I think you are right. Hopefully they have more info about the transmitters than can be found on the net.
"...The IRGC Air Force prepared a confidential report on the features of the new missile and sent it to the IRGC command. It read: "Zelzal 2 missile has been produced for deploying in other countries and in Iraq in particular. When we want to hit a building in Iraq, we simply have to send an agent with the transmitter unit (which is not bigger than a mobile telephone) near the building to put it in a trash bin, beside the wall or on the roof. After an hour, an improved version of Zelzal 2 missile is launched towards the building and by receiving the signals from the transmitter the missile would be guided towards the target..."