This image shows the coax cable connecting the "Xtal Filter Out" to the "Xtal Filter In" from Board 1 to Board 2. Shielded cable should always be used here, or the second mixer will pick up all kinds of signals.
The connection at the end of the Crystal Filter on Board 1. The phone jack is the speaker connection soldered to the ground plane on Board 2.
The connection to Board 2 at the input to the Second Mixer.
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