Radio Transmitters

    ______     ______    __________      _______      ________	     V
   |Micro |___|Audio |__|Modulator |____|RF Amp |___ |Antenna |      |	 
   |Phone |   |Amp   |  |          |    |       |    |Unit    |------|
   |______|   |______|  |__________|    |_______|    |________|
			    |
			 ___|__________
			|RF oscillator |
			|______________|

  |<----Baseband----------->|<------Passband--------------------------->|



Radio Receivers


   V	 _______      ______    ______     _______    _________    ______
   |	|Antenna|___ |RF    |__|MIXER |___|IF Amp |__|Detector |__|Audio |-->Speaker
   |----|Unit   |    |Amp   |  |Unit  |   |       |  |         |  |Amp   |
	|_______|    |______|  |______|   |_______|  |_______ _|  |______|
	                           |			   
                            _______|___
	        	    |Local     |
 			    |Oscillator|
			    |__________|

   |<------RF Stage--------------->|<---IF Stage---->|<---Audio Stage-------------->|