Question about Magnum S9 Base CB Radio

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Electrical feedback when on off switch is just turned on ie no volume i can hear a buzzing sound from the seaker and if i turn the dimmer switch to low it gets louder some sort of electrical feedback from radio

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  • Anonymous Oct 20, 2008

    i have same get in touch with knights they will tell you how to fix

  • ot4848 Jan 19, 2009

    i have the same problem, PLUS the SSB is wrong, upper is even with am freq, lsb is +5 kc over am freq. ie 27.205 becomes 27.2055 on lsb,27.2050 on usb.

    Is it a power problem or bad SSB circuit?

  • Dean Dishman May 11, 2010

    What are you using for a power supply? That could be your problem Hook it directly to the battery and it should clear it up but ground it good


1 Answer

Phone knights 01652 648 378,its a common fault

Posted on Oct 20, 2008

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Why don't I have sound on uniden pc78ltw?

the knob that turns the radio on and off is the volume potentiaometer.turn it 1/2 wayopen.the next knob is the squelch maqke sure it is all the to the left.the next knob is the mic gain and the RF gain.Set the mic gain at 1/2 and the RF gain all the to the right.the next knob is the delta tune,set it 1/2 way the next knob is the calibration knob leave it alone.Now above those knobs are little switches .the third switch from the left is for CB/PA make sure its on CB. check the WX switch and make sure it not on a weather station. and finally the last switch to the right is called a dynamic squelch switch.Make sure it is down. with all said your radio should be on and you should be able to hear sound. If not ,take an external speaker and hook it to the external speaker plug in the back of the radio.If you hear something then you internal speaker is junk.replace it .

Sep 04, 2014 | Radio Communications

1 Answer

Receiving volume is very low, I have to turn the volume up all the way to hear anything (squelch is very low when I turned knob to readjust settings) when before I didn't even need to turn it up halfway to...

was the radio wired direct or with a cigarette lighter plug? try the RF gain knob and the mic gain knob.If they are wide open does the radio rec.any better? if not you may have a problem with the main IC

Jan 04, 2014 | Cobra 29 LTD CB Radio

1 Answer

Midland Model 77-099 CB Transceiver Stuck on Channel 8, No feedback noise from speaker.

undo the mic from the connector and blow into the connector to clear out any dust then do the same with the radio end. no luck then get a multimeter and put the black end into the antenna connector center and with the red end touch all pins seperatly to check for any kind of reading to confirm its not the the mic and do the same with the wires in it.unless you have knowledge of electronics you shaould not go any furtherthan this.take it to a tech and let him check out the leds that control the switching.

Feb 02, 2013 | Midland 77-099 CB Radio

1 Answer

Turned up full volume u can only just hear sound if ear right to it was working fine then the volume just ******** out

It could be the mic plug. uniden is known for the issue where the wires inside the mix plug break at the solder joints.

When the RX wire breaks, you will loose receive because the radio will not go into receive mode. But you can usually hear it ever so slightly if you crank the volume.

Other issue that may cause this. No radio activity, (unless you hear radio activity low and not static)

poor feed line or antenna.

I would try a different mic that is known to work.

Aug 11, 2012 | Radio Communications

2 Answers

I have a Connex 4600 Turbo mounted in the headliner of a W900L Kenworth using Wilson 2000 twin antennas and a RK56 mic. When trying to use the "talk-back" feature all I hear is constant...

Strange. You shouldn't have a squealing problem with an RK56 noise canceling mic.

Unfortunately there is no way to change the volume of the talkback. Its too loud. The only solution is to turn the mic gain down.

The only reason you need to have talkback on is to check your audio. Make sure the echo is good and what not. After that you really don't need it on. So turn down the mic gain, then check the echo, then turn off the Talkback and turn the gain back up.

The squeal is feedback from the talkback being to loud and being heard by the mic. So the only way to solve it is to lower the volume of the talkback, (Which is not possible in this radio) lowering the mic gain(which lowers your audio level) or turning it off.

Nov 08, 2010 | Connex 4600 Base CB Radio

1 Answer

I cannot hear anything from my cobra cb anymore, just makes a humming sound. not too familiar with the settings either

Turn the radio on, turn the squelch knob all the way to the left,turn volume up, flip the switch to cb,not to pa,turn rf gain to the left,flip switch to normal,turn channel to 19,make sure the antenna is connected and mike is plugged in,can you hear any talking? If not let me know for further information. hope this was very helpful..

Apr 01, 2010 | Cobra 29 LTD CB Radio

1 Answer

Cobra 2000

Unplug it,and remove the cover. Hook it back up and turn it on. Take a pencil with the eraser end and gently press around where the volume is soldered in the circuit.Wiggle the volume knob,listen if volume change. Sounds like a cold solder joint.Re- solder the joints to volume,or could be a dirty control, if still no volume, turn off and spray inside of volume tuner with contact cleaner. hope this helps..

Mar 30, 2010 | Cobra 148 GTL 120-Channels Base CB Radio

2 Answers

How do I set the clock on my Ranger professional with Blue Tooth

Press dimmer switch 3 sec, then when first two digits (hour( of clock flashes set hour using Phone Volume switches. Press dimmer again to set minutes, then when done press Dimmer once more to activate the clock. It displays in military configuration (e.g., 1:30 PM will read as 1330 Hrs) See user manual page 8

Jul 14, 2009 | Ranger TR-966 CB Radio

2 Answers



Offhand, pls try:
  • If the high pitch sound (feedback) occurs during the receive, then you need to check the switch inside the microphone and verify that the audio line is not directly connected mic element wire; it should pass through the switch. Alternately, it may be the switch that is shorted. If you are using a power mic, you may have to lower the settings a bit or decrease the gain;
  • If the feedback occurs during transmit, you need to check the TX/RX regulator and switching circuitry. In some cases this would also be true if you are using a linear amp and the grounding is not adequate and/or the SWR relatively high.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

Jul 31, 2008 | Cobra 148 GTL 120-Channels Base CB Radio

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