2 VRMS INTO 50 (1

2 VRMS INTO 50 (1

Fig 9—75-meter RF mixer and 80-mW output amplifier.

The 15-ohm resistor ensures that U16 will riot oscillate if the load is reactive. This op arnp is rated to supply 100-milliamps peak output current at frequencies up to 6 MHz. I was able to get 60-milliamps peak at 4 MHz without obvious distortion. This works out to 80 milliwatts into a 50-ohm load.

The VFO is a transistorized T195 VFO (3), with the capacitance in the tank circuit reduced to raise the fre-

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