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Install resistor R25.
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Install capacitors C25 and C31.
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Install molded inductor L10.
Your PCB should look like that shown in the next figure.
Test – Connect a speaker or headphones to the "SPKR" jack. Apply power to the board.
Measure the mixer drive at the top of resistor R28. It should now show an output level of
at least 0.60 volts peak-to-peak, or 0.27 volts RMS when measured on an oscilloscope and 0.2
volts peak when measured using a typical passive RF probe connected to a DVM. Connecting
an antenna to pin 3 of mixer M1 or the left pad for C37 should provide atmospheric noise
(static) at the audio output.
Your Measurements/Observations - ______________________________________________
____________________________________________________________________________
Receive Post IF Amplifier Crystal Filter
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Install resistor R29.
- Figure 10 -
12
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