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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.

These screws are removed
DISC out
discriminator output
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:
  • Solder a 10 k resistor to test point 'DISC'.
  • Connect a piece of insulated wire to the resistor's other lead
  • Remove the SMD resistor (marked '100'). It can be found above the display on the other circuit board
  • Connect the other end of the wire to the right cleared solder pad
Using a stereo 3.5 mm plug, the headphone signal is available between the tip and ground. The discriminator output is available between the middle ring and ground.
Pin 10
discriminator output
The SMD resistor is removed..
..and the wire is connected to the cleared solder pad

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