Message #204412

[Jennifer Murdoch]

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       All these calculations assumed that the transmitting civilization is
       at the same level of technological evolution as ours on Earth.

       Von Hoerner (1961) classified the possible nature of the ETC signals
       into three general  possibilities:  Local communication on the other
       planet, interstellar communication  with  certain distinct partners,
       and a desire  to attract the attention of unknown  future  partners.
       Thus he named  them  as  local  broadcast,  long-distance calls, and
       contacting signals (beacons).  In  most of the past fifty SETI radio
       projects, the strategy  was  with  the  hypothesis  that  there  are
       several civilizations transmitting omnidirectional beacon signals.

       Unfortunately, no one has been able to show any positive evidence
       of this kind of beacon signal.

       Another possibility is   the   radio   detection   of   interstellar
       communications between an ETC planet  and  possible  space vehicles.
       Vallee and Simard-Normandin (1985) carried out a search for these

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