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Wanted to buy Uniden Grant XL mode Switch

Discussion in 'CB Radio Gear SwapShop' started by Low_Boy, Sep 5, 2018.

  1. 338_MtRushmore

    338_MtRushmore Sr. Member

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    If the numbers corespond exactly, there is a good possibility it is the same, and a little testing could likely confim. If the numbering is different, there may be a part number that you could look up the terminal numbering.

    Like I said, it is a stab in the dark, but would only take a few minutes to confirm or eliminate the possibility.

     

  2. Low_Boy

    Low_Boy Well-Known Member

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    This will be fun. The new switch is totally different. Wafer 1 and wafer 2. Would wafer one be closesr to the front?
     
  3. nomadradio

    nomadradio Analog Retentive

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    The two wafers are the same, but you only need one of them.

    The original switch has only four circuits. The new one has four circuits on each of the two decks.

    73
     
  4. Low_Boy

    Low_Boy Well-Known Member

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    Thanks Nomad
     
  5. 338_MtRushmore

    338_MtRushmore Sr. Member

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    Red is common, yellow is usb, blue is AM, pink is lsb. pattern repeats as you go around. It is marked on the back of the switch, and I verified with dvm. Inked20190210_132330_LI.jpg
     
  6. 338_MtRushmore

    338_MtRushmore Sr. Member

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    switch.jpg
     
  7. Low_Boy

    Low_Boy Well-Known Member

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    388_MtRushmore Thank you. You took all the guess work out of this for me. All day at work I was thinking about this. My guess that the color wires were usb, lsb and am. I was thinking about clamping the switch together so I could probe this and find the modes. Hopefully I can work on this tonight and tomorrow night wrap it up and post the outcome.
    Thanks again. You went above and beyond .
     
  8. 338_MtRushmore

    338_MtRushmore Sr. Member

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    Trying to test a bad switch is no fun at all. I was very confident there were only 2 options for the common pin due to lack of connections of two pins. It turns out only 3 circuits are actually used. Who'da thunk it?
     
  9. Low_Boy

    Low_Boy Well-Known Member

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    After probing the new switch i come up with.
    USB (4,3) (13,17) (12,13) (9,8)

    AM (4,3) (18,16) (13,11) (9,7)

    LSB (5,9) (4,1) (18,14) (13,10)
    Now I am a bit confused what to do with all this and what MT_Rushmorr gave me
     

    Attached Files:

  10. 338_MtRushmore

    338_MtRushmore Sr. Member

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    I would draw it out, it makes it easier to see. If the numbers above are correct, the switch is not the same as the one nomad posted. You have 4,3 listed under 2 different switch positions?
     
  11. Low_Boy

    Low_Boy Well-Known Member

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    Somehow I screwed up that should be 4,2 for AM. I can not edit that.
     
  12. 338_MtRushmore

    338_MtRushmore Sr. Member

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    Ok, if the first circuit is correct, there are a few off in the others, but not a big deal.

    Think of them as individual switches. You are now 1/4 done. You can take the pins I colored and call those your first circuit. Then just move to the next circuit and do the same.

    Pay attention to the needed jumper at the top too. Those on the lower left circuit can just be put on the lower right circuit, and only use 3 circuits.

    Take lots of pics before you start, and try to label the wires or have a way to identify where they were in case something goes wrong.
     
  13. 338_MtRushmore

    338_MtRushmore Sr. Member

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    I think 13,17 should be 18,17. Otherwise it should be correct, I think.
     
  14. Low_Boy

    Low_Boy Well-Known Member

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    Ok i re did the ehole thing and it is making more sense to me now. I realize pins six and 15 are blank. So for 9 13 and18 are all common if you look in the rows below
    USB (3,4) (8,9) (12,13) (17,18)
    AM (2,4) (7,9) (11,13) (16,18)
    LSB (1,4) (7,9) (10,13) (14,18)
    It took a few times to see 15 and 6 are missing tabs. I think this is it. So there are 4 different positions on a three position switch. Hmmm.
     
  15. Low_Boy

    Low_Boy Well-Known Member

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    No way to edit i am doing this on my phone so my fingers are too big LSB should be 5,9.
     

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