'' We have reached late 1976 in our history of Radio Caroline in the seventies. The programmes of the new daytime service had been well-received but, unfortunately, the broadcast frequency was not a particularly suitable one. During the hours of darkness continental interference caused problems to the signal on 1562 kHz. Being close to a number of local stations on 1546 kHz (194 metres) also made it harder for some people to tune in. Radio Mi Amigo fans were also unhappy because of interference in the Benelux from a Hungarian station making it difficult for them to enjoy their station on 1187 kHz. Caroline engineers were aware of the problems and, in November '76, a test broadcast was put out on 962 kHz, 312 metres, although nothing came of it at the time. It was finally decided that Caroline and Mi Amigo should swap frequencies. Caroline would now use 1187 kHz (“259” metres), 24 hours a day, with the 10 kW transmitter, while Radio Mi Amigo would use the 50 kW transmitter on 1562 kHz (192 metres). This wavelength change took place on 12th December and was met with a mixed reaction from Caroline listeners. There was no doubt that the daytime audience was better served by 1187 than it had been by 1562 but at night the station was now on lower power than previously, and the difference in coverage was noticeable. This led to discussions about a further change.'' https://www.offshoreradio.co.uk/car78.htm