I think the Jammer deserves a green icon, since it actually does it job pretty well.
Then there is a Jitter parameter. It allows to introduce a jitter from 1/60th of a second up to 60/60th of a second (a full one). It will delay / move forward either the TX or the cooldown period for a maximum of a half of the time you choose as jitter.
Meaning: If I choose 60/60th, a full second of jitter, it will produce a random number from 1 to 60.
Then it will calculate jitter = 30 - randomnumber
THen it will "add" that (positive or negative) time to the time counter for the next jitter change of state.