Power required for the 30kW spark gap transmitter was provided by a 75hp English Gardner petrol-kerosene engine driving a 30kW alternator via a belt.
It is interesting that a British engine was used in a radio station built by the German company Telefunken as a “turn-key” operation. This may well have been a “political” decision.
Bill Walker, in a 1962 radio interview, speaks of going off to war in 1916 and having to teach a local boy how to run the engine until a man (B Winstanley) arrived from Auckland.
He also mentions that, due to the poor transport in the area, fuel for the engine was obtained in small cans – which must have been a real inconvenience.
Example of a Gardner petrol-kerosene engine from the 1920s: