| The first radio transmitters and receivers using
nonsinusoidal carriers have been built during the last few years. Most
advanced is the into-the-ground radar by Chapman, which has become commercially
available for construction surveys. Many other good applications for nonsinusoidal
waves are known, primarily in radar but also for special types of communications.
These waves share the spectrum with the existing radio services that have
been traditionally separated by the use of different frequency bands. Two
questions arise from the standpoint of frequency management: 1. Can we
provide additional radio channels by the use of nonsinusoidal carriers?
2. How will such carriers affect existing radio services? The answer to
the first question is that it is indeed possible to add channels to the
existing ones, and not merely replace radio channels based on sinusoidal
carriers. The existing radio services will be affected, in first approximation,
as if the natural background noise had increased. 6 pages. |