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bag paper) over the crystal leads before soldering it to the PCB or leave a small space between
the case and the PCB. This will keep the crystal case from shorting out PCB traces. Ground the
crystal case with a short piece of wire to the provided adjacent ground pad.
Your PCB should look like that shown in the next figure.
Test – Apply power to the board. Measure the LO output at the top of resistor R28 with a
suitable device. Either an oscilloscope or RF Probe with readout device can be used. The
output should be at least 1.8 volts peak-to-peak, or 0.60 volts RMS when measured on an
oscilloscope and 0.7 volts peak when measured using a typical passive RF probe connected to a
DVM.
Your Measurements/Observations - ______________________________________________
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Install mixer M1. A black dot on the part and a white dot on the PCB denote the location of
Pin 1. Solder the pin 1 lead only. Reconfirm this part is oriented correctly before soldering the
remaining leads.
- Figure 9 -
11
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