MEDIUM-FREQUENCY BROADCASTING

The United States wanted additional medium-wave frequency allocations that would make room for hundreds of new AM radio stations. The Federal Communications Commission supported this proposal as a means of increasing minority ownership of broadcasting properties.The plan called for adding the 1605-kilohertz to 1860-kilohertz portion of the radio band to be added to the AM spectrum.

This was a half-vicotry. AM broadcasting was expanded immediately into the 1605-kHz to 1625-kHz band. AM also will be allowed to expand into the 1625-kHz to 1705-kHz band on a yet unspecified sharing basis with fixed and mobile communications services as well as radar. A regional conference was set for 1985, at which a definitive plan for specific allocations will be decided for the 1625-kHz to 1665-kHz band will be mapped out. AMATEUR SERVICES

The United States sought to maintain present amateur shortwave frequencies, and add new allocations for such things as the amateur satellite service.

The United States got more than it asked for. The only drawback is that in some instances amateur services will have to share frquenices with other fixed and mobile services. HIGH-FREQUENCY BROADCASTING

The United States wanted widespread expansion of shortwave broadcasting in the high-frequency band, particularly in the 6-megahertz and 7-megahertz bands, but secondarily in the higher bands where interference is more of a factor.

The U.S. proposal "failed because of opposition from a majority of countries having continued need of these bands for fixed services (such as national telephone services in developing nations, which rely on the chapter satellite technology to reach outlying areas)," according to the U.S. delegation's official summary. All that was granted was certain additional frequencies in less desirable bands. But the WARC did a approve a special HF broadcasting conference for the mid-1980s "to plan for the more efficient and equitable use of the broadcasting bands." ULTRA-HIGH-FREQUENCY BROADCASTING

The United States proposed to share the existing ultrahigh frequency television band with fixed and mobile broadcasting services, like police band two-way radio systems. With UHF television not growing as fast as was originally thought, the United States felt this was a ripe area to handle some of the boom in demand for land mobile services.

Resistance from Canada, Mexico and Cuba prevented the United States from getting its way completely on this proposal. They want the band for UHF television, and are concerned that land mobile emissions from the United States would interfere with their broadcats up to about 125 miles from the U.S. border. Instead, the United States filed a "reservation" at the conference which said it will work things out with those countries, and begin to use the UHF band for the new services, but avoid any interference. RADIONAVIGATION SATELLITE SERVICE

A key objective of the U.S. WARC delegation was to secure allocations for the newest U.S. satellite navigation system, the Navstar Global Positioning System. The system ultimately will use 24 orbiting satellites, and will be able to plot their positions at any given moment within a few feet -- anywhere in the world. Although this is primarily a military system, it can be adapted a civilian use, where it is far more accurate than any other radionavigation system in existence.

The United States won this allocation, partially because it offered use of this system to the entire world. The system will be open to all, but still will be used by our military in a secure way because of certain sophisticated technology. MARITIME MOBILE

The United States was seeking considerable increases in allocations for aeronautical radionavigation to alleviate crowding on the maring bands.

Although several new frequencies were allocated to marine mobile, they were added in virtually useless bands. The United States, disappointed with the results, entered a "reservation" in this area, expressing a need to expand the service into new bands allocated for other services. RADIOLOCATION (RADAR)

Despite major objections from the United States, the 1979 WARC dramatically downgraded the worldwide status of radar systems, in several cases relegating such services to secondary status behind other services sharing the same frequency such as fixed broadcasting.

Here, again, the United States reserved the right to operate in traditonal radar bands without guaranteeing protection to the other, upgraded services. The United States did say, however, that it would do everything possible to avoid such interference. FIXED AND BROADCASTING SATELLITES

The United States business community carried the ball here with highly technical proposals that would allow widespread sharing of the geostationary orbit on the 1i gigahertz band. The geostationary orbit, some 22,000 miles above earth, is the one slot where satellites can orbit in synch with earth, and actually appear to be stationary above the same spot.

The United States scored a major victory here, defeating attempts by Canada and developing countries to institute formalized planning in this band -- which could have scrapped plans of several major U.S. firms to launch satellites offering new business services. SOLAR POWER SATELLITE

The United States proposed the allocation of a frequency for an experimental solar power satellite that would collect the rays of the sun on a 20-square-mile collector in outer space, convert them to energy and beam them back to earth as raw power.

Fearful of possible environmental hazards posed by this satellite, a majority of nations nixed any plans to assign it a frequency just yet. The conference did call for further study, however, and ruled that the United States could have its frequency if the system is found to be safe.