Question about Connex 3300 240-Channels Base CB Radio

2 Answers

Static restricting RF signal while rolling down the road but stops when i apply the brake or when i slow down to stop or when I am sitting still. I drive a truck for a living which is an international, i have tried running a ground wire from frame to antenna, running power strait to batteries still no luck. This static pegs the needle on the meter half way across. I also installed an 1500w antenna oil cooled coils.

Posted by on

2 Answers

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Expert
  • 126 Answers

Are you using the factory coax. A lot of Internationals have a terrible setup from the factory, they run the coax into a junction box and run your cb coax and your fm radio out of it. You could be getting bad rf feedback through from the FM radio. I would next try a regular antenna mounting bracket setup with a good stranded center coax with at least a 95% braided shielding. You have been on the right track, most problems like this is a process of elimination. If this doesn't fix the problem, or you already have this setup, please reply on here or email me at:

I would be more than happy to assist you with your problem.

Dean Pitts
Rollin CBs
Mt. Vernon, TX

Posted on May 22, 2008

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 463 Answers

You're getting RFI coming from the Trucks main control module or one of the auxiliary system's control modules coming into the radio THROUGH through the antenna. This one is going to be tough.

Posted on Mar 24, 2009

1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Need to tune Panasonic Radio GX700

you need a signal gen and tune down the RF strip

you need to center the pll first and its referance
then tune the IF for center

then tune the front end for max min max rf min noise using a reciever and a noise meter

good luck

Oct 26, 2014 | Radio Communications

1 Answer

Where should I have my rf gain selector hi or lo

rf gain is about local coms if you want your cb to RX far away stuff set it too high but local stuff like friends family that are local then you want too set rf gain to low then only local signal can trigger the squelch ... so the radio will ignore the static and only trigger you when needed ? see what i mean rf gain ye a DX guy will set it high or too listen to people like over 50K away
and let then break the squelch...min

Mar 24, 2014 | Connex 3300 240-Channels Base CB Radio

1 Answer

How to fix cobra 1000 gtl Powers up,meters stuck, no rx just static, All lights work, A mic will Key the on the air light,

have you checked the voltages inside the radio?If you have to much or to little it will not work properly.

Jan 19, 2014 | Cobra 2000 Gtl / 1000 Rf Pwr / Signal...

1 Answer

I have a Cobra CB Radio and was wondering if I have it on SRF or SWR or CAL

S/RF/SWR/CAL SWITCH. When in the S/RF position, the meter swings
proportionally to the strength of the received signal. When transmitting,
the meter indicates relative RF output power.
When in the "CAL" position, the SWR meter can be calibrated by adjust-
ing the "SWR CAL" control to the "CAL" mark on the meter face.
When in the "SWR" position, the standing wave ratio is measured.

You will want to operate on S/RF position.

Jul 14, 2011 | Cobra 29 LTD CB Radio

1 Answer

I have to keep my rf=gain turned all the way down or I get terrible feedback. How do fix it?

The RF limits the signal strength you radio receives. After setting the RF to limit excessive signals, then set your squelch up until the noise is gone. There are some areas which have high RF background noise so adjustments are made often while driving around. Use the ANL (automatic noise limiter) and other features also to control the noise.

Feb 19, 2011 | Ranger RCI-6900F-150 CB Radio

1 Answer

When I talk to serveral different people they say they can hear me but there is also a squealing sound. I have checked all the connectors and I am using a ft fiberglass anntena that is hooked to the...

The mic could be no good.

The things that cause squeal are RF feed back, and or talk back that is too loud. If you have talk back, this is what is causing the feed back. If not, then it is most likely RF feedback. There could be something wrong with the coax, or antenna.

A major cause of this is called common mode current. This is when the rf travels back down the out side of the coax making the coax act like an antenna. It also is bad for the radio because it will change the electrical length of the antenna and will potentially raise the SWR and can damage the radio.

To stop common mode,as close the the antenna that you can, take 6 feet of the coax and make a tightly wound and uniform coil out of the coax, and use zip ties or electrical tape to keep it together.

This will stop the RF from traveling back down the outside of the coax, and in turn will stop the RF feed back if it is caused by common mode current.

Of course, it may just be a bad mic.

Sep 26, 2010 | Midland 1001Z 40-Channels Base CB Radio

1 Answer

Cant recieve or output , I bought a new cable and antenna plus a swr meter.

With an antenna connected, volume set to 1/4 from minimum, squelch / RF squelch fully counter-clockwise (or minimum) - do you hear anything from the speaker? If not - plug an earphone / external speaker into the external speaker jack on the rear - any sound? If not, do you see the S/RF meter needle moving (not resting on 0 or 1)? If not - find a channel with activity on as indicated by the S/RF meter first.

Try with another antenna connected if possible, or transmit with another CB radio on the same channel nearby - and try again.

If you aren't able to receive sound (not just static) - or indicated signals on the S/RF meter, the radio *MAY* need to be professionally serviced. Make sure you get an estimate for the work before authorizing - otherwise you may be spending more on a repair than the radio is worth. It is not uncommon to have to pay a diagnostic fee - that most shop will put toward the repair if allowed to do the work.

Good luck!

Sep 07, 2010 | Cobra 29 LTD CB Radio

1 Answer

Good standing wave but not so good reception

Could be a lot of background noise.
Could be no one near you.
Could be RF GAIN down.

standing wave does not effect receive, it only effects transmit. If you are sitting still some where, you could be in a hole. Depending on where you live there could be a lot of background noise, RF interference. For instance Staten Island is known as "Static Island" because of all the RF interference.

Where you are at, it may be a fact of life.

Oct 16, 2009 | Magnum Radio Communications

2 Answers

No modulation lots of signal

It really depends on what he messed with while he was inside the radio. If he accidentally turned down the rf output power, you can use an inline rf meter and then tune L37 and L38 for max rf output.

Rollin CBs

Feb 24, 2008 | Cobra 148 GTL 120-Channels Base CB Radio

2 Answers

Antenna light still on

The antenna warning light on the Cobra 29 LTD has a pot ( varabile resistor ) that sets the senativity of the light coming on. If you open the radio, you'le see the pot at the back of the radio. It's the last pot in the rear of the chassis Simply turn it more torward the center of the setting ( anyplace is ok as it means nothing to the preformance of the radio ). The light won't come on unless the SWR's are high. Good Luck and if I can help more, you can email me at this address or at my email address
NC Electronic
Mills, Wyoming

Oct 31, 2007 | Cobra 29 LTD CB Radio

Not finding what you are looking for?
Connex 3300 240-Channels Base CB Radio Logo

106 people viewed this question

Ask a Question

Usually answered in minutes!

Top Connex Radio Communications Experts

Level 2 Expert

489 Answers


Level 3 Expert

3018 Answers


Level 3 Expert

3287 Answers

Are you a Connex Radio Communication Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides