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Radio Caroline like many other broadcasters utilised Optimod sound processors to enhance sound output on most of their frequencies. In the early years whilst Caroline was primarily broadcasting as a single station service the Orban Optimod 9000A was their preferred choice of processor.

Developed in the 1980's by Bob Orban the Optimod processing unit was designed to compress the audio signal and process the signal prior to it being fed into the transmitters. This enabled the signal to become much more dense, permiting the signal to be broadcast much louder, whilst at the same time limiting noise issues.