Normally you won't start to see a reduction in your transmit audio level (aka modulation) as long as your Mic Gain is at the 12:00 position or higher. Just make sure to keep your Mic Gain as high as you can get it. Turn down your Mic Gain until the talkback stops squealing. If you don't have a way to turn down the talkback level, your microphone gain will produce the same effect. To reduce your transmit squealing, the first step is to turn down the talkback level if your setup has a dedicated control for it. This is where your microphone gain can come in to help. A feedback loop is created and you will hear transmit feedback, or a squealing sound. With talkback enabled, your speaker echos what you say, if your microphone is too close to your speaker, it picks up your echo, then your echo comes through the speaker, and it's again picked up through your mic. You can have a similar problem with any CB system that has built-in talkback. Everyone has heard what happens when someone at a concert gets metal too close to a microphone, and a loud high pitched sound is produced. Talkback is a special function found in some CB's and some external speakers, it is a circuit that allows you to monitor what you sound like to other people, by hearing your own voice through your CB's internal or external speaker. Talkback and reasons you may have transmit squeal But for most people the above 3 microphone categories will comprise what you are using. There are some variations on the above, like echo mics, or electret element mics. Since these mics are somewhat less loud, your Mic Gain will almost always need to be turned far the right, all the way up, for that clear and loud audio. These types of microphones are not as loud as the stock mics, or amplified mics, but they are almost always the clearest and cut out all the background noise. Noise Canceling Mics: The most common CB microphone, the one we suggest for most mobile installations, is a noise canceling mic like the Astatic 636L or the RoadKing RK56.If you're going to use an amplified mic, you will need to spend some time getting both the gain on the microphone itself, and the Mic Gain on your CB set properly where you are loud, but clear. If the Mic Gain on your radio is turned all the way up, and the amplified microphone is up too high, you will sound like a distorted, squealing, hard to understand mess to everyone else. Amplified / Power Mics: Amplified mics like the Astatic D104M6B require a battery, this battery powers the microphone element and makes your voice even louder.So with any dynamic mic, or any mic that comes with your radio, you may need to back your Mic Gain down to sound clear. Dynamic / Stock Mics: Most CB's come with a dynamic microphone -which is essentially a speaker, in reverse- the issue is that these types of mics are so loud that you may sound over-modulated, or distorted if your run your Mic Gain turned all the way up (to the right).So why would you want to turn it down? The answer is usually related to which type of microphone you are using. You now understand that your Mic Gain controls how loud your voice is. Here's where this control can get tricky. Why your microphone affects your Mic Gain In reality the Mic Gain allows you to turn down your voice, rather than turning it up.

The name of this control makes it sound like you're boosting something beyond what it would normally be set at, sort of like turning turning your volume to 11 (thanks Spinal Tap!). One of the reasons the Mic Gain control is not well understood by casual CB'ers has to do with the name, 'Mic Gain'. And voila, with the twist of a control, now everyone can hear them talking again. After inspecting their radio, I find their Mic Gain is turned down. I have had many, many people bring their radio in to have it repaired because they 'can't get out'. Having worked in the communications business for almost 2 decades, I can tell you the Mic Gain control along with the RF gain control are the most common to be positioned incorrectly. Keep reading to better understand this control. However, there are reasons to not always to do this. If you want to know where to put this control, normally, turn it all the way up (to the right). Or a much easier explanation: the Mic Gain controls how loud you are to everyone else. Your Mic Gain control, which is short for 'microphone gain' is in essence, a level control for your modulated audio. So what does the Mic Gain or Dynamike control do?

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