FILE NAME: PRO2006.001 @ VE3EUK REQMOD To enable the Radio Shack PRO-2006 scanner to monitor the cellular phone frequencies (870.030-879.360 System A Base) (880.650-889.980 System B Base) and the actual mobile telephone frequency (825.030-834.360 System A Mobile) and (835.650-844.980 System B Mobile) do the following: 1. Remove the top cover only. It is held by the 2 screws on back. 2. Looking behind the metal plate covering the front panel, look at your left top corner. You will see 2 glass diodes sticking out of the PC board (PC-3). The one at the bottom is labeled D502. 3. Simply cut the lead on the diode (D502). Turn the radio on and program the limit search memories with the ranges indicated on top. The System A and B Base are the ones to listen to. The reason is that you'll be able to hear both sides of the conversation. If you try listening the Mobile signal, you'll only hear the signal being sent out by the actual phone. Also the signal on the cellular phone is only a measly 4 watts. This mod is so simple, you can do it in less than 3 minutes. Only a small cutting plier is needed, as well as the screwdriver. This information is intended for BBS users outside the USA. Since the US has a really dumb law called the E.C.P.A (Electronics Communications Privacy Act), it basically prohibits listening in on a variety of radio signals which are not intended to be listened by the general public and has been deliberately encoded, scrambled, or just deliberately used to ensure privacy. So, if you live in the US, don't do this mod. 73's Ramon (WP4XQ@WP4XQ.PR.USA.NA) PRO2006.1 Radio Shack PRO-2006 Scanner Mods by Mark A. Day N4OQK @ CHO Introduction The PRO-2006 is probably the worlds most versatile scanner to date. Modifications are easily implemented, and upgrade performance over stock units tremendously. Enjoy, and keep scanning! Mod#1 : Cellular restoration Parts : NONE To restore the missing CMT frequencies, merely clip diode D502. It is located in the upper left corner of the CPU/display board. Mod#2 : Scan rate increase Parts : 16Mhz. Quartz Crystal - fundamental cut Replace CX503 (12Mhz) with a 16Mhz crystal, clip diode D503 (near D502) The unit now scans at around 40 channels per second. Mod#3 : Squelch hysteresis suppression Parts : 100-200K ohm 1/8w resistor Locate R152 (33K) on the linear PCB (main board). This is a tricky resistor to get to, since it is on the bottom side of the board. Remove this resistor, and replace it with a 100-200K resistor. The higher the resistance, the less hysteresis will be present. I found 100K gave me all the razor-sharpness I was looking for, without sacrificing performance. Mod#4 : "S" meter output Parts : 10Kohm 1/8w resistor, 0.1 uf capacitor Locate D33 on the linear PCB. Solder in the 10K resistor to the ANODE of this diode. Note this is not the same as TP2. Connect a wire from the free end of this resistor to a rear panel jack (RCA). Solder the 0.1uf capacitor from the jack's center terminal to ground. Output on this jack follows the AGC voltage. Negative for no signal, goes positive when a signal is present, increasing with signal strength. A 1Volt full scale panel meter makes a good "S" meter Mod#5 : Increased headphone audio Parts : NONE Locate resistor R228 (27 ohm) on linear board (near IC7). Remove this resistor and replace it with a jumper wire. PRO2006.2 Mod#6 : 6400 channel memory capacity (ADVANCED TECHNICIANS ONLY!) Parts : Hitachi HM62256LFP-12 (256Kx8 SRAM) or equivalent (flat pack required) 4 Position DIPswitch 10KOhm resistor SIP (or 4 10K 1/8w resistors) This modification is complicated, so don't try it if you're not fully sure of youre ability. 1) Remove front panel from scanner, disconnect wiring harnesses. You will lose all current programs (Sorry!) 2) Remove metal shield from panel CAREFULLY! Remove screws holding CPU board in front panel. Carefully separate CPU board from keyboard. 3) Locate IC505 next to CPU and remove it from the board. Notice this is a 24pin IC, and that there are 4 extra pads to the top of pin 1. All pin numbers given hereafter will refer to the new 28 pin IC, with pin 4 being the old IC's pin 1. Follow me? The pads for the new IC are already present. 4) To adapt to the new RAM, a few traces must be sliced. A) Slice the trace connecting pin 28 to pin 26 B) Slice trace connecting pin 27 to pin 23 (bottom of board) C) Slice trace connecting pin 2 to ground (bottom of board) 5) Install the new RAM, and connect a jumper from CPU IC501 pin 67 (+5V) to pin 28 of the new RAM. 6) To address the extended memory, external switches must be added and connected to the unused address lines of the new RAM. Just how you implement this is up to you. Regardless of how you do it, you will need to connect a wire bundle from the new RAM pins 1,2,23,26 to the outside world. I mounted a jack on the rear panel into which a 4 position dipswitch can be mounted. 7) Add pullup resistors from new address lines to +5V, available at pin 3 of the +5V regulator IC8. 8) Reassemble unit, installing all shields and ground straps. 9) Testing & checkout A) With all switches 'OFF' enter '1000.000' into memory channel 1. B) Toggle switch 1 to on and return to channel 1. Enter '1001.000' C) Repeat for all switch combinations. Lockout channel 1 in each of the 16 memory blocks. You now have a coded channel to key you in on which block you're scanning. D) Enjoy 6400 channels of pure scanning power! You now have: 16 Blocks of 400 memory channels per block 160 Search ranges (10 per block) 160 Temporary scratchpad channels (10 per block) Notice that custom settings (delay/mode) are unique to EACH channel, but priority and speed are common to all blocks. You might dedicate a common channel in each block to be the priority channel PRO2006.3 From: KA4NMX@KD4OM.#HKY1.NC.USA.NA Pro-2006 Modifications Note: The Electronics Communcations Privacy Acot of 1986 makes it unlawful to monitor mobile telephones, including Cellular. The Following modification is intended only to restore contin- uous 760-1300 MHz coverage as originally provided by the design of the PRO-2006 Microprocessor. 824-851, 869-896 MHz Freq Restoration : Tools Requires: small phillips screwdriver, small wire cutters. Procedure: With power cord unplugged, remove the two rear cab- inet screws holding the upper cover. Lift off the upper cover, being careful not to stretch the speaker leads. Examine the inner, right-hand-corner of the front panel to find two glass diodes, labelled D503 (upper diode) and D502 (lower diode). Using the clippers, very carefully snip the visible lead of the lower diode (D 502) at its bend and slightly separate the cut ends. Reassemble, plug in AC cord, turn on scanner, and Press RESET. Keyboard Beep Delete With the top cover off as described above, locate connectors CN3, a 15-pin connector with colored wires at the front of the main circuit board. There are two procedures which will stop the beep tone from being heard through the speaker; read both to decide which procedure you want to follow. (1) Find the center gray wire coming from CN3 and cut it midway to disable the beep tone. You may wish to solder a resistor in series to reduce the beep volume, a trimpot tovary the volume of beep tone, or a miniature switch to choose between beep and No beep .....! (2) Using a pair of needle-nose pliers, CAREFULLY pry the plug from CN3, revealing a row of pins. Locate the center pin ( #8 ) which corresponds to the gray wire and bend it down flat, dis- abling the beep ........ This is a great scanner. Have fun with it. 73's KA4NMX... Radio Shack PRO-2006 Scanner Mods by Mark A. Day N4OQK @ CHO Introduction The PRO-2006 is probably the worlds most versatile scanner to date. Modifications are easily implemented, and upgrade performance over stock units tremendously. Enjoy, and keep scanning! Mod#1 : Cellular restoration Parts : NONE To restore the missing CMT frequencies, merely clip diode D502. It is located in the upper left corner of the CPU/display board. Mod#2 : Scan rate increase Parts : 16Mhz. Quartz Crystal - fundamental cut Replace CX503 (12Mhz) with a 16Mhz crystal, clip diode D503 (near D502) The unit now scans at around 40 channels per second. Mod#3 : Squelch hysteresis suppression Parts : 100-200K ohm 1/8w resistor Locate R152 (33K) on the linear PCB (main board). This is a tricky resistor to get to, since it is on the bottom side of the board. Remove this resistor, and replace it with a 100-200K resistor. The higher the resistance, the less hysteresis will be present. I found 100K gave me all the razor-sharpness I was looking for, without sacrificing performance. Mod#4 : "S" meter output Parts : 10Kohm 1/8w resistor, 0.1 uf capacitor Locate D33 on the linear PCB. Solder in the 10K resistor to the ANODE of this diode. Note this is not the same as TP2. Connect a wire from the free end of this resistor to a rear panel jack (RCA). Solder the 0.1uf capacitor from the jack's center terminal to ground. Output on this jack follows the AGC voltage. Negative for no signal, goes positive when a signal is present, increasing with signal strength. A 1Volt full scale panel meter makes a good "S" meter Mod#5 : Increased headphone audio Parts : NONE Locate resistor R228 (27 ohm) on linear board (near IC7). Remove this resistor and replace it with a jumper wire. Mod#6 : 6400 channel memory capacity (ADVANCED TECHNICIANS ONLY!) Parts : Hitachi HM62256LFP-12 (256Kx8 SRAM) or equivalent (flat pack required) 4 Position DIPswitch 10KOhm resistor SIP (or 4 10K 1/8w resistors) This modification is complicated, so don't try it if you're not fully sure of youre ability. 1) Remove front panel from scanner, disconnect wiring harnesses. You will lose all current programs (Sorry!) 2) Remove metal shield from panel CAREFULLY! Remove screws holding CPU board in front panel. Carefully separate CPU board from keyboard. 3) Locate IC505 next to CPU and remove it from the board. Notice this is a 24pin IC, and that there are 4 extra pads to the top of pin 1. All pin numbers given hereafter will refer to the new 28 pin IC, with pin 4 being the old IC's pin 1. Follow me? The pads for the new IC are already present. 4) To adapt to the new RAM, a few traces must be sliced. A) Slice the trace connecting pin 28 to pin 26 B) Slice trace connecting pin 27 to pin 23 (bottom of board) C) Slice trace connecting pin 2 to ground (bottom of board) 5) Install the new RAM, and connect a jumper from CPU IC501 pin 67 (+5V) to pin 28 of the new RAM. 6) To address the extended memory, external switches must be added and connected to the unused address lines of the new RAM. Just how you implement this is up to you. Regardless of how you do it, you will need to connect a wire bundle from the new RAM pins 1,2,23,26 to the outside world. I mounted a jack on the rear panel into which a 4 position dipswitch can be mounted. 7) Add pullup resistors from new address lines to +5V, available at pin 3 of the +5V regulator IC8. 8) Reassemble unit, installing all shields and ground straps. 9) Testing & checkout A) With all switches 'OFF' enter '1000.000' into memory channel 1. B) Toggle switch 1 to on and return to channel 1. Enter '1001.000' C) Repeat for all switch combinations. Lockout channel 1 in each of the 16 memory blocks. You now have a coded channel to key you in on which block you're scanning. D) Enjoy 6400 channels of pure scanning power! You now have: 16 Blocks of 400 memory channels per block 160 Search ranges (10 per block) 160 Temporary scratchpad channels (10 per block) Notice that custom settings (delay/mode) are unique to EACH channel, but priority and speed are common to all blocks. You might dedicate a common channel in each block to be the priority channel