other examples of AC.
Everything in our tech-driven society uses Alternating Current in the form of Radio Frequency (RF) energy. For example, AM radio station operates at a frequency of around 1 (MHz) or 1-million cycles per second, and the cell phone may operate at 900 MHz or 900-million cycles per second. We have to have a medium of some sort that can deal with the complex interaction of resistance, inductance, and capacitance to properly transmit these high-frequency RF signals, which need the coax cable in the most RF application.
Over time, the industry determined on two characteristic coaxial cable impedances for the vast majority of applications (>90%): 50 Ohm and 75 Ohm.
50 Ohm Coaxial Cables are very widely and is the best compromise solution; offering high power handling AND low attenuation characteristics. Any device that functions as a transmitter or transceiver tends to use 50 Ohm Coaxial Cable, such as CB/Ham Radios, Broadcast Radio/TV Transmitters, Wi-Fi and Cellular Phone Repeaters and 2-Way Radios (Walkie Talkies). During our RF cable assemblies, you can see that we offer a lot of 50ohm Coaxial Cable solutions, Liking RG58, KSR195, RG174, RG316, KSR 400 and so on.
But, 50 Ohm Coaxial Cables is not suitable for every application as not every project needs high power handling. If you'd like to lose very little signal strength when the signal gets through the cable in the most efficient way, then 75 Ohm coaxial cable is a good choice in the application for Satellite and Cable TV Receiver Boxes, High Definition Televisions, AM/FM Radio Receivers, and Police Scanners. Superbat offer RG179, RG59, 1855A, 1694A RF Coax cables with BNC connectors for the analog and digital video applications, and also provide the RG-6 Coaxial Cable with Type F Connectors used for cable and satellite TV applications.
Normally, the Impedance of all the devices being connected as well as the Coaxial Cable itself must match. It means that 75 Ohm coaxial cable must be connected with 75om the connectors on the coaxial cable if connecting a 75 Ohm video camera connected to the device. If not match, then the standing wave comes, fox example, between a 50 Ohm Coaxial Cable and a 75 Ohm Coaxial Connector (i.e. BNC). It has about 5% of the signal lost at a time when it is not matched. You may know, all of our coaxial cables offered always have the proper impedance matched connectors. Welcome to create your cable on our website for your projects. If any other questions, feel free to contact us.