Quote:
Originally Posted by Bazz4CQJ
That's an interesting perspective on things and will be added to my file on adding DFC's to receivers! My on-going "multi-year" rebuild of my HRO eventually plans include the addition of a DFC, and as you say, the fet buffer is fairly ubiquitous, but may well be a sub-optimum solution!
B
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Given that the HRO's local-osc is quite powerful (when operating on 14MHz it leaked enough third harmonic to cause TVI !) I wouldn't worry too much about the need for much coupling between the LO circuitry and any buffer-stage.
Modern DFCs are surprisingly sensitive - the one I used to have would readily detect the LO of my little AR1000 scanner if I just rested the scanner against the DFC's input-connector.