NASA Logo, National Aeronautics and Space Administration
NASA Space Science Data Coordinated Archive Header

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 command, with 670 mw of power and at a frequency of 20.005 mHz. A 0.01-mHz 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 The antenna was retracted during operation of the drag experiment in order to provide a better drag cross section.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
[] NASA Logo -