Question about Magnum 257 CB Radio

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Magnum 257 which amps will work with.

Can i use a Cobra xl350 or an xl 450 with this radio?

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You can use any amp with any radio.

they must be setup to do so.

Posted on Apr 03, 2017


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Posted on Jan 02, 2017

  • 204 Answers

SOURCE: operator/instruction manual

ghilger, First off, has your radio been converted to open up all the other channels(including CB)?? That has to be done first, or it's locked in the ham freq's. I think the factory manual is pretty well detailed, but i've been around radios my whole life. The mode button does the changing from am/fm/usb/lsb.Here's from the manual;

MODE: Operating Mode. Press the MODE control to select the operating mode. The operating mode is indicated on the liquid crystal display: am, fm, usb, or lsb.
* See, there is 2 different functions for each button. One set of functions are by just pushing the buttons, the other set of functions are obtained by pushing the function button first. The function button is activated by pushing in on the clarifier knob.
*Here is for saving of freq's;

Memory Save. To save in memory a specific
frequency and operating mode, select the desired mode and rotate the FREQUENCY control to the desired frequency. Press the FUNC button, and then press the M.SAVE button. S will appear on the LCD next to the frequency. While S is displayed, immediately press any of the memory channel buttons (1 - 5). The mode and frequency is now saved into memory. If the S indicator disappears before you press the memory channel button,
the information will not be saved and the process
must be repeated.

M.LOAD: Memory(Recall). To recall, any of the saved memory channels press the M.LOAD
button. L will appear on the LCD for several seconds. While the letter is displayed press the desired memory channel button (1 - 5). The programmed mode and frequency will be displayed.,
If you have any more questions about the radio, repost them here and I'll try to walk you thru them. The radio is a very good ssb rig, especially set up with a power mic. Hope this helps,, Mechanic

Posted on Feb 03, 2008

  • 204 Answers

SOURCE: magnum 257 off freq

Colin, here is all the tech info on alignments that your looking for,,,go here;

Hope this gets you on the right track,, let us know.

Posted on Mar 10, 2008

  • 1 Answer

SOURCE: magnum 257 it will not transmit on lsb or usb it will on am and f

With SSB you have to put audio on the carrier you cant just key the microphone and expect it to output a signal unless you talk into the microphone at the same time this is how SSB works.
So if you talk and the meter starts to move then its ok, if you talk or whistle and nothing moves then the circuit on the SSB side of the unit is faulty.

Posted on Feb 07, 2009

  • 5158 Answers

SOURCE: My Magnum 257 10 Meter radio will not transmit in any mode.

try this page

Posted on Mar 24, 2009

  • 1 Answer

SOURCE: compre un cb magnum 257 pero perdi las

modificasion del magnum 257 para expandir la frecuencia

Posted on Sep 19, 2009

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Tengo un magnum 257 y un micro dm 452 y necesito la combinacion para instalar el micro con el radio

tengo un magnum 257 y necesito la COMBINACION PARA INSTALARLE UN ROAD DEVIL RD104E.

Mar 17, 2014 | Magnum 257 CB Radio

1 Answer


Notice the black mic plug has the numbers it is solder by numbers. Used rosin core silver solder radio shack sells it.
Mic Wiring
1-Shield (ground)
2-Yellow (audio)
3-Red (transmit)
4-White (receive)

1-Shield & Blue
Yellow NC
Turner Roadking 56
1-Shield & Red
Yellow NC
Sadelta the is a BASE mic

Oct 02, 2011 | Magnum 257 CB Radio

1 Answer

How do i get the magnum 257 80 watt to operate on 11 meters it will be used out of the country thanks bill smith

This radio will need to be converted. Do you know anything about that? If not take it to a shop.

Sep 10, 2010 | Magnum 257 CB Radio

1 Answer

The Magnum 80watt 257

go to cb tricks .com

Apr 20, 2010 | Magnum 257 CB Radio

1 Answer

I am wanting to put my rci mic on my magnum 257. everything works accept the up channel button. can anyone help? Thanks Tom

the up down is done differently in the magnum compared to the ranger. it takes a 22k resistor for making it to go up. and ground is down. cb shop temple, tx on yahoo search... do that and should work. its all done off ONE pin not 2 like the ranger

Jul 05, 2009 | Magnum 257 CB Radio

2 Answers

Compre un cb magnum 257 pero perdi las instrucciones y quiero agarrar frecuencia con otros radios pero no se como empesar cual es el primer paso des pues de en cender el radio

mira el magnum force 257 es un radio de 10 metros y modificable a 11 metros , los canales mas usados en 11metros son el canal 9 osea 27065 mghz , o si tienes licencia puedes usarlo en 10 metros 28,000 por ahi para arriba se usa mucho 28315 en usb , en 11metros se usa am mucho, busca en yahoo , el manual de servicio para que te familiarizes con el suerte.

Apr 02, 2009 | Magnum 257 CB Radio

1 Answer

Diesel #8-32 echo power mics

cobra 4 pin is pin1= shield, pin2= mic audio (usually the shield is wrapped around the mic audio wire).pin 3= transmit or push to talk usually red or white whichever isnt wrapped with the shield, and pin4 = receive or speaker complete

5 pin cobra=1-Audio 2- Shield 3-Receive 4-Switching Wire 5-Transmit, you can jump pins 4 and two

Dec 21, 2008 | Magnum 257 CB Radio

1 Answer

Lost buttons/1 and 2FOR 257

Yes, if this is the Magnum 257, then contact the company at 1-877-624-6869
or e-mail them from their site,,

Hope this helps you, let me know,,, Mechanic

Nov 02, 2008 | Magnum 257 CB Radio

1 Answer

Magnum 257 off freq

Colin, here is all the tech info on alignments that your looking for,,,go here;

Hope this gets you on the right track,, let us know.

Mar 09, 2008 | Magnum 257 CB Radio

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