1)The switch needed is a SPST/CENTER-OFF type.Mount this in the radio somewhere.
2)Find the PLL MB8719 chip.Find pin #11 and cut the trace going to it on the foil side of the PCB.
3)Solder a 4.7k ohm resistor across the cut that you just made.
4)Now you are ready to attach the wires from the switch to the locations on the PCB.
5)Solder a wire from the top pin on the switch to PCB ground.
6)Solder a wire from the middle pin on the switch to pin #11.
7)Solder a wire from the tbottom pin on the switch to pin #9.
(If you do not get ALL the new channels adjust the VCO coil,l-18)With the switch in the UP position:
12 = 27.875 17 = 27.935 22 = 27.995 26 = 28.035
13 = 27.885 18 = 27.945 23 = 28.025 27 = 28.045
14 = 27.895 19 = 27.955 24 = 28.005 28 = 28.055
15 = 27.905 20 = 27.975 25 = 28.015 .
16 = 27.925 21 = 27.985 .With the switch in the CENTER position is regular channels
With the switch in the DOWN position:
12 = 26.335 17 = 26.395 21 = 26.455 24 = 26.475
13 = 26.345 18 = 26.405 22 = 26.465 25 = 26.485
14 = 26.355 19 = 26.425 23 = 26.495 26 = 26.495
15 = 26.365 20 = 26.445 27 = 26.505
16 = 26.385 .
President Grant SLIDER mod
1) Cut D-45.
2) Find D-79 and jump it (Solder a wire across it)
3) Remove r-120 and replace it with a 470 ohm resistor.
4) Find the BLUE wire from the clarifier knob and cut it just before it connects to the PCB. Solder it into the hole that is next to where R-120 is.
5) Find the GREY wire from the clarifier knob and cut it just before it connects to the PCB. Solder it to a constant 8.5 volt supply.(This can be the center pin of TR-39 )Hopefully this should give you about 3 khz of slide.
President Grant MIKE wiring
President Grant 'peak & tweak'
MODULATION - Adjust VR-14
AM POWER - VR-13
SSB POWER - VR-12
