Question about Magnum 257 CB Radio

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Magnum 257 it will not transmit on lsb or usb it will on am and f

Magnum 257 radio it transmits on am and fm but it will not transmit on lsb or usb transmit bars do not show up on the display on the radio. please help me.

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  • fredp757 Jan 13, 2009

    Hello,
    Same problem here, repair man said he couldn't fix it, instable circuitry, AM/FM is fine, but BLU, unless you blow in the mic doesn't output any power...
    Will get it back, but it's almost useless without the SSB now...


  • fredp757 May 11, 2010

    Hi All,

    Don't know how Wecur4 managed it since, on my side, I had some feedback from Magnum Europe in Holland. The symptom we experience is due to the fact that the mic pin6 that has voltage has been grounded, and some component consequently burned, I passed it over to the repair man, but no news so far, will keep the post updated.
    BR,
    Fred.


  • Anonymous Mar 23, 2014

    Bad static and squealing on transmit

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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

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Been a long time since my first post, but it's been moving all over the place.
First to the French Magnum certified repairman, confirmed the instability issue, not able to fix it. Then I had to send it to Holland to Avera, which is the European rep. for Magnum. Unable to repair too, so they're proposed me an exchange... a long way to get a working set.
Now new worry, audio peps not always there, depending upon temp. (radio's in the car), the mic either works correctly, or it 's difficult to get some power out of it ...thinking about trying another mike, will update the post once done,
73 to all
Fred 14 FAT 138

Posted on Apr 09, 2010

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YOu need to check the finals on the sidebad side. Sounds like they are probably bad.
I hope this has helped.
Ed Meshechek ( Radio Man )
NC Electronics
PO Box 1696
414 6th St
Mills, Wyoming
82644
307-266-4675
wyoed1@aol.com

Posted on Dec 03, 2008

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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?

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1 Answer

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

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