communication cct

i have a really problem in dealing with communication cct.s like fm and am transmitter or reciever ,,, i studied a full courses in communication system and electronic in the years of university but now, after garduation i couldnt understand these cct.s when i search in the web. so if anyone could help me plz

Post a specific question, or a schematic and they ask a question about it. Your request is not specific enough. I could just tell you to reread your text books...