What is an advantage of 50 ohm coax over 75 ohm?

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Multiple Choice

What is an advantage of 50 ohm coax over 75 ohm?

Impedance choice determines how power, voltage, and current behave on a transmission line. A 50-ohm line presents a lower impedance than 75 ohm, so for a given transmitter output voltage the line draws more current, delivering more RF power into the line. At the same time, the voltage swing on the line is lower than it would be into a higher-impedance line, which reduces voltage stress on the insulation and connectors. That combination—more current capability with lower voltage stress—makes 50-ohm coax a practical choice for transmitting higher power, which is why it’s favored for RF transmitter links. The other statements aren’t advantages: bandwidth differences aren’t an inherent benefit of 50 ohms, shielding issues can cause ground loops, and cost isn’t a performance-based advantage.

Impedance choice determines how power, voltage, and current behave on a transmission line. A 50-ohm line presents a lower impedance than 75 ohm, so for a given transmitter output voltage the line draws more current, delivering more RF power into the line. At the same time, the voltage swing on the line is lower than it would be into a higher-impedance line, which reduces voltage stress on the insulation and connectors. That combination—more current capability with lower voltage stress—makes 50-ohm coax a practical choice for transmitting higher power, which is why it’s favored for RF transmitter links. The other statements aren’t advantages: bandwidth differences aren’t an inherent benefit of 50 ohms, shielding issues can cause ground loops, and cost isn’t a performance-based advantage.

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