Uniden Bearcat BC145XL / UBC145XL
The Uniden Bearcat 145XL is a vintage 16 channel scanner. There is ample space to equip it with a discriminator output.
The receiver IC is an MC3359. The unfiltered audio can be found on pin 10. It's quite strong, which could damage a computer's soundcard. Therefore, an attenuation of about 50% is created by a two resistor voltage divider.
Pin 10 of the MC3359 contains the unfiltered audio
The components at pin 10
Follow the next steps to make the discriminator output:
Chassis socket in the scanner's back