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Your Measurements/Observations - ______________________________________________
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Receive Main Crystal Filter
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Install capacitor pairs C36/C111, C53/C56, C55/C113, C54/C57 and C52/C112. 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 X1, X2, X3, and X4. 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 the case of each
crystal with a short piece of wire to the provided, adjacent ground pads.
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 right pad of C52 or to the upper pad where R37 will be installed. You
should hear band noise, mostly static, at a loud level and very restricted in bandwidth due
to the action of this crystal filter.
- Figure 13 -
15
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