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Adding a discriminator output to the Uniden Bearcat 175XL is relatively easy. The receiver IC is a dual in line (DIL) type. It's a MC3359, with the unfiltered audio at pin 10.




Pin 10 of the 3359 contains the baseband signal

Close-up of the connection to the IC

A 10 k resistor is soldered vertically to pin 10 of the MC3359. Pin 10 is on one of the corners of the IC. The core of a small strand of shielded wire is soldered to the resistor's other lead. Its braid is soldered to the metal shield of the coil with the green core nearby.


A 3.5 mm chassis terminal is mounted in the back of the scanner, e.g. above and between the earphone and DC connectors. The chassis terminal is connected to the shielded wire.

Overview of the discriminator output

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