basically you have a 40Mhz oscillator and by mutual coupling you get the third harmonic (120Mhz) that you put on a NE602 as mixer against 144Mhz input with a preamp and on the output you get 24Mhz (144-120).
Schematic and prototype photos:
Sunday, June 21, 2009
144Mhz to 24Mhz downconverter
Some past project I built but never put to work... maybe some day I will check again on this one, I remember the oscillator worked. I am sure it will work the rest of the circuit.
basically you have a 40Mhz oscillator and by mutual coupling you get the third harmonic (120Mhz) that you put on a NE602 as mixer against 144Mhz input with a preamp and on the output you get 24Mhz (144-120).
Schematic and prototype photos:
basically you have a 40Mhz oscillator and by mutual coupling you get the third harmonic (120Mhz) that you put on a NE602 as mixer against 144Mhz input with a preamp and on the output you get 24Mhz (144-120).
Schematic and prototype photos:
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