Instruct: Classify a given Amazon review as either positive or negative.
Query: Confusing

I use this book as the standard text of my RF course at Cornell. Honestly, this book is only for casual reading.Though it covers many topics, but all of them lack in details. For instance, it use 10 pages to explain class A and B amplifier. After reading that 10 pages, I still didn't understand why they are named class A and B. While dealing with modulation, no mathematical details is provided (Does the author assume that we already understand that?) After all, I don't feel this book to be a textbook. The way it treats RF is like a computer magazine treats computer architecture. You learn there are CPU and RAM in a computer from the magazine, but you never learn how to build a CPU or RAM. You can't even learn how to build a full bit adder from it.