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Uniden/Bearcat UBC760XLT


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


If you remove the bottom of the scanner and disconnect the loudspeaker connector, the MC3359 is easily reachable.

A 10 k resistor is connected to pin 10 of the MC3359. Pin 10 is on one of the corners of the IC. The other lead of the resistor is connected to a short piece of insulated wire, which is connected to a chassis terminal in the back of the scanner. Because of the metal back panel of the scanner, a separate ground connection of the chassis terminal is not required.



Pin 10 of the 3359 contains the basband signal

A 10k resistor connects the discriminator to the outside world

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