It's not too difficult to equip the GRE PSR-282 with a discriminator output. The receiver IC can be located underneath the 10.245 MHz crystal. It's a 3361, with the unfiltered auio at pin 9. There is no need however to solder to this IC. Pin 9 has a direct connection with test point TP5.

PSR-282

Test point TP5

The connection to TP5

Follow the next steps to make a discriminator output:

• Disconnect the loudspeaker contact. This gives you more space (see right picture)
• Solder a 10 k resistor to TP5
• Connect the resistor's other lead to a piece of insulated wire
• Solder a second wire to ground, e.g. to the metal housing of a coil
• Place a 3.5 mm mono chassis socket in the scanner's back and connect it with the two wires
• Don't forget to reconnect the loudspeaker contact