ARRL's HF digital handbook

Passing your license test is less than half the challenge of ham radio. You have to learn what to do, how to do it, and etiquette on the air.

I have used digital modes at our club field day. This looked like a good way to get in with both feet.

I was wanting to get a start into digital modes of ham radio after being out of it for a number of years. This book helped me get started again.