The 900 MHz band has been used for industrial mcirowave heating for many years, for such diverse applications as thawing or tempering of large blocks frozen food, continuous baking and continuous vulcanisation of rubber. The UK TACS (Total Access Communication System) cellular radio network is also assigned to this band and the two operations have happily co-existed without serious problems. Recently, however, the large growth of microwave heating applications and the proliferation of cellular radio has led to concern over the continuance of this harmonious co-existence. This has led to a unique partnership between the cellular operators and the microwave heating equipment manufacturers in order to ensure that both services can continue without detriment to either of their respective user communities.