A 10 k resistor is soldered to pin 9 of the MC3361. A 3.5 mm chassis terminal is mounted in the back of the scanner.
The other lead of the resistor can be connected directly with the chassis terminal. There is no need for a separate ground connection, as the
scanner's housing is grounded.
Because the baseband signal contains a 455 kHz IF component, as usual with the MC3361, a 2.2 n capacitor is soldered across the lugs of the chassis plug.
Together with the 10 k resistor, a lowpass filter is created that effectively suppresses the IF component, while leaving the data signal intact.