How is AC voltage separated from RF signal in a distribution amplifier?

The method of separating AC voltage from RF signals in a distribution amplifier involves the use of a capacitor that blocks low-frequency AC voltage. This is because capacitors are designed to allow high-frequency signals, such as the RF signals, to pass through while blocking lower-frequency AC signals.

In this context, the RF signals, which may include television or radio frequencies, typically operate at much higher frequencies than standard AC voltage. The capacitor effectively creates a high-pass filter, allowing the RF signals to continue to propagate while preventing the lower-frequency AC currents from passing. This ensures that the integrity of the RF signal is maintained and that any unwanted AC voltage does not interfere with the signal that needs to be amplified.

Transformers, while potentially useful in other applications, are typically employed to isolate different voltage levels or to match impedance rather than for the specific separation of AC and RF signals within a distribution amplifier. Resistors are not effective for this purpose as they would dissipate power rather than provide a separation. Relays are used for switching applications, not for frequency separation. Thus, the use of a capacitor is the most effective method for achieving the desired separation in this context.