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How to Peak and Tune a CB Radio: 6 Steps for Beginners?

Writen by Edwin Jones

Fact checked by Andrew Wright

how to peak and tune a cb radio

You need to set up a CB radio but don’t want to spend so much money on the fee? Stay with us to learn 6 DIY steps on how to peak and tune a CB radio.

Each time you purchase a CB radio, the shop will recommend an additional CB peak and tune step which usually costs from 35 dollars. At that time, you may wonder, “Can I do it myself?”. Honestly speaking, you’re not alone.

The answer to your question is yes. With 6 tools and 6 steps introduced in this article, you can set up a CB radio from scratch. But first, let’s figure out the basics to know why you need a peaked and tuned CB radio.

What is a CB Radio


CB radio, fully named Citizens band radio, is a personal radio service that allows two-way communication between short distances. It is widely used for exchanging information between drivers and in casual conversations, as well.

Why Do I Need to Peak and Tune CB Radios

Typically, manufacturers set their CB radio’s output wattage and modulation a bit lower than legal limits. Why? Because in most cases, there will be differences in power levels between finished products. Then, if a device is more powerful than average, it still meets FCC regulations.

In a nutshell, the original device’s performance hasn’t been optimized yet. Hence, it makes sense to have a CB radio peak and tune appropriately. This process helps you enhance the radio’s operation without damaging the radio or breaking the operation regulations.

How to Peak and Tune a CB Radio: A Complete Guide


Things You Need To Follow This Tutorial

Now you know the importance of this process. Let’s figure out supplies you need to peak and tune a CB radio.

  • The CB radio with a microphone.
  • Batteries: To power the radio.
  • An antenna: To get the signal.
  • An SWR meter: To measure the signal output.
  • Coaxial cables: To connect devices above.
  • A screwdriver: To peak the CB radio by yourself.

Step By Step Instructions

1. Read the manual

If you haven’t got much experience peaking and tuning a CB radio, the manual will be a good place to start. There you will figure out its specifications, requirements, and what to notice when optimizing the radio.

2. Set up the SWR meter

To hook up the SWR meter, you need to connect it with the antenna and the CB radio by coaxial cables.

This step makes the SWR meter be an adaptor between the antenna and the radio. Then, the number given by the SWR shows if the radio is peaked and tuned correctly.

3. Set up the antenna

The next step is to place the antenna to get signals for your CB radio. Remember that the position of the antenna matters a lot. To maximize the range, you’d better mount them at the highest point of your vehicles.

4. Adjust the antenna as needed

Now you will check your CB radio’s signals on channel 1 and channel 40. The principle here is to adjust the antenna until the SWR readings between the two channels are similar. Follow the steps below:

  • Set your radio on channel 1 and turn the SWR to the FWD mode.
  • Press the talking button on the microphone, and hold on till the end of this process.
  • Adjust the SWR’S calibration dial until the needle is right on the SET location. Then, you flip the meter to the REF mode and read the needle number.
  • Repeat the same process with channel 40 and compare the two readings. If they are close, it’s good. If channel 1’s number is higher, the antenna is too short. On the flipped side, the antenna is too long.
  • Shorten or lengthen the antenna until the readings of the two channels are the same or at least similar.


  • The lower the SWR’s number, the more efficient operations your radio is. The ideal number is below 2.0
  • A slight adjustment of the antenna can affect the SWR’s reading a lot. Typically, you will take a couple of millimeters only when adjusting it.
  • Watch this video if you need visual instruction.

Pro tips: If you don’t have an SWR meter on hand, you can still tune your radio with the help of a partner and another CB. Check out the instruction here (internal link)

Still, we highly recommend choosing the SWR way for more accuracy and convenience. Moreover, since a radio needs to be tuned from time to time, investing from 20$ in an SWR meter would give you more benefit in the long run.

5. Optimizing the modulation

To optimize the modulation, you will adjust its knob on the CB radio. You start by turning clockwise or backward depending on the specific radio. Then, check the modulation level through the meter and ensure that the voice has no distortion or spurious emission.

Note that overmodulation may damage your CB radio and affect your transmission. The ideal range for modulation is from 85% to under 100%.

6. Peak the CB radio

To peak a CB radio here means increasing its transmit power from the inside. Note that you only need to do this if your radio is an old model; Otherwise, you can pass this step.

Since it is a technical and complicated process, we will have two choices for you:

  • Go to a CB radio shop to get help from specialists.
  • Do it yourself if you have a strong experience already. You’d need an insulated screwdriver to deal with the materials inside.

Here we recommend you choose the first way to protect your radio from many risks, such as being overmodulated or damaged. However, if you still want to do it, consider watching this tutorial video for detailed guidance on tuning CB radios.

Bonus Tips For A Better Experience

Now your radio is ready for use. Here are some more tips for the best service.

Check if the radio works well

After finishing all the processes, you can talk to a partner on the same channel to test your radio transmission. Don’t forget to switch between channels to ensure that it works with stability.

Learn the CB lingo and radio codes

As you may already know, CB radio has many terminologies created for concise and efficient communication. For instance, saying “I’m 10” means “I’m done talking, transmission completed.” or saying “10-1” is “I can’t hear you well.”

Meanwhile, the legal limit for a talk through CB is 5 minutes. Your partners won’t have much time to explain those slang words to you.

That’s why it makes sense to learn them or at least know the most popular ones. By understanding the CB lingo and radio codes, you can communicate professionally, avoid misunderstanding, and convey more within a limited time.


Yes, we’ve gone through 6 steps on how to peak and tune a CB radio for beginners with proper resources. The last tip is to follow the manual as well as our instructions carefully to get the best enhancement; Otherwise, wasting your time and risking your radio.

Don’t hesitate to leave us a comment below for further discussion and share the post if you see it worth recommending to others. We hope to provide the best guidance for your needs. Best of luck!

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