Question about Cobra 148 GTL 120-Channels Base CB Radio

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Mic gain problem

When ever I turn up my mic gain I get a squealing sound.

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Hi again,

Pls see your other post here.

Cheers.

Posted on Jul 31, 2008

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1 Answer

Cobra highgear hg75m mic squeals


get it away from the ext . speaker. They are cheap enough ,buy another one and see if it still squeals. If it does then you may have to jump the mic with resistors ,turn down your mic gain, check for talk back on rear where your pa. and external speaker hooks to inside the radio. If you see a resister connecting them then you have talk back . Mainly its a Keep the mic away from the speaker deal that makes them squeal. Try other cobra mics with the same pin out and see if it still happens . easy fix just have to be patient .

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Cb works but there is no sound


turn volume and mic gain half way up, plug in an external speaker into the PA jack, flip PA switch and key up, if it doesnt squeal your audio final is blown or it could be so simple as mic wired wrong or broken wire. try another mic.

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turn rf gain up and the mic gain down until it stops squealing.

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My radio is a Galaxy DX 98. It squeals when I key up


change "MIC" to a factory,or turn back Mic gain. Mic can short out or may have too much gain(power mics). Use standard dead Mic that was designed for radio. If that does not help,it may be inside radio, wires on MIC connectors need soldered again(make sure they don't touch th eothers.

Apr 23, 2011 | CB Radios

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My radio quells back when my mic gain is turn up more than about quater way


sounds like a faulty "MIC" or bad knob inside radio. Your radio may have too much gain. Try using a ordinary straight "MIC" . Some radios are tuned to operate with a straight mic. If you use a "Power Mic" it may be too much gain and cause a squeal. Impedance of the mic must be matched. If its a 500 ohm use only 500 ohm. If its an 1000 ohm use only 1000 ohm "Mics". A straight factory Cobra mic(Coffin mic) has gave me the best performance I have ever used on a Cb radio. I can talk 50 miles on straight mics.

Apr 21, 2011 | Galaxy Radios DX 77HML Base CB Radio

1 Answer

Meter only goes half way when keyed up and squeals part time even with different mic


Try turning your echo back or off..Sometimes when the echo is turned up to much you will get a squeal.Have you tried turning your mic gain down some?

Mar 31, 2011 | CB Radios

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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.

Nov 08, 2010 | Connex 4600 Base CB Radio

1 Answer

I have a uniden grant and i have wired a galaxy power desk mic with rogger beep when ever i key it up it squeals was wondering is there a way to fix that


yeah your mic gain is way too high. You can either turn off talk back if you can, or turn the gain down. Depending on how loud the talk back is, your audio may suffer. If that is the case, you will not be able to run that mic. Get an RK-56 or a Skythumper mic. They are noise canceling. You will get no squeal with that mic, and it will sound awesome.

If you really want a roger beep, take it to a tech and them install one.

Oct 23, 2010 | Galaxy Radios DX-66V Base CB Radio

1 Answer

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.

Oct 12, 2010 | Cobra 150 GTL DX Base CB Radio

1 Answer

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.

Sep 14, 2010 | Galaxy Radios Microsystems DX98VHP CB...

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