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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Newbie here. U was trying to tune my trc 447 swr but am having more than 3 to 1 regardless. I have checked the antenna system and its fine. Can anybody help me. Thanks

What kind of antenna do you have ? If it a fiberglass whip you may or may not have a tuning rod that may be in the tip of the antenna. If you have a metal antenna then you should be able to adjust it . First,get an external SWR meter and attach it to your radio with a 12" section of jumper coax from the radio to the transmitter side of the meter then your antenna coax goes to the other connector. Now loosen the tuning rod using the alan wrench and set screws on the antenna. Next , place the whip or rod to the bottom and bring it 1/4 " then key you radio and check your swr on channel 1/40/and 19. Write down the numbers you get and then readjust and recheck it. Always writing down the results until you are at least a 1.5:1.

Jan 23, 2016 | Radio Communications

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Can you help need the wiring for astatic silver eagle mic to wire up to the yeasu ft-757-gx radio

The best info I can find iis
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Jan 30, 2015 | Astatic Radio Communications

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Have a general lee,use to work,real good an would get out there,been having nutta it here 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.

Sep 29, 2014 | Radio Communications

1 Answer

I have had a Cobre 29 LTD Classic, a 29 NW LTD Classic and now a 29 LTD Chrome.It seems that the first two died because of possible bad antenna connections. I was able to calibrate the radios and adjust...

I see two possible problems. First, with a magnetic antenna it is difficult to get the proper ground for the antenna. Make sure the magnetic base is clean as well as where you place it. Second, try running your power lead DIRECTLY to the battery and not using the cigarette lighter. Hope it helps.

Feb 27, 2013 | Cobra 29 LTD CB Radio

1 Answer

When i que my mic the display light shows no antenna light unless im touching the antenna i tried this on 2 different trucks

The mounting and adjusting of the antenna is crucial,if it is a magnet mount,the surface must be clean,dry and best to not have any rust,also bottom of the magnet needs to be clean and mount it to the largest area of metal on the vehicle...the trunk lid,middle of your roof are the best.Permanent mounts need to be touching bare metal at the mounting hole not paint,again either mount requires SWR adjustments to match the radio it's attached to,it may require trimming of the metal"whip" if it needs to be lowered for the best reading,also don't rule out the radio chassis might need to be grounded as well.For general safety I would not recommend touching an antenna while it is transmitting any radio signal...if all above is good,you transmit and receive fine,more likely light is faulty or needs it's sensitivity adjusted...Good luck,hope this info helps.

Sep 03, 2011 | Cobra 29 LTD CB Radio

2 Answers

I have 29ltd love the radio i'm over the road truck. I reasonnly replace my old steel whip center load antenna put 4' k40 top load one.ran new coax 18' grey. I get the red ( ant) light comes on...

Check SWR with a meter, if its 1.1 to 1.5 then its fine no matter what the light says. The light can be adjusted inside to not light up until its very high(Its adjustable with a Variable knob inside) Get a Cb shop to check it out. I'd go for LIL Wilson 500 or 1000 antennas, I hear they are superb.

May 11, 2011 | Cobra 29 LTD CB Radio

1 Answer

How do u adjust the frequency readout on a dx55v?

This radio has three modes, USB, LSB and AM. Each one has a voltage adjustment to center the frequency and they look like metal cans. You do need a analyzer to make this adjustment or at the very least a known frequency standard. Temperature can affect this display.

Feb 11, 2010 | Galaxy Radios DX-55V Base CB Radio

1 Answer

Magnum 257 6 digit display

To tune frequencies in either 10 kHz or 100 kHz increments,
press the STEP button until the desired digit is
flashing. Rotate the FREQUENCY control in either direction.
The entire frequency range of the Magnum 257
can be stepped through in 10 or 100 kHz increments.
To tune in 1 kHz increments, press the STEP button
until the 1 kHz digit flashes on and off. Rotate the FREQUENCY
control. NOTE: When stepping in 1 kHz increments,
you are limited to tuning within a 10 kHz
frequency range.

Dec 22, 2008 | Magnum 257 CB Radio

1 Answer

Cb radios-galaxy dx99v

This has an LED channel display, which is the same as the Cobra 29. You can pick up a new one, there are a few color options available. You need to be very proficient with de-soldering and soldering small parts. You need a desoldering iron or desoldering wic, and no bigger than a 30 watt sodlering iron, any bigger can burn the foil trace, and some solder. You have to open the case, remove the faceplate screws, remove the faceplate, remove the channel selector/pcboard, and the channel display pc board together. Now you desolder the pins of the display, aproximately 20, remove the diplay, insert the new display observing direction (make sure it is face with the decimal to the right place), solder each pin to the pc board, and clip off the excess section of the pins (which is sticking out of the back of the channel display pc board. If you have changed to a blue display, you need to remove the orange or green cover, and replace it with a blue one (I make mine from blue transparant report covers) and hot glue it to the inside of the faceplate where the old one would have been. The reason for this is that the blue light will not shing blue thourgh a green or orange cover, and if you use clear, the display will be extremely bright, and the blue cover will knock down the glare a little. Now just put the radio back together and fire it up.

Now with that said, if you think you may have any trouble with this, you can take it to any cb shop and they should be able to help you.

Any more questions, don't hesitate to email me at

Dean Pitts
Rollin CBs

Aug 22, 2008 | Radio Communications

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