In a message dated 11/27/00 7:23:13 PM Mountain Standard Time, [EMAIL PROTECTED] writes: << Gentlemen, I have a RCD 535 Rx that works fine with my Stylus on 53 but won't work with my Focus 4 on the same channel but the Focus dose work with the RCD 3500 that it came with. I would like to use the 535 in a M.A.D. P-40 with the Focus. The 535 was in a Roughneck Aurora controlled with the Stylus. Please advise and thanx for your time. Mark J. >> Mark, It sounds like that 535 is a positive shift model. The Hitec transmitter is a negative shift and the Stylus can be either positive or negative depending on what you program. If so then you'll need to get a negative shift receiver if you want to use your Hitec tranny. Good luck, Lenny RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]