He remembers his dad, a radio enthusiast, tuning into the BBC World Service and Voice of America. "I was fascinated by listening to all these stations from far away."
By the time he was eight, he was building his own radios. He quickly became a fan of the original LM Radio — which he would re-broadcast from a homemade transmitter on medium wave to the rest of Fish Hoek, where he lived.
Enthralled by pictures of the palms and beaches of the old Lourenço Marques, "I used to imagine LM as a sort of island paradise," he says. "It captured the imagination." He loved the '60s pop and rock it played — including the Beatles, Rolling Stones, Beach Boys and Manfred Mann.
The music was completely different to the SABC's "very sanitised" fare: "Anything that had any sort of sexual or revolutionary innuendo was completely banned" by the state broadcaster.
Across the border — and beyond South Africa's censorious jurisdiction — LM Radio was able to play banned music, including songs by black South African and African-American artists, as well as those who publicly opposed apartheid.
Established in 1935, LM Radio was Africa's first commercial radio station — a collaboration between a group of amateur radio enthusiasts, Radio Clube de Mozambique, and the entrepreneurial South African GJ McHarry, who had been inspired by the success of independent Europe-based stations. In the 1930s, these were being beamed across to the UK where the BBC had a monopoly over the airwaves — rather like the SABC did in South Africa at the time.
Across the border — and beyond South Africa's censorious jurisdiction — LM Radio was able to play banned music, including songs by those who publicly opposed apartheid
The station was a huge hit, its profits going towards the building of a Radio Palace — featuring some of the most advanced broadcasting kit in the world — in central Lourenço Marques.
"The hit parade as we know it was actually invented at LM Radio," Turner says. Previously, chart toppers were played by a radio station's orchestra. Station manager David Davies (who had been at Radio Normandy before World War 2) decided the original tracks should be played instead. It was the first station in the world to do this.
"In 1969, market research in South Africa said there were 2.4 million South Africans listening to LM Radio. That was bigger than the listenership of the SABC," Turner says.