> What I haven't figured out is how they get the sats far enough away from the ISS orbit with only one push. What I don't understand here is how do they avoid

> What I haven't figured out is how they get the sats far enough away from the ISS orbit with only one push. What I don't understand here is how do they avoid the satellite hitting back the ISS? Once they are separated and non-propulsed, both orbits are elliptical with at least one point of intersection, and stay like that forever. If they have different period, it seems that the ISS and the cubesat might become arbitrarily closer in the future.