Question about Magnum 257 CB Radio

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Blue lighting Anybody looked at a way to adjust the lighting on the radio's display? I didn't realize there was a problem until I tried driving at night. I really like the radio's display, but in my dark truck it's like having a television on the dash shining in my eyes!

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Change the resistor to a higher value that controls the display If you have a bright dim switch I,e Cobra 29 If not then take to a reputable shop and have them lower the voltage to the displays lighting

Posted on Feb 23, 2013

  • ixphant0mxi
    ixphant0mxi Feb 23, 2013

    ps this shouldnt cost ANY More then 5 - 10 bucks if they tell you more grab your radio and RUN out the door

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My solution is not to use this site. It is another obvious scam to generate funds for your "experts". I had hoped to make contact with other "enthusiasts" and not be solicited for money for help. You might as well go sit at an intersection with a cardboard sign and "beg" for money. I have never seen any of these type sites provide any assistance worth mentioning, much less paying for. bOOmer

Posted on Aug 20, 2008

  • ixphant0mxi
    ixphant0mxi Apr 27, 2014

    another way is too get some window tinting and cover the display dont go too dark as you wont see it in the daylight a medium tint should be fine i went to a auto window tint shop and asked for a scrap piece

  • ixphant0mxi
    ixphant0mxi Apr 27, 2014

    boomer you asked i said a good shop i didnt say a name of any if they charge you more then 5 bucks run out the door the other way is stop by a auto window tinting place and ask for a scrap piece of window tinting that isnt too dark and put over the display unfort the magnum 257 and other versions of this radio there just isn't a simple solution radio to fix the dimmer on them since there is not adjustment

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Posted on Jan 02, 2017

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Have a general lee,use to work,real good an would get out there,been having nutta it here latley.drive a older volvo using mirror mounts,can hear stastic,when i key up lights goes green,needle maxes o


What kind of antenna are you useing?You should be using an adjustable antenna at least 40" long . sounds like you need to adjust your SWR to a proper level of at least 1.5 to 1 you will either need to have someone do this for you or do it yourself. First you need an swr meter,a section of jumper coax and an adjustable antenna. turn your radio on ,key the mic down on channel 40 and write this number down. Now key the mic down on channel 1 and write this number down. Loosen the antenna and bring it up 1/4 inch and repeat the prosess until you get lower the 1.5 and you should be good.

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I have a Model WR-100, the blue neon light stays o...


On the radio...
  1. Press the "Menu" key.
  2. Press the down arrow until you see "Light" displayed on the LCD.
  3. Press the "Select" key.
  4. If "BLT ON" is on the LCD, press the up arrow until you see "BLT Norm".
  5. Press the "Select" key.
  6. Press the "Menu" key.

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I have a Mitsubishi RPTV. Everything looks fine except for the blue colors look blurred. I have tried software convergence but the blue still looks blurred and strange. What can I do?


ADJUST THE ELECTRICAL FOCUS. AND THERE IS A MECHANICAL FOCUS ALSO. SET THE ELECTRICAL FOCUS BY LOOKING DIRECTLY INTO THE TUBE AND ADJUST IT SO THE TUBE SURFACE IMAGE IS SHARPEST. THEN LOOKING AT THE REAR OF THE SCREEN ADJUST THE MECHANICAL FOCUS, ON THE LENS UNTIL IT IS SHARPEST. ALSO IT MIGHT NEED A CLEANING OF LENS&MIRROR. DIRT AFFECTS BLUE LIGHT FIRST.

Dec 27, 2009 | Televison & Video

2 Answers

The radio display light is too bright - can it be dimmed?


I searched and searched but I could not find anything about adjusting the light on the radio using any of the controls on the radio.

I have an idea though. Why not try placing a cut out piece of window tint over it? It's available in all sorts of darkness. Just play around with it until you find the right darkness or try overlapping 2 or 3 pieces. (Tail light repair tape also comes to mind if you don't mind a red glow, might even look cooler that way. hehe)


Another idea is to try using a piece of tinted plastic that they use to cover headlights.

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The display can be blacked out on the 9857r. To toggle between display on and display off hold the function button until it beeps.

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TRY........with radio on and set on "AM", hold "Clock" button about 7 seconds and let up - bringing a setup menu. Using tuning knob,scroll to "Hardware". Press tuning knob in, bringing up contrast menu. Press tuning knob in, bringing up "contrast level". Turn tuning knob counter-clockwise to "00". Brightness, dimming level should be "170". Turn radio off to exit, then adjust "Dim" button to your liking.

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1 Answer

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i had the same problem and realized i didnt have my bluetooth in discovery mode. if thats the case just press and hold the "call" button until the light stays on.

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Setting the clock


Wiring harness colors have been fairly standardized for many years. The blue/white lead is the "Amplifier turn-on lead", and can be connected to the remote turn-on lead of an external amplifier. To set the clock, press and hold BAND and DISP to display the clock. Press and hold BAND and DISP until the display flashes. SEARCH left to adjust the hours; right to adjust the minutes. Press BAND to set.

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