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???
04/20/07 06:01
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 		 #137596 - Superhet
Responding to: ???'s previous message
Richard Erlacher said:
Not all transmitter/receiver schemes use an IF but it is pretty popular.

It's called Superheterodyne - or superhet for short.

http://en.wikipedia.org/wiki/Superhet

Just about all broadcast radio receivers and TVs use it.
The main advantage here is that the IF is fixed



List of 41 messages in thread
TopicAuthorDate
rf transmitter /receiver            01/01/70 00:00      
   more details needed            01/01/70 00:00      
      rf module            01/01/70 00:00      
         Datasheet!!            01/01/70 00:00      
         to Sunish Nair ...            01/01/70 00:00      
            rf module            01/01/70 00:00      
               the published sheet is hardly a datasheet!            01/01/70 00:00      
                  No such thing as a free lunch...            01/01/70 00:00      
                     this is paticulary true of Taiwanese products            01/01/70 00:00      
                        Experts only?            01/01/70 00:00      
                           I seriously doubt that ...            01/01/70 00:00      
                     a common problem            01/01/70 00:00      
                  details            01/01/70 00:00      
                     cheap is sometimes expensive            01/01/70 00:00      
                        But how can you tell?            01/01/70 00:00      
                           you can't            01/01/70 00:00      
                        rf            01/01/70 00:00      
                           do not go in blindly            01/01/70 00:00      
                           Development vs production cost            01/01/70 00:00      
                     RS India?            01/01/70 00:00      
               I use these modules            01/01/70 00:00      
                  now I'm confoosed what is 'if'            01/01/70 00:00      
                     IF = intermediate frequency            01/01/70 00:00      
                        Superhet            01/01/70 00:00      
                     Please show me what confuses you            01/01/70 00:00      
                        just how is IR relevant to this thread?            01/01/70 00:00      
                           He said            01/01/70 00:00      
                        bad eyes, need new glasses            01/01/70 00:00      
                           How about these?            01/01/70 00:00      
                  CRC: picky, picky            01/01/70 00:00      
                     I know            01/01/70 00:00      
   Study the Requirements of the RF Pair            01/01/70 00:00      
      Consider the ethernet packet structure            01/01/70 00:00      
   Rx unable to drive 89c2051            01/01/70 00:00      
      ...and the rest            01/01/70 00:00      
         if you 'own' both ends            01/01/70 00:00      
   Check Serial Data format            01/01/70 00:00      
      somthing to rf            01/01/70 00:00      
   sorry - ignore this post            01/01/70 00:00      
   ASK is frequency distrub by noise.            01/01/70 00:00      
      Shouldn\'t the ones he already has work?            01/01/70 00:00      

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