Question about Magnum 257 CB Radio

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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

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

Posted on Sep 12, 2010


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Have a 357 smith & wesson ctg highway patrolman model28-2 ser n 289674 any info please? thank you

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  • Jan 01, 2016 | Sport & Outdoor - Others

    1 Answer

    Have a Magnum 257HP 10 meter radio. While connected to a 50 ohm dummy load, and a power meter, noticed that the USB and LSB would not modulate when a voice input is placed into the microphone. Also, on...

    You may have a radio where the AM limiter has been defeated which can cause all kinds of issues. I would first check the mic is wired right and does not have a problem, the radio should have output with a tone to it on sideband--wattage up to over 20 watts on SSB is normal.

    Dec 12, 2012 | Magnum Radio Communications

    1 Answer

    First My sister inlaw has a 3/4 recirc line. used the by pass h&c under last faucet to use cold as recircu line. Note acutal 3/4recirc is in kitchen but even thou closer to water htr. it is last for...

    I don't understand everything being asked, so add a comment any time.

    Problem1 is excessive electric bill.
    Suspect is new 120Volt Taco recirculation pump.
    Look at motor nameplate for amps and watts and HP. Taco pump is usually robust 1/3 HP which is 252 watts or same as running four 60 watt light bulbs.
    If pump runs 18 hours per day x 252 watts = 4536 watts or 4.5 Kilowatts per day
    Buy a kill-o-watt meter that plugs into outlet, and plug Taco pump into the meter for 48 hours.
    This will give you total watts used for that time period.
    1000 watts = 1 kilowatt.
    Electric bill is probably 12 to 20 cents per kilowatt.
    So if Taco uses 4.5 kilowatts per day, that is $.54 to $.90 per day multiplied by 30 days.
    So cost is $15 to $30 per month.

    Problem2 is Taco runs too long.
    Taco operates either by thermostat or by timer. You choose which mode by using slide switch that is usually located under the timer dial. Set switch to TIMER to use timer, and ON to use thermostat, and off to turn TACO off.
    If Taco is set for thermostatic operation, the Taco might be defective. Or there could be crossover problem at single handled faucet.
    Another problem could be air in the water line: install air vent.

    Jul 17, 2011 | Taco 1/2" 006 BC4-TAC Circulator Pump/...

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    Hi mys9 with 1969 finals transmitts at about 15 watts,non variable on fm 3 watts variable--and peaks at 40 watts on am..ssb is about 5 this a final problem? many thank les

    In answer to your question, no, it is no a problem with the final. I would try turning the ALC control (VR12) until you have 45 Watts out. (Ref Magnum S9 alignment procedure on

    ....Don at NTCB, Inc.

    May 29, 2011 | Magnum S9 Base CB Radio

    1 Answer

    Only doing about 45 watts this is the 80 watt version s- meter not working

    What kind of meter do you have. That may be correct If it's an rms only meter that's all it will show it won't show the peak wattage. You would need a peak reading meter. If you do have a peak meter then check your swr's. If they are high then it will hurt the output of the radio. We. Dont charge to check out any radio.

    May 15, 2011 | Magnum 257 CB Radio

    1 Answer

    Just buying magnum s9 radio can it be used on 11 metre band or has it got to be modified for 26-27 cept channels as i think its just a 10 metre radio please advise many thanks.

    The magnum S9 is factory set for the 10 Meter band but can be "tweaked" to get up into the 11 meter band...
    check out this neat and easy mod:

    Hope this helps!,ben

    Jan 13, 2011 | Magnum S9 Base 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

    3 Answers

    Wat power does this radio push

    Generally All CB Radios will only push 4 watts. This is only if you have a SWR of 1:1

    Jul 11, 2009 | Magnum S9 Base CB Radio

    2 Answers

    Peak and tune a mini magnum 30 10 meter radio

    You need schematics and a good peak reading watt meter. You can do damage if you don't have eqipment/knowledge.

    Mar 16, 2009 | Motorola OEM Compatible 6060937H02 Two-Way...

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    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
    NC Electronic
    Mills, Wyoming

    Dec 15, 2007 | Magnum 257 CB Radio

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