Sunday, March 21, 2010

Oscillator Output on DX-200

I finally got off my butt and went over the circuit diagrams for the DX-200 SW reciever I have, I wanted to add a BNC ouput for an external frequency counter. I took the cover off and probed around Q104 Q105 the local oscillator and buffer amp, I found a frequency of 986 khz which after subtracting 455 khz gives me 531 khz a local AM station it was tuned to. The 455 subtraction is due to the addition of 455 khz to get the IF.

The counter I have is a 500 mhz unit and will cover all my needs including UHF, I am going to make an haceduino controlled counter that automatically subtracts the offset

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