(radio slang)
An amplifier used after the transceiver output. So named for its purity of amplification.
Linear, in the mathematical sense, means that what comes out is directly proportional to what goes in. As far as
linear amps go, if you double the input, the output is doubled and so on. This does not generate any additional frequency byproducts. If the amp is
nonlinear, sums, differences and all combinations of those are generated also.