SatPC32 v12.7 for North American Users
            一款用来计算围绕地球运行卫星轨道计算的软件。SatPC显示了一个或者多个卫星在世界图上的可见区域，并且在地图下方的文本区中显示了结果。Wisat实时显示了卫星位置。
            本软件是针对北美用户的版本。

            Screenshot of FO-29. The distance between 2 points of the ground
            track corresponds to a 2-minute time interval. FO-29 allows SSB and
            CW contacts on 2m uplink/ 70cm downlink. When you select the
            satellite SatPC32 will automatically set the proper uplink and
            dowlink frequencies and modes. While the satellite is in range you
            will immediately hear your signal with the right audio pitch. You
            don't need to tune arround to find your signal as you would have to
            do without automatic frequency control. During the pass you can tune
            around the passband with the VFO like in terrestrial operation and
            no corrections due to the Doppler shift changes will be necessary.

            The screenshot above shows a "BlueMarble" topographical map (owner:
            NASA's Earth Observatory) as graphical background. A ZIP file,
            containing 6 selfextracting ZIP files with all maps that can be used
            with SatPC32 and instructions how to change the maps can be
            downloaded on the page "Downloads".
            The programs SatPC32.Exe (in the following: SatPC) and Wisat32.Exe
            (in the following: Wisat) calculate the tracks of earth orbiting
            satellites. The calculations are based on the SGP4/SDP4 model, the
            results therefore are highly accurate.

            Both programs are included in the SatPC32 program package.

            SatPC displays the audibility-areas of one or several selected
            satellites within a world-map and shows the results in text-lines
            below the map. Wisat represents the satellite positions in real-time
            in list-form. Both programs update their calculations continuously
            in steps of one second. The differences between SatPC and Wisat
            result from the absence of the graphic output in Wisat.

            SatPC and Wisat steer the antennas and radio frequencies (CAT) for
            Doppler correction. Both programs allow multitasking with programs
            that provide data transfer with satellites like Wisp32. SatPC32 and
            Wisat32 then will take over the antenna- and frequency-control. The
            automatic switching on a satellite works synchronized with the
            data-program.

            The automatic Doppler correction also works with ssb transponders
            like FO-20, FO-29, AO-10, AO-40.

            The antenna-control steers the AMSAT Rotor Interface and the
            ready-appliance IF-100.