We have already discussed the theory of operation of our basic PPM  radio. Now lets address some of the terms which are associated with the transmission of the signal to the receiver.

AM, FM, PPM, PCM, Single conversion, Dual conversion, Wide band, Narrow band, Computer radios. Are these terms confusing to you? If so lets try to clear some of it up.

Let us start by defining the basic, Radio Frequency.

Radio Spectrum: That part of the general fre

quency spectrum between  10KHz to 30,000 mHz. Generally an alternating current frequency whose electromagnetic field can be radiated over great distances. (Or a frequency which transmits)

When you purchase a radio you specify a channel for it to operate on. The channel defines the frequency that the Carrier Signal is transmitted on. The carrier signal is the radio frequency to which your encoded data is superimposed on to carry it to the receiver.

Within the United States, the use of the radio frequency spectrum is controlled by the Federal Communications Commission (FCC). Regulations con