that reasonably could be expected over a development-deployment time period extending into the next century. At the low end, the technology is pushed; at the high end the costs become marginally competitive with other sources, as will be seen subsequently. For the solar photovoltaic system Grumman Aerospace Corp, derived a 1.46 kg/kW specific weight for a 14 percent cell efficiency during this study. The transportation-assembly costs range from a low cost Heavy Lift Launch Vehicle (HLLV) figure of 100 $/kg to a Shuttle based figure of 600 $/kg described in Section 8. Preliminary studies examined costs extending up to j000 $/kg, but these were discarded as the Shuttle costs were derived and served as an upper bound. Relations for DC-RF converter medium weight and cost parameters as functions of frequency were: 12.2.3 CONVERTER PACKING The converter thermal radiator diameter limits the tube packing and radiated power density at the center of the transmitting antenna, and therefore sets a minimum antenna diameter for a given value of total radiated power and beam taper. The thermal radiator diameter depends upon converter efficiency which is a function of frequency.
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