Fig. 3. Inside configuration of the METT subsatellite. The diagnostic unit (DU) is moved along the wire which is roped between the sub-satellite and the top of the balloon. Two pairs of the antennas for VLF and HF receiver and a boom with Faraday cup and Langmuir are extended from the DU in the balloon. The attitude control with gas jets is necessary for the sub-satellite to make it point to the bus platform, because the angle between the microwave beam and the plane of the dipole antenna array must be kept perpendicular. A TV camera is used to collect information of the relative location of the bus platform. Fig. 2. Configuration of the METT sub-satellite.
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