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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. Low_Boy

    Low_Boy Well-Known Member

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    I am looking to buy a Uniden Grant AM, upper side band, lower sideband mode switch if you have one get back to me please


     

  2. nomadradio

    nomadradio Analog Retentive

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    NZ8N likes this.
  3. loosecannon

    loosecannon Sr. Member

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    thanks for that link nomad!

    just bought 10 of them!
    LC
     
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  4. Low_Boy

    Low_Boy Well-Known Member

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    Thanks nomad.
     
  5. Low_Boy

    Low_Boy Well-Known Member

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    Just ordered one and a spare. They seem to go bad on 148 GIRl'S also.
     
  6. Low_Boy

    Low_Boy Well-Known Member

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    Supposed to say GTL and for some reason i can not fix it. Stupid spell checks on these phones.
     
  7. Low_Boy

    Low_Boy Well-Known Member

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    I also noticed the same seller has the three position switch for a 148 GTL.
     
  8. nomadradio

    nomadradio Analog Retentive

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    They sell both a single-deck 4-pole, 3-position switch and a two-deck version with 8 poles.

    The 148 might get away with the single-deck one with 4 circuits. But a Cobra 2000 needs more than that.

    Could be the simpler one will work. Just be sure to copy any pics on the sale listing that show the internal hookup to the pin numbers. Won't always be numbered the same as the original switch.

    That is, if the original switch has any numbers on the lugs.

    73
     
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  9. Low_Boy

    Low_Boy Well-Known Member

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    The fun part will be getting this hooked up when it shows up.
     
  10. nomadradio

    nomadradio Analog Retentive

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    Here is the two-deck 8-pole switch For the single-deck version, just use the top half of the schematic.

    73
     

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  11. Low_Boy

    Low_Boy Well-Known Member

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    thank you
     
  12. Low_Boy

    Low_Boy Well-Known Member

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    Hopefully Nomad reads this or somebody way smarter than me. I am getting ready to install this switch and I am totally lost.
     

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  13. nomadradio

    nomadradio Analog Retentive

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    Whoa! Forgot the mode switch in that model is on a pc board.

    First need to identify the 'common' pin for each of the original four circuits on the original switch. Those will translate to pins 4, 9, 13 and 18 on the new one.

    Identifying which pin is USB, AM and LSB on each of the four circuits would be next. The wires would have to be cut from the pcb-transition connector, stripped and soldered to the lugs on the new switch.

    Naturally testing for continuity to do this may not work if the switch is bad. If it has one good section, the pattern for which pin is which mode should hold for the other three sections, though.

    Not quite a chinese puzzle, but close enough.

    At least the old one is arranged as four sets of four pins.

    73
     
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  14. 338_MtRushmore

    338_MtRushmore Sr. Member

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    It would be a stab in the dark, but I would remove the switch from the board and pray the terminals were numbered. If that didn't work it would be time to reverse engineer the whole thing.
     
  15. nomadradio

    nomadradio Analog Retentive

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    Don't count on the numbering being any help. Numbers on the old switch may or may not correspond to the numbers on the new one.

    73
     

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