radio frequency spectrum & antennas

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Discussion in 'General Electronics Chat' started by micro1, Apr 29, 2016.

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Apr 29, 2016 #1

micro1 Thread Starter Member

Feb 22, 2015

76

1

hi all

I have a question in my mind:

how it was radio frequency spectrum Past and Present( is mean now )?

how it was antennas Past and Present(is mean now )?

Last edited: Apr 30, 2016

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Apr 30, 2016 #2

bertus Administrator

Apr 5, 2008

18,228

3,481

Hello,

Have a look at some very old books that you can download here:
http://www.tubebooks.org/technical_books_online.htm

Then compare them with new books you might find in the library.

Bertus

#2 Like Reply
Apr 30, 2016 #3

micro1 Thread Starter Member

Feb 22, 2015

76

1

please Join me your ideas about radio frequency spectrum and antennas at old and now

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