The major activities for this reporting period have been the completion of the Ascension Island launches, a launch site survey trip in Africa, the development of calibration formulae for TWERLE, and a continuing design effort on the TWERLE electronics system (including transmitter performance tes... Show moreThe major activities for this reporting period have been the completion of the Ascension Island launches, a launch site survey trip in Africa, the development of calibration formulae for TWERLE, and a continuing design effort on the TWERLE electronics system (including transmitter performance tests and balloon platform simulator), both at NCAR and the University of Wisconsin. Show less