Superheterodyning

1210

16:01:21

Superheterodyne receiver technology is practically used in every radio today.Basically heterodyning means stepping down (or up) the frequency of the received signal for easy of processing. One extra stage makes the receiver more stable more selective and increases overall quality. It revolves around a few steps:
The received RF signal is amplified (optional)
The RF signal is mixed with a lower frequency from a local oscillator.  This produces 2 separate frequencies mixed in one. The sum and the substact of the rf signal and the local oscillator (f2-f1) and (f2+f1). 
One of the product frequencies (usually the higher one) is filtered out and only the lower one remains. 
Once we successfully stepped down the original frequency we can now feed it to the detector and restore it. 

published 11 years ago

lelox93

11 years ago

Awesome

hurz

11 years ago

Sorry, this is only 50% correct.

thebugger

11 years ago

i know I'll try and rebuild it with a balanced diode mixer but i don't think I'll have the space to do it. That's why i chose this way.

Bootsy7718

11 years ago

Do you have a multisim that you could use and share it there?

usernames

11 years ago

Good job Bugger! Getting that to display on scope correctly is a feat in itself!

zorgrian

8 years ago

This is an accurate description of a direct conversion receiver

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