If you would like to add your own Radioshack modifications to this webpage please let me know.

        Also have other information not included below including PDF Documents which i am making available                                                              upon request:  vo1mds@hotmail.com

 

Realistic PRO-23 

Frequency range:
108–174, 406–512mhz 
806–824, 851–869, 896–956mhz

TEST FREQUENCIES #1 - Wipes memory
2,9,manual, turn ON:
Normal frequencies

TEST FREQUENCIES #2 - Wipes memory
2, 9, and LOCKOUT, Turn ON:
CH15  888.9600 <<<<

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Realistic PRO-34 

INSTALL  D6    - Restores 66-88mhz
REMOVE  D11  - Restores 800mhz 
INSTALL  D13  - Removes Airband
                          - Also may effect 800mhz spacing
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Realistic PRO-37

REMOVE D13 - Restores 800mhz
                        - 30kHz channel spacing
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Realistic PRO-38

2-9-MANUAL turn ON:
Test frequencies

66-88mhz coverage:
Add a jumper to the digital board, connecting the empty pads near the upper left corner of the IC when looking at the board from the component side (display up/speaker down - facing away from you). 

FM "Air-band" coverage:
Add a jumper between pin 67 of the microprocessor and ground.
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Realistic PRO-39

INSTALL  D4  - Restores 66-88mhz coverage
                       - Deletes 30-54 MHz

REMOVE  D6 - Restores 800mhz coverage

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Realistic PRO-43

D2 INSTALL - 30-54mhz
D3 INSTALL - 54-88mhz
D4 REMOVE  - ENABLE 800mhz
D5 INSTALL - 12.5khz step
D5 REMOVE  - 30khz step

Keypad tricks:  
PGM, LIMIT, 870, ENTER, LIMIT, 896, ENTER
Now press the up arrow. 
Will search the cellular range at 30 kHz steps

Now try:  
PGMM, LIMIT, 54, ENTER, LIMIT, 88, ENTER
Again press the up arrow.
Will search low band range of 54-88 MHz at 5 kHz steps


Expanding the PRO-43 frequency range to 6-1000 MHz:
https://www.repeater-builder.com/radio-shack/pro-43/shortwave/pro-43-shortwave-mod.html

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Realistic PRO-51

2, 9, Turn ON - Erase memory

2, 9, BAND or 2, 9, MONI, Turn ON: Display Test

2, 9, Manual, Turn ON: Test frequencies

2, 9, L/OUT, Turn ON: Test frequencies
ch14  66.4500*
ch15  76.8250*
ch16  87.4250*
ch23  888.960*

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Realistic PRO-2004

The following diodes will determine how your scanner will work.

D-510 INSTALLED - 400 memories 
            REMOVE     - 300 memories 

D-512 INSTALLED - 30kHz steps from 825-844.995 and 870-889.995
            REMOVE     - 12.5kHz steps from 825-844.995 and 870-889.995

D-513 INSTALLED - Removes 825-844.995 MHz and 870-889.995 MHz
            REMOVE     - Restores all of 800 MHz band

D-514 INSTALLED - 20 channels per second
            REMOVE     - 16 channels per second

TURBO SCAN:
Replace 7.37 MHz with 10.7 MHz resonator

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Realistic PRO-2005

Remove the top cover
Looking at the rear of the front panel, on the left hand
side, you will see two diodes marked D503 and D502.

Clip D502 

Restores the inhibited 800 MHz frequencies in 30 kHz steps.

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Realistic PRO-2006

Clip D502 = Restore FULL 800mhz coverage
Clip D503 = Scan speed increase

Scan rate increase:
Replace CX503 (12Mhz) with a 16Mhz crystal. 
Will now scan at around 40 channels per second.

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Realistic PRO-2020

There are 2 jumper resistors inside on the logic board, 
you will see there are dotted lines diagonally, 
move the (2) jumper resistors to those dotted lines to 
receive 30-50MHz, or vice versa,

 

30-50MHz is straight across

68-88MHz diagonal 

You can install a switch to select between 68-88MHz and 30-50Mhz.

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Realistic PRO-2021

Clip D-44  Restore 851-866mhz 
Clip D-45  Restore 66-88mhz, will lose 30-54mhz, install switch!

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Realistic PRO-2022

D42 Installed, adds the 68-88 Mhz, removing the US 30-54 MHz low band.


D43 Installed, allowing 800MHz

D44 Installed, deleting the cellular mobile and base frequencies. 
       REMOVED, 806-960 restored, including 30 kHz steps

D45 installed, it makes the cellular 30 kHz increments change to 
12.5 kHz. A switch could be connected in series with one lead of a 1N914 or 1N4148 would allow selection of the 25 kHz step interval spacing.

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Realistic PRO-2026

Cut L201 on bottom of scanner
Allows continuous 806-956 MHz coverage with 30khz step increments.

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Realistic PRO-2030

Locate and Cut L201 
Allows continuous 806-956 MHz coverage with 30khz step increments.

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Realistic PRO-2036

1. Remove all cover screws
2. Remove x4 face plate screws and x1 bracket screw at center
3. Carefully depress the outside edges of faceplate shield and tilt down.
4. Unplug J4 and J5, also ribbon cables J501,J502 and J503
5. Remove faceplate and logic board.
6. Position circuit board so processor is on the left and battery on right.
7. Locate chip resistors marked 104 at circuit board upper right and remove from the circuit board.
8. Install these chip resistors in the x2 empty pads closest to battery.
9. This will restore full 800mhz coverage.

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