Uniden President Jackson-DX Mods (export version)

President Jackson Export Mods


This is the EXPORT Jackson

President Jackson Extra Channels

METHOD ONE:

~~~~~~ PLL Conversion ~~~~~~

1)Locate IC-7 and IC-5.(There near the PLL chip)
2)Found them??...Good! Lets start with IC-7
3)Cut the trace going to PIN #2.
4)With a SPST switch (We'll call this switch 1) solder both sides of the cut trace to each leg of the switch.
5)Now on IC-5 cut the trace going to PIN #12.
6)With another SPST switch (We'll call this switch 2) solder both sides of the cut trace to each leg of the switch.
7)Now mount the 2 switches somewhere in the radio.

The Results

If all is done right SWITCH 1 will give you:
25.425 - 25.865 MHZ on channels 1 to 40 on Band 'A'
25.875 - 26.045 MHZ on channels 1 to 15 on Band 'B'

Then you can use SWITCH 2 with SWITCH 1
25.295 - 25.415 MHZ on channels 16 to 27.on band 'A'
The other 'Bands' are not affected with this mod.

~~~~~~ Crystal Conversion ~~~~~~

1)Find the 14.550 MHZ crystal in the radio.
2)You can change this crystal to 15.450 and get 26.965 - 29.185 MHZ.
3)You can change this crystal to 15.000 and get 26.515 - 28.745 MHZ.
(By +/- .450 MHZ to the crystal you can move up/down a full band.)


President Jackson Clarifier mod

NOTE: You will be working on the 'Fine'clarifier control

1)Cut D-58.
2)Find the BROWN wire from the clarifier knob and cut it just before it connects to the P.C.B.
3)Solder this wire to 8 VDC.
HINT:You can find 8 volts at the 2 holes in the PCB at the front edge.
4)Find the WHITE wire from the clarifier knob and cut it just before it connects to the P.C.B.
5)Solder a 470 OHM resistor to the and then solder the resistor to GROUND
If all is right you should have +/- 2.2 kc of slide.


President Jackson MIKE wiring

mic plug


President Jackson 'PEAKs & TWEAKs'

MODULATION - Cut TR-41
AM POWER - ????
SSB POWER - Cut TR-37

~~~~~~ AGC Modification for SSB ~~~~~~

1)Change R-43 (10k ohms) to 1k ohm.
2)Change R-41 (150 ohms) to 270 ohms.
3)Change R-47 (1.50kohms) to 3.9k ohms.
4)Remove capacitor C-31.

Now strong SSB signals should be clear and not distorted.

~~~~~~ Roger Beep delay ~~~~~~

1)Remove R-168 (47k ohms) and install a 56k ohm.

~~~~~~ Talk Back ~~~~~~

1)Cut D-71.
2)Solder a wire from PIN 1 of IC UPC-1242H (audio chip) to PIN 2 of the mic socket.
3)IF...the talk back is to loud then install a 100 -500 ohm resistor in series to the mic socket.
4)IF...the receive audio drops then install a .01 uF ceramic disk capacitor in series to the mic socket.

home projects SS 121 CHEROKEE
858MOD 3900 MB8719 2816MOD
GRANT-DX JACKSON-DX 5080 PLL SEARS
LINKS GALAXY TS-5010 PLL 02a mods
DeerSlater 240 Ham Radio Mods


Please report any viewing troubles.
Comments or suggestions regarding these Web pages are welcome.
Email Webmaster.

1