Question about Magnum 257 CB Radio

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My magnum 257 was bought second hand on eBay it works fine on all modes but has no modulation it does tx and rx fine on both 10 meter band and on the " open" bands **** no voice and I have replaced the mike with a original mike from blue berry sales **** still no luck.

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Http://www.cbtricks.com/radios/rflimited/magnum_257/index.htm
Ok that above site has everything to do with your unit, there is a service and repair manual, and lots of information and links, hope they help.

Posted on May 06, 2010

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My 257hp just starting having the same problem. the magnums seem to have poor solders on the connections i allready had to resolder the connections on the volume controll. I turned the radio upside down to start working on it and to my suprise it worked perfectly upside down turned back right side up and the problem was back. difinately a loose connection just don't know where yet. what the hell worth a try flip it over. I will let know when i find the cap diode or whatever is the loose problem.

Posted on Sep 27, 2011

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1 Answer

Usb audio


need to put it on an oscillascope and frequency counter and have it aligned. even taking to a shop should be less than $45 to have it fully done.

Mar 21, 2014 | Magnum Radio Communications

1 Answer

I have a yellow face magnum 257 I want to mod it for thge 11 meter band also can any one help?


Hi timothy, my name is John. Welcome to FixYa. Are you willing to do this your-self?

Dec 21, 2010 | Magnum 257 CB Radio

1 Answer

Will the 257 work on 11 meters/cb40 channels?


The Magnum 257 is a 10-meter Amateur radio, but it can be easily modified to operate on the 11-meter CB radio band. The modification and use of this radio on the CB frequencies is, of course, illegal. To modify one of the newer blue-faced models (this will not work on the original yellow-face models), remove the speaker side cover and look for the CPU board in the front of the radio close to the mic connector. This board has four sets of pins and a jumper that fits on the pins. To convert/expand the radio, move the connector to the CON3 position. This will give you frequency coverage from 25.165 to 29.699 MHZ, and the CB frequencies will be on Band E of the radio. Again, this modification, and use of the radio on the CB frequencies, is illegal. This modification information is provided for shop/calibration and experimental use only.

Nov 01, 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

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

5 Answers

Magnum 257 No Audio Being Transmitted


Hello.I have a similar situation on a Magnum 257 HP operating on SSB (AM and FM works fine). If i Transmit it works fine, but when i release the Mic button (after TX), in the bottom side were the RX level should be, it appear somth like a signal level 3 to 5 (constant and continous), but i can't get any reception at all. Only if i turn the TX power level to MAXand i transmit, then it goes back to reception, but not every time. Somtime after TX i need to push the mic button 2-3 times to make it recive somthing, but this wors only if the power level is over 60-70% an i repeat, only on SSB.Can i get some help with this issue?

May 10, 2008 | Magnum 257 CB Radio

2 Answers

10 meter portable


There is no factory made 10 meter CB Radio made for US use. CB Radios use 11 meters, and the FCC doesn't allow the combination of 10 and 11 meter radios combines. Although, many people modify 10 meter radios to work on the 11 meter ( CB ) band, it's not legal. Good Luck
Ed
NC Electronic
Mills, Wyoming

Dec 15, 2007 | Magnum 257 CB Radio

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