More on Linear Transponder Calculations
In my last post on the subject, I'd concluded The result is that for non-inverting transponders, the equation is this: `up_o = (dl_o - bc_d + bc_u)/(1-v_r/c)` For inverting transponders: `up_o = (bc_d + bc_u - dl_o) / (1 - v_r/c)` Soon after, I received a kind email from Tony AA2TX, with an offprint of his 1997 Space Symposium paper that describes the object-oriented computational approach that is built into the InstantTune code.[1] Since I've been happily pillaging the IT code for some time now, I'd noticed what this article confirms, namely that instead of using `(up_x) / (1- v_r/c)` to get the value of the origin signal from the received signal, InstantTune uses `(up_x) (1+ v_r/c)`.