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Install capacitor pairs C37/C114, C34/C35, and C39/C115. Some of these capacitors may not be
used at the IF frequency employed in your rig. Unused capacitors are shown on the schematic
with a value of 0 pF.
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Install crystals X6 and X7. Place a spacer (made from brown 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 each 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 – Connect a speaker or headphones to the "SPKR" jack. Apply power to the board.
Connect an antenna to the output side of capacitor C39. Listen to the restricted noise
bandwidth due to the crystal filter. If doing this test in the evening, you may be able to hear a
shortwave broadcast station on the IF frequency of your rig.
Your Measurements/Observations - ______________________________________________
____________________________________________________________________________
- Figure 11 -
13
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