CORA: A direct sequence spread spectrum radio for voice and data

For many years the ordinary FM radio (e.g., the VRC 12 family) was the workhorse in military forces throughout the world. This type of radio has some advantages; it is relatively simple and cheap, it has a low power consumption as a man-pack, and an excellent voice quality. Since the modulation type and details are known by everyone, however, the messages are easily intercepted and even rebroadcasted in order to fool the enemy. Age is also becoming an important argument for introducing a new radio generation on the market. Radios operating in the military VHF band 30 to 88 MHz are discussed. The requirements for such a radio will of course vary from country to country. The most important requirements are given.