I'm at this too... using this I got the following: At 149750 m v_circ is 2169.97 m/s. If I set periapsis to 149750 m and apoapsis to 150250 m the speed for that orbit at 149750 m is 2170.33 m/s (the difference between the two is 0.36 m/s) As the speed is displayed with only one decimal place and the decoupling will change the speed to some degree (depends how heavy the rest of the ship is at that point...) this might be harder than I initially thought... You have to get to 149750 m with a speed close to but not (much) higher than 2169.97 m/s launch the sattelite and hope that gives it a speed not higher than 2170.33 m/s... Plus... try not to crash into it after decoupling like I did : I also found, the easiest way to carry the satellite is to place it atop the command capsule and land with engine power...
