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Thread: Motorola RIB mods

  1. #1
    Will No Longer Registered

    Default Motorola RIB mods

    rib_mod.jpg

    Note the value changes for R1, 2,3,4,9,10,11,12,14,and 17. Corrects the interface to RS232.
    I will have to email the PDF for the other Mod RIB.


  2. #2
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    In case anyone wonders, Will is the original author of this mod.

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  4. The Following User Says Thank You to Magnus For This Useful Post:


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    I have a original Motorola rib that's never failed to read or write a radio. What does wills mod do?

  6. #5
    Will No Longer Registered

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    Quote Originally Posted by escortX50 View Post
    I have a original Motorola rib that's never failed to read or write a radio. What does wills mod do?
    The RIB design, if you can call it a design, has a serious problem with RS232 Serial compatibility. Works on some computers and not on others.
    The RIB designer did not have a clue about the RS232 standards. So after many problems in actual use, even with the later version RIBs, I did some looking into the problem. The changes are the results of my re-engineering the RIB to match RS232. I even use a 100 foot serial cable to program radios still in vehicles outside the shop.

    I found another problem with the timing on the BUSS lines, and the later drawing shows those changes to correct the BUSS timing.

    Any other questions?

  7. #6
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    Thanks Will. I'll make sure I bookmark this incase I do run Ito problems in the future.

  8. #7
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    I modded my rib box up to match the changes. thanks Will and Magnus

    part changes

    old/new
    R1 4.7k - 9.1K
    R2 20K - 47K
    R3 4.7k - 10K
    R4 4.7k - 9.1K
    R9 4.7k - 10K
    R10 4.7k - 10K
    R11 2.0k - 1k
    R12 4.7k - 10K
    R14 2.0k - 1.5k
    R17 4.7k - 20K

  9. #8
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    Default Motorola RIB mods

    Is the SRIB all FUBAR too? I have the D version.

  10. #9
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    I use a Polaris PA-2 and have not had any problems.
    Common sense is Uncommon.
    You can't fix stupid, but eventually it takes care of itself.

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    If you look at the changes they basically clean up the transistor switching. the transistor is more able to see a "high" or "low" input. to check out the srib you would have to look at the diagram or post it here and someone can issue an opinion

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    rln4008d4.gif
    I ADD C6~C15 22OP

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    Some problem with Maxtron 0707 RIB modified rev 1.pdf
    ICL7660 output is -5VDC (pin4)

  14. #13
    4n6inv No Longer Registered

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    I've been in a RIB resurrection mood lately and did Will's mods - above - to bring a Motorola "E" Rev back to life and to work properly. I have experienced issues with the true Motorola RIB not working on occasion with various computers. Not only did Will's mod bring my dead RIB back to life; I've tried it in a number varying computer situations in the past couple of weeks. Not a single hiccup. Tastes great; less filling.

    I'm curious as for the reason to add the 220pF caps to ground. Looks fairly easy to accomplish; but was curious as to the benefit, or any issues that it eliminates. I haven't read any comments in follow-up or an explanation. It may be so obvious that you laugh, but I'm just getting my feet wet in modifying actual hardware within the past year. And; I'm assuming from the looks of the schematic; this is a Motorola RIB?

    Thanks!

  15. #14
    Will No Longer Registered

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    The 220 pF chip capacitors were added in later models as a RF suppression aid. I have not needed the caps and we do use a 25 or 50 foot RS232 cable from the computer out to the RIB and the radio in the vehicle outside.

  16. #15
    4n6inv No Longer Registered

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    Right again! My "E" Rev already has the caps installed. Cool. Thanks, Will.