ISS Repeater

Most satellite trackers tell you when the ISS passes over you. This app tells you when you and a second station are within radio range for communicating. The ISS carries a cross-band FM repeater. To make a contact through it, the station has to be above your horizon and above the other operator's at the same moment. ISS Repeater finds those windows for any two stations, up to seven days ahead. TWO STATIONS, OR ONE In DUAL mode, enter both stations and get back only the windows you can actually share. In SINGLE mode it works as a straightforward pass planner for listening to the repeater yourself. Coordinates go in three ways: typed, dropped as a pin on a map, or taken from your phone's own GPS fix. A DOPPLER SCHEDULE, NOT JUST A PASS TIME The downlink drifts about 20 kHz from one end of a pass to the other. Each result card lays out five receive channels across 437.790-437.810 MHz and…