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Find a good library that has back issues of the Bell System Technical Journal ( BSTJ ). It's all in there.
If the store is too far away or too annoying, people shop online. I bought shoes online since I don't even know where a good shoe store is.
McDonalds. Landscaping. Painting.
Radar is a fascinating subject to me as it covers practically every aspect of general engineering as well as radio communications and elecronics
I would say radio communications engineering plus electronics would be the primary subjects to start with. Digital computing methods such as Digital Signal Processing should be covered in the comms syllabus
You will need a knowledge of Microwave and millimetric techniques beyond the normal communications syllabus
You may also need a good knowledge of mechanical engineering, hydraulics engineering and low temperature physics as well if your interested in "heavy" high power ground based Radars, though aviation radar may well need these subjects as well.
A good Radar scientist/ engineer really needs to have a good working knowledge of almost every branch of engineering there is!
This is why (to me) it such an interesting field
The change for FM radio falls under the name HD Radio. Cellphones have been digital for quite sometime and have gone through several different standards. The latest deployed standards for cell phones are called CDMA2000 and UMTS. Aircraft communications would have been changed under a program called NEXCOM.
A good book on Digital Modulation is Digital Communications: Fundamentals and Applications (2nd Edition) by Sklar.
Much of the conversion from analog to digital is made possible by source coding. These methods greatly reduce the amount of data required to transmit data by techniques that might alter the actual data but appear the same. Examples in everyday life include MP3, JPEG, and MPEG.
The simplest answer is 'noise'. Since digital information moves in predetermined patterns, like ones and zeros, it is much easier to determine if a bit of 'signal' is part of the information.
Analogue can have any value signals, and so it is much more difficult to determine if there is noise (read errors) in the information.
Further, since digitalized data is quantized, it can even be counted, with totals arriving with the other information. So, as a simplified example, I can send you the word "Three" and also include that the letter count is 5, and the value count is 48 (if you use the numeric value of each letter from 1 – 26.) Now if there is a mistake in transmission, I have a way to know, and perhaps even correct the error. analogue carries no such possibilities.
Once your analog phone voice signal reaches your local telephone exchange switching center, it is probably converted to digital for processing and forwarding to the destination exchange you are calling. There it is converted back to analog for delivery to the analog phone line you are calling.
But, for sure one day all telecom signals will be digital. (except for the RF transmittion methods)