The book is organized into comprehensive chapters that detail various aspects of radio systems: RADIO ENGINEEßING
Mithal uses excellent circuit diagrams; try redrawing them from memory.
is a foundational resource for communication engineering students, known for its focus on competitive exam preparation. GK Publications Key Features and Content Comprehensive Core Coverage
As for the PDF version, I couldn't find a direct link to download the book. However, I can suggest some possible sources where you might find the PDF: