The scanner uses a stereo 3.5 mm headphone output. The middle contact is made available for the
discriminator output. The SMD resistor (see circle) needs top be removed. A 10 k resistor is soldered to the left solder pad
(see arrow). The resistor is fixed to the PCB by a little glue from a glue gun. The resistor's other lead is connected to the wire running from LND9.
Using a stereo 3.5 mm plug, the headphone signal is available between the tip and ground. The discriminator output is available
between the middle ring and ground.