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James A. Van Allen lab journal, March 1958-September 1959
Page 5
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recording cycle. Due to weak spring in ratchet mechanism Probably not serious the since spin rate rapidly diminishes (in Explorer I) and Iw converted to flat spin about a transverse axis. The characteristic modulation of field strength 7 sec period. (Well observed by Swenson at Illinois & Irving Gerke at Collins Radio for example) (4) Recorder will checked over and re-adjusted mechanically and the spin modulation will be studied and eliminated if possible. (5) 2 1/4 hr. available recording time on final model. 55" of total tape. - some unused portions at the ends.
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recording cycle. Due to weak spring in ratchet mechanism Probably not serious the since spin rate rapidly diminishes (in Explorer I) and Iw converted to flat spin about a transverse axis. The characteristic modulation of field strength 7 sec period. (Well observed by Swenson at Illinois & Irving Gerke at Collins Radio for example) (4) Recorder will checked over and re-adjusted mechanically and the spin modulation will be studied and eliminated if possible. (5) 2 1/4 hr. available recording time on final model. 55" of total tape. - some unused portions at the ends.
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