I'm not trying to be condescending, I genuinely have the best of intentions here, but I think this project is well over your head. RF isn't beginner material -- even folks that understand it think it's half science and half black magic. If you want to learn something new, you should probably weigh your expectations against your experience level and pick a project that is beyond your current understanding, but only a by a little -- a gap you can realistically close. OTOH, if RF is really something you're passionate about, you probably need to pick up a book on theory, and read that (and related material) until you feel like you have a solid grasp on the concept.I see a lot of people come through here asking for advice on topics that are obviously leagues beyond their capabilities. It's a bitter pill to swallow sometimes, but providing answers to those questions is about as helpful as speaking in a foreign tongue. If the poor chap were close enough to understanding that a forum post would clear things up, they probably would've figured it out on their own.Just my two cents...
I think the OP may be a bit confused re what is needed.A few posts back, the OP indicated they wanted to make a walkie talkie.Firstly, such radios dont operate in the FM band, but usually in the 433 - 434 UHF band , similar to UHF CB radios.Such radios use narrow band FM , bandwidth limited to a 10 Khz channel, with typically 5 Khz deviation.In this case its essential that the frequency stability of the both the transmitter and receiver is controlled by a crystal oscillatorwhich usually provides the clock for a fractional N dual modulus pre scaling synthesiser.In my work life I used to design and make such things, and its not that hard to do , but sure isnt a beginners project.
Its a bit old , and there are far better ICs around now , but the explanation is easy to understand.http://epic.mcmaster.ca/~elmer101/wx_synth/wx_pll.htm
then i realized that frequencies of a radio have a specific range of frequencies so around it there plenty to work with
SirNickity well yes your totally right, but i did read some theories and i have an idea about but i am sure i have missed a big step but i am not sure which one because when it comes to practical things, it's a mess and i feel totally confused any suggestion of what i must really look for ?
Quotethen i realized that frequencies of a radio have a specific range of frequencies so around it there plenty to work withI think you need a lot more background in radio before tackling a transmitter.How about getting a short wave set ( or making one ) and get a feel for radio in the raw.
Haha.. welllll, no, because I have no clue what I'm doing with RF either.
Get yourself a copy of this book.http://www.arrl.org/arrl-handbook-2014It explains the basic theory of Radio Comm pretty well, and has constructional articles of how to build both transmitterss and receivers.
i checked about the walkie talkie seems it doesn't really need any license
and what did u mean by getting a short wave set ( or making one ) and get a feel for radio in the raw ?