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Uniden Bearcat BC125AT / UBC125XLT



BC125AT

The UBC125XLT and its US equivalent BC125AT 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

BC125AT

The scanner can be opened by removing 6 screws. The circuit board containing the key contacts and the display can be removed by unscrewing 2 screws as indicated on the board.

To access the receiver board, detacht the metal shield by removing another two screws.

top circuit board
remove the metal shield
Unscrew these two..
..and these two screws
disc
discriminator output
Point 'DISC' carries 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 indicated SMD resistor (marked '100')
  • Connect the other end of the wire to the left 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
This SMD resistor has to be removed..
..and the wire can be connected to the left solder pad


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