Photographic documentation of Mission Specialist Vladimir Titov conducting a Very High Frequency (VHF) voice link verification test on the Space Shuttle Discovery's aft flight deck during STS-63. The VHF voice link verification was designed to demonstrate the compatibility of the Shuttle VHF voice communications system with the Mir VHF system during the Shuttle-Mir rendezvous in preparation for the Shuttle-Mir docking missions.
