Why Saltburn's trials are described as Type 79

Was Saltburn specifically a test bed for the Type 79X radar?

Type 79X is too narrow a description of the whole programme because Saltburn tested several evolving forms of Type 79.

Saltburn tested several evolving forms of Type 79 radar. The equipment fitted initially and the configuration operating six months later differed substantially. Type 79 is therefore the preferred broader name for the ship's trials. Assigning every trial to Type 79X would collapse that development sequence into one version.