The uplink is your transmitting frequency. Earth stations should listen to the downlink frequency and transmit on the uplink frequency only when the ISS or spacecraft is in range and crewmembers are on the air. There is a page of instructions and advice on this web site which will be kept current. To obtain help in using the ISS packet system, just click here for details. This station, and some VHF and UHF repeater groups, provide this service so amateurs and students can hear the educational communications.
Software is available for tracking spacecraft with a personal computer.
This software, designed by David Ransom Jr., has excellent graphics and maps to help create a mock Mission Control Center. Keps provide the software with a spacecraft's orbital track, which the computer uses to calculate its location. Using a tracking program tells an observer when a spacecraft will appear above his or her horizon. NASA Spacelink - One of NASA's electronic resources specifically developed for use by the educational community. Spacelink is a comprehensive electronic library that hosts NASA's educational publications, the NASA Television education schedule, and provides hundreds of subject-related links.