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Electron Content-Beacon

NSSDCA ID: 1964-084A-02

Mission Name: San Marco 1
Principal Investigator:Prof. V. Carrara


The ionospheric beacon experiment consisted of a high-frequency radio transmitter that operated on ground command, with 670 mw of power and at a frequency of 20.005 MHz. A 0.01-MHz or 100 Hz keyed frequency shift was provided for positive signal recognition. The transmitting antenna was a retractable 5-m (tip to tip) dipole that was oriented along the spacecraft spin axis. The antenna was deployed when the experiment was operating and retracted during operation of the drag experiment in order to provide a better drag cross section. The experiment was operated from about December 31, 1964, to January 13, 1965, and obtained 2068 min of beacon transmissions.

Alternate Names

  • SanMarco1/ElectronContent-Beacon

Funding Agency

  • National Research Council-Italian Space Commission (Italy)


  • Space Physics: Ionospheric Studies

Additional Information

Questions and comments about this experiment can be directed to: Coordinated Request and User Support Office



NameRoleOriginal AffiliationE-mail
Prof. V. CarraraPrincipal InvestigatorUniversita degli Studi di Firenze
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