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
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