Uniden Bearcat UBC3500XLT / BR330T
The UBC3500XLT and its US equivalent BR330T are modern scanners, that combine a broad frequency range with many functions.
It's not too difficult to equip this scanner with a discriminator output. The existing earphone socket can be reused, so no drilling is required
UBC3500XLT - BR330T
The scanner can be opened by unscrewing 6 screws. This scanner's interior consists of two connected circuit boards.
By removing 6 screws inside the scanner (blue arrows on the photo), the interior can be taken apart from the case and the circuit boards can be separated easily.
Point 'DISC' contains the unfiltered audio
The 10 k resistor connected to the test point
The unfiltered audio can be found at the test point marked 'DISC'. With the next steps, a discriminator output is made:
The SMD resistor is removed..
..and the wire is connected to the cleared solder pad