RadioMods President Grant Export Mods page

Modifications

President Grant Export (PC-999) Mods President Grant "Classic" (Grey face, Dual 2312 finals, No ASC, PC999AE board)

Remove white wire from pin foil side of the PLL. Connect cut trace.
Remove second white wire on foil side towards the front of the radio (only other white wire)
Find purple wire behind ABC band switch.
This wire is 3 inches long and has an open end with a piece of clear tubing over the end.
Connect this wire to board ground.
A good place is on the foil side where you took the second white wire off.
The spot closest to the front edge is ground.
That's it!
You now have three bands of 40CH's.
Optional, retune rear slug for max peak power on CH 20.
This slug has white wax on the top, It is tuned for 28mhz, typical 5 watt pep improvement and balanced RF power output across bands.

This mod was sent to me by Clark

I make a special EPROM expansion board that will add 4 more bands to radios that use either Binary or BCD programming, it also adds a 10KHz shift function as well, click here to find out more.

It will give 1 band down, 1 band up, UK 40 (up 64 channels without Alpha ch hops), NZ 40 (down 63 channels) and 10KHZ shift.

On a 40 channel radio it will give coverage from 26.335 to 28.005 (including the normal low,mid and high bands of 26.515-27.855), that is a total of 167 channels !

I can also make a custom board upon request which will give whatever frequency range you want (within the limits of the radio).

Channel Expansion

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 bottom pin on the switch to pin #9.

(If you do not get ALL the new channels adjust the VCO coil, L-18)

ŻWith 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 25 = 26.485
13 = 26.345 18 = 26.405 22 = 26.465 26 = 26.495
14 = 26.355 19 = 26.425 23 = 26.495 27 = 26.505
15 = 26.365 20 = 26.445 24 = 26.475
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 'peak & tweak'

MODULATION - Adjust VR-14
AM POWER - VR-13
SSB POWER - VR-12

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