After get rid of the parasitic oscillation, test can be resume. A 27MHz -20dbm and a 28MHz -20dbm signal is feed to the RF and LO port of the mixer, resulting an output of 1MHz low side output signal, the amplitude is about -20dbm, which is 10dbm larger than using PN2222 transistor. The output is quite clean, not much spurious product. The two strong peak on the right side are the RF and LO signal, and IF output on the left side.
A clean looking downconversion using BFR93 transistor mixer.
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