If the observatory follows the SETI protocol, staff at the observatory will make as many checks as possible using their own system. For example, they should
1. check that the signal disappears when the telescope is moved a small number of beamwidths o® source, and re-appears when the telescope goes back on source.
2. They should check that the signal moves as expected in frequency when the local oscillator is changed, and that making other changes to the receiver system (e.g., changing polarisation) makes the signal behave like a genuine extraterrestrial signal rather than interference.
3. They should also check the security logs of the observatory computers to check whether their firewall has been breached by a hacker or hoaxer.
4. If the signal passes these tests, then another radio observatory should be contacted and asked to check on the signal.