| NORTH
        HESSARY TOR 
            
              | Channel
                2V | Max
                ERP: 15kW (directional) |  
              | Vision
                carrier: 51.75MHz | Sound
                Carrier: 48.25MHz |  
              | 
 |  
              | The
                approximate field strength contours on this map represent
                average values, and variations as much as 3:1 in field strength
                may occur at individual points, especially in hilly or built-up
                areas. The outer 100µV/m contour should not be interpreted as a
                rigid boundary of the area served, since the quality of
                reception obtainable depended on local conditions. In particular
                fading may at times have been experienced in the outer areas
                served and also, in difficult locations nearer the transmitter. |  
              | BBC
                Engineering information sheet | February
                1957 |  |