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Install crystal X8; it will be the last one marked LO or XX. Place a spacer over the crystal leads
before soldering it to the PCB. 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 TxLO output at the top of resistor R8 with a
suitable device. Either an oscilloscope or RF Probe with readout device can be used.. Jumper
the "Key" pads together to key the transmitter. The RF probe should show an output level of
approximately 0.7 volts. On the oscilloscope, the waveform should approximately match that
shown in the next figure.
- Figure 34 -
- Figure 35 -
30
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