Greetings,   Two recent papers concerning the historical and current behavior and operating aspects of AO-7 were written and published in the AMSAT Journal by the undersigned.  I would recommend those who are interested contact the AMSAT office, Martha, and get copies of the two articles to read.    "AO-7's Frequency Variability as a Proxy for Spacecraft Temperature', (2007), The AMSAT Journal, May/June 2007, pp. 23 - 26. "AO-7 - 35 Years in Space: Solar Array Power", The AMSAT Journal, January/February 2010, pp. 4 - 15.   There is a wealth of information in these two articles and are good jumping off points for further study of AO-7.   73, Jim DeYoung, N8OQ (formerly KG4QWC)