Quadrant amplitude is used to do what?

Quadrant amplitude is used to do what?

• A. Combine two AM signals into a single channel
• B. Increase the amplitude of a single AM signal
• C. Convert AM to FM
• D. Filter AM signals

Answer: (A)

Quadrature amplitude modulation uses two carriers that are 90 degrees out of phase to carry two independent signals in the same frequency band. Each signal modulates its own carrier, and the two modulated streams are then combined into one RF signal. The sine and cosine components are orthogonal, so they can be separated again at the receiver. This lets you put two AM signals into a single channel, effectively increasing how much information you can send without needing extra bandwidth. The other options describe different actions (raising amplitude of one signal, changing to FM, or filtering) that don't involve using two orthogonal components to share a channel.

Quadrature amplitude modulation uses two carriers that are 90 degrees out of phase to carry two independent signals in the same frequency band. Each signal modulates its own carrier, and the two modulated streams are then combined into one RF signal. The sine and cosine components are orthogonal, so they can be separated again at the receiver. This lets you put two AM signals into a single channel, effectively increasing how much information you can send without needing extra bandwidth. The other options describe different actions (raising amplitude of one signal, changing to FM, or filtering) that don't involve using two orthogonal components to share a channel.