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Your Measurements/Observations - ______________________________________________
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Transmit Main Mixer
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Install mixer M3. Before soldering all of the leads, make sure it it oriented correctly. A dot on
the part and on the PCB denote the location of Pin 1.
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Install resistor R79.
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 PCB. Connect
an RF probe or oscilloscope to the top of resistor R8. Jumper the "Key" pads together to key the
transmitter. The RF probe should show an output level of approximately 0.2 volts. On the
oscilloscope, the waveform should approximately match that shown in the next figure.
- Figure 36 -
31
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