Question about Midland 1001Z 40-Channels Base CB Radio

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Cb is fine when vehicle is off , but when vehicle is running it feeds motor noise back threw my cb?

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There are several things you can do to help limit motor noise interference but first you have to figure out if the noise is coming from the power wire, or the antenna system. Here is how to do that.

  1. Start the car, and turn on the radio.
  2. Trun the squelch off so that you can hear the interference.
  3. Unscrew the antenna coax from the back of the radio.(make sure that you do not key the radio at this point. It is bad to key a radio without an antenna hooked up.)
If the noise goes away when you unplug the coax, the noise is getting in from the antenna system. It's either getting in from bad coax, poorly grounded antenna, or position of antenna. For instance, if its mounted on the back of the truck some times it picks up the fuel pump noise.

If the noise is still there then it is coming in via the power cable. If this is the case then there are a few things you can do.

First. Make sure the radio has a good ground. Next, run the power wire right to the battery. This eliminates most noise. Twisting the power cord helps cancel out some noise. And a knot right at the plug end of the cord also helps. Lastly, if the noise is still bad you can get a power wire ground loop noise canceling unit. This stops most noise.

Posted on Sep 09, 2010


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You are getting engine interference from the electronics in the ignition system. First you need to see where its coming in from, The antenna or the power wire.

Turn on the vehicle, and the radio. Then while you hear the noise interference disconnect the antenna.(Do not key the radio) If the noise disappears when you disconnect the antenna, then the noise is coming in from the antenna. Relocating of the antenna may be necessary and or you have bad coax and it may need replacing. If the noise is still there when you take the antenna wire off, then the noise is coming in through the power wire. (this is most likely.)

There should be a setting called ANL (automatic noise limiter, or DSC. Turn this on. That should get rid of it, or make it not so present. If there is still a lot of engine noise then.........

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If you cannot run the wires to the battery, then you can do the following.

2) Get a ground loop isolator for the power wire. Make sure its not one for the RCA jacks for an audio amplifier. Its made for the power wires. This hooks to where you have the radio connected to now, and then the radio hooks to it.

You can get them from radio shack, but usually they are not in stock and you will have to order it.

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