Question about Magnum 257 CB Radio

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Magnum s-980 freq. counter is turnd of when noise blankers are on full.

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  • road69 Oct 20, 2008

    I am awaire ove this but whould like to chang it....

  • road69 Oct 20, 2008

    fixed the problem... clip the small brown wire on th right side of the blanker swich . the counter will stay on now.........

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All the s9 do this its not a fault

Posted on Oct 20, 2008


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Freq. display not correct but radio is on the write freq.


This of no surprise because it is just that a display not a counter.


There must be an alignment pot for the meter display although there will be some doubt if you just align it with out using a frequency counter.

http://cbtricks.com/radios/rflimited/index.htm

you might find more alignment info under the S45 omegaforce as they have similar boards.

hope this helps...goodluck!!!!

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The freq counter stays lit at 10.625mnz the claifier knob or the channel selecter will not change the freq counter


This problem, really need to be on a bench to test.. FREE at any good cb shop, to tell you what is wrong.... But most times when a freq counter is not working. Either the crystal is bad, poorly soldered, or its not receiving an input signal. Best way to test is to have a second freq counter external inline using coax.. and check the output of the radio and see if it shows correct or wrong. If it is showing correct they you internal freq counter is messed up. and needs to be check for a bad crystal or solder joints. sometimes even the voltage regulators go bad.. If it is showing a wrong freq on external counter then check the radio's crystal and oscillator circuit. this too can be as simple as a cold solder joint. on the solder side check the small surface mount diode near the PLL, next to the PLL shielded covers. It is normally black these come loose often times too. If you need more help feel free to call or text for more help.

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Hi my deltaforce is slightly off on ssb you have to be on 27554 and clarifier at 12 30 to be spot on 27555 thanks vince


Use a known good external freq counter, and do the tx alignment. that will put your meter back on showing the right freq when you are..

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1 Answer

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NB-Noise blanker this helps elemenate noise in the receive.ANL-Automatic noise limiter wich does about the same thing as the Noise blanker.

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U mean on sideband? Frequency counter only useful on other than sideband operation. This does not mean the carrier insertion osc. is on frequency. If it needs adjustment, your voice will sound high/ low on transmit. Incoming signals will sound right after adjusting the osc.

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If you're receiving OK on AM & SSB, the likely adjustment would be the FM discriminator coil L5. You can adjust it for maximum noise with no signal applied.

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1 Answer

Magnum 257 off freq


Colin, here is all the tech info on alignments that your looking for,,,go here;
http://www.cbtricks.com/radios/rflimited/magnum_257/index.htm

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

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1 Answer

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Herman, one thing that should help is turn on the NB and also TONE .

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