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Showing posts with the label qrptracker asciimath transponders

Calculating Linear Transponder Uplinks

As previous posts show, my sattrack code is working fine with uplinks and downlinks that do not have any interdependence, such as beacons and FM satellites. For linear transponders, I used a simplistic approach that was not giving good results, so I hit the books over the weekend to derive formulas that will determine the source uplink frequency (at the radio) for a given downlink frequency. In the following, I'm using the definitions of Davidoff, chapter 8.