|The Phototransistor at the VFO Amplifiers is not installed. A 8 1/2" wire is connected to the "E" terminal of the Phototransistor footprint. The other end of the wire is connected to an SPST switch at the VFO.
Shows the Photodiode on the VFO Section and IR LED on the Bandpass Section that are not installed. A wire is soldered to the "A" terminal of the Photodiode footprint that goes to a SPST switch to control VFO switching.
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