CB Modifications This Information Is Supplied For

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CB ModificationsSida 1 av 8CB ModificationsThis information is supplied foreducational purposes onlyPlease Remember this information is for educational purposes only and isnot an endorsement of the information supplied.I assume no liability or responsibility with respect to the use of suchinformation.Expanding the MB8719Models include:- Uniden Grant/Madison, Cobra 148/2000 GTL etc.Note: Some newer Uniden's now have the RCI8719 'clone' Pll. You willhave to replace the PLL with the old MB8719 BEFORE attempting thesemods.To get coverage from 27.455 - 28.045, find the MB8719 PLL, then locatepins 10,11and 12. Cut the track going to these pins. Locate a ground (chassisor track) .Using a DPDT Center off switch, connect the switch to pins10,11,12(IC side of the cut) on the MB8719 PLL.This Mod will give you thenormal 'FCC' channels in the center position. In the Down position 27.605 28.045, In the up position 27.455 - 27.605( on channels 2 -14).See diagrambelow.Further expansion can be done by replacing the loop mixer crystal, givingyou a new set of 40 channels per crystalhttp://4.3.101.244/mods cb.html2004-04-07

CB ModificationsSida 2 av 8Expanding the Cobra 148GTL-DX/Superstar 360FM(PB010)Clip off the YELLOW, WHITE, & PINK wires from the ch.9 panel switch.Reconnect WHITE & PINK together for normal LED channel display. Cutoff the GRAY wire from the HI/LO TONE panel switch. Remove thegrounding jumper at pin 9 of the MC145106 PLL chip. Connect a small barewire between the center terminals of the now free poles of the CH.9 &TONE switches. Add the two 1N914 diodes and additional switch wiring asshown belowThe extra frequencies will now appear in the Ch.12-40 positions of theCHANNEL SELECTOR with the BAND selector in the HIGH position. (Thefirst 11 channels are repeats of existing channels.)The "ch9" positionactivates the expansion. In the LO TONE position you will get 28.195 Mhz(ch.12) to 28.495(ch.40).if you pull IC7 pins 4 & 2 HIGH at the same timeyou will get coverage up to 28.705 Mhz. This would need a three positionswitch.Emperor 50101. Remove the four screws holding the bottom cover in place.2. Lift the bottom cover enough to clear the case and slide it to the sidewhile being careful not to detach the speaker wires.3. You should now see the PLL/CPU board at the front of the radio.4. With the front of the radio facing you, locate R539 and R540 at thelower right corner of the large chip(HD614081), R539/R540 are sideby side and very small.5. Remove R539 and R540. You now will get 26.500Mhz to 27.999Mhzplus the 'FCC' band in nine bands.http://4.3.101.244/mods cb.html2004-04-07

CB ModificationsSida 3 av 8Galaxy 991. Remove the case and find the small circuit board (EOT004410Z)connected to the left side of the radio as viewed from the componentside of the main chassis.2. Find the wire that is connected to this circuit board(in step 1).Removethis wire.3. Remove the small screw that holds the small board on to the chassis.4. Under this board you will find a 7 pin plug that is not connected toanything. Insert this plug into the empty socket on the small circuitboard.5. Replace screw back into the small board and close case.MC145106 PLLThis PLL includes the following models.Browning Mark 4A, Dak Mark V,Robyn 440, Dak Mark IX, Lake 600, Palomar SSB500 (late), Regency CB501,SBE 54CB, Keycomm 1000Also these UNIDEN 'clones' use this chip.Connex 3300, Excalibur base,Excalibur Samurai, Galaxy 2100, Galaxy II, Galaxy Pluto, Galaxy Saturn,President Franklin, Superstar 3600, Superstar 3900, Super Galaxy, TexasStar.This PLL is getting used in a lot of newer radio's. It often has a pair ofMC14008 binary adders to extend the amount of channels available.The PLLuses 9 bit binary programming with internal pull-down resistors.Modifications are possible by changing the programming of pins 17(P0) topin 9(P8) or changing the mixing crystalPLL02AThe PLL02A is the worlds most popular chip used in all the Cybernetchassis. It is simple to modify by changing

Models include:- Uniden Grant/Madison, Cobra 148/2000 GTL etc. Note: Some newer Uniden's now have the RCI8719 'clone' Pll. You will have to replace the PLL with the old MB8719 BEFORE attempting these mods. To get coverage from 27.455 - 28.045, find the MB8719 PLL, then locate pins 10,11and 12. Cut the track going to these pins. Locate a ground .

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