Futaba PCM Receivers 138DP VS 148DP
My flying buddy and I had the same questions about a month ago when he was looking for another RX for his 8 channel. The folks at Tower told him the 148DP is refered to as a micro RX, and uses the latest electronics technology, while the 138DP is the traditional RX. I don't know if I totally believe that, but that is what he said they told him. He ordered the 138DP and it seems to be doing just fine.
Vince