The Uniden BC100XL is an almost antique 16 channels scanner. Thanks to the spacious layout, it's not to difficult to equip it with a discriminator output.
The receiver IC is an LSC1359, which is identical to the MC3359. The baseband audio can be found on pin 10.
Pin 10 of the LSC1359 contains the unfiltered audio
The 10 k resistor soldered to pin 10
A 10 k resistor is soldered to pin 10 of the receiver IC. A piece of insulated wire is soldered to the resistor's other lead.
The scanner's sliding back panel is less suited for mounting an additional socket. Therefore the earphone socket is reused. The white and yellow wires to the earphone socked should be detached, connected together and insulated, e.g. with some shrink tubing.
Once this has been done, the wire running from the 10 k resistor can be connected to the chassis socket.
Reuse of the earphone socket