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Gain describes the ratio of output to input level. In a receiver it can occur before or after digitisation and is often expressed in dB.

Gain describes direction and a reference, not an additional energy source.

Why maximum gain does not mean best reception, and how to check a receiving chain systematically.

Louder is not always clearer. Distinguish audio level, gain and overload.

Automatic Gain Control adjusts gain according to signal level, reducing differences between weak and strong signals at the output.

From antenna to audio: explore loss, gain, filtering and volume in an explicitly simulated receive chain.

Decibels express a ratio logarithmically. For power, use 10 · log₁₀(P₂/P₁), allowing gains and losses in a chain to be added.

Combine transmit power, feed-line loss and antenna gain.

Compact earphone microphone with adjustable microphone gain for the ID-52E Plus.

Follow transmit power, gains and losses to the receiver.

Its broad frequency range describes reception coverage; it does not establish uniform gain across the range or a transmit rating.

Transmit power and antenna gain do not enter the horizon calculation: they do not change geometric horizon, though they can affect whether a particular link is usable.