#339

This video presents the basics of the superheterodyne receiver, and the function of each of the blocks. The operation of the frequency conversion in the mixer and the job of the IF filtering stage are described and demonstrated on an actual radio. I use an old Realistic DX-160 shortwave receiver as an example, and show the spectral content of the RF input, the local oscillator (LO) to the mixer, the spectrally inverted output of the mixer, and how tuning the VFO / main tuning knob of the radio adjusts the LO frequency and determines which input signal lands in the IF bandpass filter to be demodulated.

As mentioned, here is a link to the basics of mixers and frequency conversion:
   • #83: Basics of RF Mixers in Radio Rec...  

Video Notes:
http://www.qsl.net/w2aew/youtube/Supe...