| CRYSTAL
        PALACE 
          
            
              | Channel
                1V | ERP:
                200kW |  
              | Vision
                carrier: 45.00 MHz | Sound
                Carrier: 41.50 MHz |  
              | 
 |  
              | The
                field strength contours on this map represent expected average
                values with the E.R.P. indicated; variations of as much as 3:1
                in field strength may occur at individual points. The 0.1mV/m
                contour should not be interpreted as a rigid boundary of the
                area served, since the quality of reception obtainable would
                have depended on local conditions. Fading and interference may
                at times have been experienced in the outer areas served and
                also, in difficult locations, nearer the transmitter. |  
              | BBC
                Engineering information sheet 2906 (1) | July
                1959 |  |