To optimize the use of the radio spectrum a number of technical procedures may be employed. These have been identified by Hinchman under the heading "design variables," namely: 1. The degree of common frequency usage; 2. The degree to which both satellites illuminate the same area of the earth's surface; 3. Earth station antenna size and design; 4. Antenna polarization; 5. Reversal of frequency assignments; 6. Modulation type and degree; and 7. Interference allowance.^ In his view all of the foregoing variables "in all their combinations and variations must be considered in examining the concept of discrete orbital 'slots' and the danger of spectrum/orbit 'scarcity.'" Thus, the availability of radio frequencies must be established. If such frequencies can operate without interference, the space object can be accommodated in orbit. Gehrig lists ten of the more important technical considerations which allow for an increased use of the geostationary orbit and an enlargement of the number of satellites using the same frequency assignment in an effective way.^ The relevance of these technical considerations was accepted by the 1977 WARC BS. It also identified ten processes which would allow Hinchman, op. cit., pp. 52-55. DIbid., p. 55. Gehrig, op. cit., p. 269.
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