1.

Locate and remove capacitor C73 at pin 12 of the LC7131 PLL chip.

2.

Solder the expanders green wire to a 22pf capacitor, and the other leg of the capacitor to pin 12 of the LC7131 IC.

3.

Solder the white wire to the ceramic filter CF-3. This is the trace where C66, R109, and C21 connect.

4.

Solder the expanders red wire to the + 13.8 VDC at the on-off switch.

5.

Solder the black wire to circuit board ground.

6.

Solder the small 100 pf capacitor (enclosed) across filter CF-1. This filter has three legs, and the center pin is grounded. The small capacitor should be soldered across the outside pins of CF-1. If a squealing noise is encountered in receive, solder a 1k resistor in series with a 22 pf capacitor, and solder them across filter CF- 1. (leave off the 100 pf capacitor above)

See Uniden PC-33 for details.