CEEFAX: UHF field trials

Field trials were carried out using experimental CEEFAX data transmissions at the two information rates of 4(5) and 6(875)MBits/s. The purpose of the trials was to investigate the coverage or service area of CEEFAX in comparison to that of the associated color television signal, and to see if there were any special problems with the transmission and reception of CEEFAX which did not arise with color television. The results indicated that CEEFAX was a rugged transmission system and that in general the size of the service area for CEEFAX transmission was greater than that for color television. There was little difference in the sizes of the service area for either the low or high data bit-rates.