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Uniden Bearcat BC75XLT



UBC75XLT

The BC75XLT is a modern scanner, that combines 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

BC75XLT
top circuit board

The scanner can be opened by removing 6 screws. The circuit board containing the key contacts and the display can be removed by unscrewing 4 screws as indicated with the blue arrows.

To access the receiver board, detach the metal shield.

Remove these four screws
 
Pin 10
Resistor
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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