 There was no camera or midcourse correction engine on the Block I spacecraft.The communications system included the high-gain antenna and an omnidirectional medium-gain antenna and two transmitters, one at 960.1 MHz with 0.25 watts power output and the other at 960.05 MHz with 3 watts power output.Power was to be furnished by 8680 solar cells on the two panels, a silver-zinc battery, and smaller batteries on some of the experiments.