Demonstration of digital radio broadcasting at 90MHz-108MHz with a V-Low multimedia transmitter: Realization of a compact and high performance power amplifier

Hitachi Kokusai Electric exhibited a V-Low multimedia transmitter. This is a new digital broadcasting system that utilizes the vacant space of analog television broadcasting. In the demonstration there was an exhibition in which new AM-FM radio digital broadcasting, road information and disaster prevention information was given in the 90MHz-108MHz bandwidth that corresponds to VHF channels 1-3. Three 400W power amplifiers (PA) were used to increase power up to 1.2KM for the broadcasts. In the days of digital terrestrial broadcasting, it was not possible to build-in a large 300W fan in the same size, but with this PA, miniaturization has been realized, so the fan can be built-into the device to achieve 400W with one PA.