Zeta, con un frecuencimetro puedes ver fácilmente la frecuencia en que transmiten. Me resulta cuando me pasan radiotransmisores y para evitar estar metiendolos en el pc, los pongo cerca de la máquina y aparece en pantalla la frecuencia de trabajo.
Aunque investigando por allí:
Atari's CX-42 wireless joysticks used the same RF frequency range used for garage door openers, walk-talkies, or radio controlled cars / planes (27 MHz or 49 MHz). The controller movements would transmit signals to a receiver that connected to your Atari 2600. The concept did in fact give gamers the freedom to move at ranges of 20 to 30 feet from the receiver. However, the controllers were large and bulky. The receiver had to be plugged into an AC wall outlet, and each joystick required a 9V battery. Other then the complaints about the bulkiness, gamers complained about poor battery life and controller lag (slow on screen responses to gamers controller movements). We would not have been surprised if there were also complaints about garage doors randomly opening (hehe).