Analog VHF IQ Receiver with Low IF

A complete all-analog VHF Receiver is described with IQ image suppression and 455kHz IF. Two examples are discussed, at 50MHz and 144MHz. Image suppression is greater than 40dB, two-tone 3rd order dynamic range is greater than 80dB, and the noise floor for envelope modulated signals is near 0.1┬ÁV. The design may be scaled for any VHF frequency where an overtone crystal is available.