I can understand when you already have a few Transmitters but, think about being able to change chanels when the scanner tells you that a chanel has interference. The Tracker is a fully synthesized transmitter that works with any F.M. receiver + or - shift. I have a Tracker II and have experienced channel freq. interference many times at our field. The tracker has aloud me to find a clean channel that I can change to. If your plane has the Polk (SEEKER) receiver you can change channels with ease. I think you are going to see all of the R/C radio manufactures switching to synthesized systems. Go to www.polkshobby.com and check out the Tracker. Skinny Bob.