I'm a portuguese engineer and i'm giving my first's steps in the field of SSR for maintenance purposes. For all of those who are in a similar situation i recomend these book because it will give you the whole picture of these systems as a first step to your particular equipment/system. Another very good book is: Understanding radar, by Henry W. Cole, Colins Professional and Technical Books, ISBN 0-00-383058-6, but a litle older (1985).
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