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Posted on June 27, 2023June 28, 2023

S-Pixie: Receiver Mixer Analysis and Testing

In the S-Pixie, the portion of the circuit including Q2 (8050 datasheet) serves dual purposes. It’s a mixer when receiving and a power amplifier when transmitting. Here is the relevant portion of the mixer circuit. When transmitting, the 10k resistor is shorted out by the CW key (not shown in the schematic above), biasing the …

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