I have read that the older Jettronics Door Sequencer and Brake Valves have a problem recieving the signal (from the receiver) on 2.4 systems. I guess a Matchbox or PowerBox can be utilized to rectify the problem .... but I heard that Jettronics (or some other company) was going to come out with a fix .... some sort of an in-line amp/booster. Wondering if it is available yet ? Thanks. Bob