Question about Connex 4400 320-Channels Base CB Radio

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Connex 4300 With talkback turned on when I key the mike i get a squeal from the radio

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  • Anonymous Mar 16, 2014

    Before this began to happen it seemed to work fine, but pretty quickly it started, used the talkback to prove not a tone (squeal or such).

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Turn the talk-back OFF. You've got yourself a little feed-back loop happening whilst the talk-back is on.

Most squeling is caused by either AUDIO feedback or RF-induced feedback by running too much power, improperly grounded equipment and/or a high vSWR.

Posted on Mar 24, 2009

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Sure 577b microphone
propably your best way of upgrading any system and decrease the squilling issue that you have but expensive worth every penny $130 to $165 depending on where you get it the ultimate
mic for mobile purpose I own one its something i'll tell you I all the other top mics road king 56 heavy duty, 636L astatic good mics but for those squilling issues you have if you don't want to get the top dog mic than I recommend the astatic since its not quiet as loud as the road king 56 ,
sure 577 its heaven intellengent audio not loud balance best true cancelling system as long as used as recommended your lips have to touch the grill of the mic enough of that I hope that was of any help to you

Posted on Jun 06, 2008

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Buy an noise-cancelling mic. Worked with my General Lee. the other suggestions work well also but the noise-cancelling mic will also improve audio quality. a big loud radio isn't worth 2 cents if nobody can understand you, and the stock mic just doesn't cut it.

Posted on May 10, 2008

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Check for proper shielding,ground, turn mic gain down, move mike farther away from radio, turn off other accessories nearby-ie.-am/fm radio

Posted on Apr 02, 2008

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Posted on Jan 02, 2017

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turn the talkback knob to the right and push it in to engage talkback.when you get the volume you want leave it alone .Now key the mic.You will probably hear a squeal coming from the speaker.Now turn the volume down on the talkback knob until the squeal goes away.If you run your RF gain wide open it may squeal also.

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Connex 4600HP, recently added a bed cover to my truck and had to move my antenna, now that I moved it, I am getting a squeal on my cb when I key the mike, especially with the talkback on, which I have left...


The only thing that comes to mind is to make sure the antenna is well grounded and to make sure that where it's been re routed that there are no power wires next or close to the antenna wire which can cause interference which will be more noticeable once you turn on the truck.

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Radio worked fine when bought 2 days worth went to key up mike only sound is a sustained whistle sound,took to repair shop had fixed guy said he rebuilt talkback worked again 2 days same result sustained...


Do it have a relay mod for the talkback if so take that thing out. use the normal talkback. We are in TX.. no charge to check out.. I would check to make sure it has just plain normal talkback, and no other mods done first.. any other mods done??

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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.

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My radio recieves ok but only whistles when i key the mike is this a major fix?


Do you have talkback installed? It my be too loud and causing feed back. Back the mic gain down if so.

Could also be improper mic wiring. If you use a mic that is wired for a different radio, it could just cause a hum, buzz or squeal.

Another thing that can cause a hum, buzz or squeal is a faulty volume and or squelch knob depending on the radio.

  • Turn down or disable talk back.
  • If you cannot turn off or disable talk back, lower mic gain.
  • Try a different mic that you know is wired for cobra.
  • Play with volume and squelch knobs while TX and see if it stops at all. If it does replace knob.

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I have a dx98vhp and it sqeels* when i key up when the talkback is on. I've tried adjusting the power and i can't figure it out. Thanks


the talkback is too loud. there is no way to adjust the talkback volume on this radio. Talkback is really just so you can check how your audio sounds and your echo. Once it set, there is really no need to have it on.

Turning down the gain on your mic will stop the squeal.

the squeal is cause by feed back from audio from the talk back being heard from the mic.

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Disable talkback


one turn off echo and talkback will turn off. or disconnect the wire goin to the transistor off the echo board that turns on the talkback.

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