Single Conversion LF Upconverter - G4JNT

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ejection of –40dBc, which at LF will probably result in out of band signals, is considered to bean acceptable level of spurious products by many authorities.It is up to you to decide if this rejection figure is acceptable or not!References[1a] - http://www.g4jnt.com/IQConverters.htm Fig 3[1b] - “ “ “ “ “ FIg 1[2] - http://www.softrockradio.org/node/1[3] - G3PLX SDR transmitter softwarehttp://www.g4jnt.com/SDRTxSW.htm[4] - http://www.g4jnt.com/OPA_AllPass.xlsAlter the values of C1 R1 C2 R2 to see how the rejection vs. frequency responsealters.G4JNT Direct LF Upconverter Page 4
Figure 1 - Complete Upconverter circuit diagramG4JNT Direct LF Upconverter Page 5
Page 1 and 2: Single Conversion LF Upconverter An
Page 6 and 7: Figure 2 - AF Drive Broadband noise
Page 8 and 9: AppendixNew Improved version with D
Page 10 and 11: LF Upconverter PCB mounted above th
Page 12: G4JNT Direct LF Upconverter Page 12

Single Conversion LF Upconverter - G4JNT

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