Question about Cobra 29 LTD CB Radio

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One thing I notice is that when my regular radio is playing on the AM band I get interference through it from my CB when I key the mike. Also, if I touch the CB or mike or mike cord the static I hear through the CB quiets down.

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Your CB is AM as is your other radio. AM stands for Amplitude Modulation. The frequencies from AM are between 530KHz and 1700KHz. The CB can be heard through your AM radio because they operate on the same frequencies. But not so much under normal circumstances. First make sure your CB is grounded well. Take a copper braid strap or a solid 12 gauge copper wire and hook one end onto one of the bracket screws and ground the other end to a pipe or perhaps a hose faucet outside. This will help a lot. Proper grounding is key to removing this interference. You might want to put a ferrite bead on your coax close to the back of your CB too. You can also buy a ferrite bead and rap the cord to your radio around it several time up close to the radio. These things will take care of it. Another thing is if you are running power behind it or maybe your CB is really "peaked and tuned" this will cause interference as well. To much and the FCC will knock on your door and offer you a $10,000 fine you can't refuse. Hope this helps.

Posted on Mar 23, 2011

  • Steve Tompkins
    Steve Tompkins Apr 01, 2011

    I agree with IRONFIST109...Grounding is important in Am installation. Ground the heck out of it. A rod drove 8-10 feet into earth,waterpipes,Metal filing cabinets, Chain linked fence buried in the earth 8 feet underneath your outdoor antenna Say Antron A99, Imax 2000, 5/8 Maco 5000 ground planes. A good ferrite core is inside of old junk Am radios. Just tape it to your coax in the back.



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Related Questions:


Problems in CB Radio Receive and Modulation

Much of the time complaints about CB receive (RX) and modulation are caused by problems in the antenna system. Make sure there are no shorted or open connections in the coaxial cable or PL-259 (screw-on connectors for coaxial cable, located at the antenna and rear of CB radio) connectors. Use your radio's meter or better still, a Power/SWR meter to check the SWR (Standing Wave Ratio) of the antenna. Try to get that as close as possible to a 1:1 ratio on the meter. A shorted or open antenna can keep the receive audio on your radio at very low levels. Plus, this will harm your transmitter if you continue keying the mike.

Another problem can surface in the radio itself. This will be noticed if you can transmit, but have no "modulation". Modulation can be described as the voice heard above the "carrier" (your transmitted signal). Every CBer knows about the term, modulation. The Truckers will definitely inform you about your modulation This problem can be caused by a defective AMC (Automatic Modulation Control) stage in the receiver circuit. Also, there will be no modulation upon transmit.

One other thing could be causing this lack of receive audio. Defective wiring or switching in the microphone can result in no audio. Additionally, in many radios, a missing mike will not allow receive, because the microphone connection completes the RX (Receive) circuit.

1. Check the antenna system, and fix any problems.
2. Check mike, or substitute another one.
3. Using meter, and/or another radio for listening on same channel, check power and receive.
4. You can probably fix 1, 2 and 3 yourself, or with the aid of a friend.
5. AMC problem in radio (as described above) will require professional service from a CB (Citizens Band) repair facility.

The above suggestions and advice will assist in repairing the majority of the symptoms described.

Regards, Bill

on Sep 18, 2010 | Car Audio & Video

1 Answer

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.

Sep 23, 2011 | Connex 4600 Base CB Radio

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My connex 3300 wont transmit anymore and the talk back wont work either,i have tried a different mike and when you key it up the meter still won't swing.

Plug in an external speaker to the pa jack ... Switch the band selector to pa and see if you hear yourself... No? Bad audio chip

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In Thailand Cb radio users must use freq range 245.000 - 249.999 freqs. Do usa Cb's use this freq?

Thailand actually has three "CB" bands, the first is the same as the U.S. / CEPT (EU "European Community) band 26.965 - 27.405 MHz, the second is a 78MHz VHF mid CB band (I think its either 40 or 80 channels with FM mode) and then the 245.0000 - 245.9875 MHz VHF 80 channel band - apparently the law also stipulates that the 78MHz CBs must be yellow colored and the 245MHz CBs must be red colored.

But yeah, 245MHz Thailand VHF CBs are very illegal in the United States.

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How do you set regular channels and low and high on a connex 3300

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1 Answer

Cb radio

Not having the radio in front of me,I would check the following things.

1: Loose wire on the antenna connector inside the radio. (cols solder joint)

2.Turn radio upside down with covers off, look for bad connections on the legs of the buffer, driver, or final. Also check the voltage regulator. It should be mounted on the side of the chassis on the same side the mike connector is. If you don;t see any loose connections I would suspect a bad final, or a bad connection in the antenna sysem.

When you say high band wiorks great, I would lean more on the antenna system. Some antennas do not Broadband well. A good going over on the system from coax to antenna is a good idea. Check for ground, corrision, swr. etc.
The thing that gets me going is when things get warm it works better. Well when things get warm, they expand and possibly a bad connection can fix itself.
The connex radio is a good radio, but a big truck can play hell with the circuit board.

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You may be generating a harmonic from the cb that is picked up by the radio. Check if different channels and if AM/FM act the same. Also if a cd unit, does playing a cd produce the same effect. If all stations and the cd player do the same thing, interference is most likely coming in on the radio power or ground leads. You can get an inline noise filter from radio shack:
or you can make your own if you have an old computer power supply by using the toroids if you can get to the power supply lead. Make sure the radio housing is electrically connected to ground. The interference may also be coming in on the radio antenna. Try moving the cb antenna away from it if possible, or test by rotating the cb antenna to a horizontal position temporarily.

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Lost channels in a galaxy 66v cb radio

as far as the transmit frequency changing while you have the mic keyed this is normal, the transmit frequency is a little different than the receive, as far as the lost channels go you need to check the galaxy website and check to see if thier is any fixes listed. if none is listed then you can send the tech's a e-mail and tell them your problem and they will advise you on what to do.

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