Abstract
CAPTAIN P. P. ECKERSLEY addressed the British Institute of Radio Engineers at its meeting on April 18 on “The Future of Radio Communication”. He dealt at some length with the limitation of communication channels available, for the whole of Europe for example, without mutual interference, and explained that, although the number of possible frequencies available might be infinite, the useful range is not. He said that the service range of transmission might be said to be proportional to its wavelength, so that very high frequency transmissions have a very small reliable service area. If the band width occupied by a transmission could be reduced, the number of channels could be increased in the same proportion. Examples of narrow band transmissions cited included single sideband, suppressed carrier (for wired transmissions) and restricted modulation frequencies, and he mentioned an American invention by which an intelligible modulation range of 200-3,000 c./s. can be transformed at the transmitter to a range of from zero to a few hundred cycles a second, thus reducing the sideband frequency width to be accommodated, and providing further channels in a given range of carrier frequencies ; the signal is retransformed at the receiver. Captain Eckersley still believes, in spite of theories to the contrary, that sidebands were real.
Article PDF
Rights and permissions
About this article
Cite this article
Future of Radio Communication. Nature 149, 465–466 (1942). https://doi.org/10.1038/149465b0
Issue Date:
DOI: https://doi.org/10.1038/149465b0