20 Most Recent Cobra 29 LTD CB Radio - Page 8 Questions & Answers

Check for fuse, inside box, as well as outside under the hood. Check your ground wire, not connected...when your groundwire is not making contact to the body or other metal.. this problem will happen, or your hot wire is not connected to your fusebox...trace your hot wire to see if it is connected, if not connect to fuse box, and this might solve your problem. Hope this help!

is fuse good should be on red wire power or in back of cb itself

Yes, people should. As long as your antenna is connected up and you can hear people, they can hear you.

the same way you set it on any other radio.Look at the face of the set,you will see a switch that says S/RF,CAL , SWR. Now look at your meter and you will see a triangle that shows cal.Put your set on ch 1 with the switch in the cal position and bring the needle to that calibrate line on the meter by keying the mic. now release the key and set switch to SWR and key the mic again.Now write this reading down.Repeat for channels 40 and 19. If the reading is higher on 40 than on 1 you need to shorten the ANTENNA.If its higher on 1 than 40 you need to make your ANTENNA longer Always check 19 to make sure you have an average SWR. Any reading under 1.9:1 is good

I have a wilson 5000 on a 4 mag setup.18ft of coax and a 1 to 2 match on all channels. I also have a 29 lx radio .

Look closely at the jack for the microphone and you can see the small numbers that are on it. On the Roadking red and shield (bare) go to 1. White 2, Blue 3, black 4 and the yellow in the cable does not connect to anything.

You have to press the transmit button to get the radio to send a signal that you can calibrate the SWR meter to. If you are pressing the transmit button and nothing is happening then it could be a blown final transistor, a bad switch, bad microphone connection etc.

make sure you have your radio set on CAL and then adjust the knob that says adjust .Turn it all the to the right then bring it back to the set point on the dial then un key the mic,move the switch to SWR , key the mic and that is your reading. Do this on channels 40 - 1 then 19. Make sure you write down the readings for each channel. The adjust your antenna from there.

In the form of a question???? I am assuming you are hearing it on another radio or someone has told you it is quieter. A shorted coax is more likely wattage and range reduction. Proportionally reducing audio volume.......modulation. If you have only changed antenna it could be broken or could you have put the Teflon washer on the bottom of the mount rather than insulating the antenna from the mount during installation. That would result in a direct ground. Thank for reading my blither.....take care.

plug the external speaker into your PA jack and select the PA switch. If PA works then the audio chip is good. The cobra 29 must have a mic plugged in to get receive audio, You may have a broken wire at the mic connector.

Mack's cophased harness just merges the two wires at the connector going to your radio. If the radio falls out of compartment and is caught by the coax it could damage this connection. Outer shield and inner lead could short here. I have replaced many a final due to bad coax for my company which primarily Mack. Well i say that but it is the beloved company driver that continues to talk on a bad antenna system. It actually take a while to kill a final even with out an antenna attached. Good Luck...........

Check your antenna are you using the correct antenna? What kind of antenna are you using? I recommend a dipole antena,at CB use 1.65 meters per side. with RG 58 -50 Ohms It is a very easy type of antenna and very,very cheap

I see two possible problems. First, with a magnetic antenna it is difficult to get the proper ground for the antenna. Make sure the magnetic base is clean as well as where you place it. Second, try running your power lead DIRECTLY to the battery and not using the cigarette lighter. Hope it helps. Tom

The IRF 520 is a MOSFET and is commonly used in newer radios. The 2SC1969 BiPolar Transistor was use in many older Single Sideband CB's and DX Radios. There are other part numbers that were used but the transistors (Finals) look like this. I hope this helps.

Check D22, TR23 and C119.

Can you tell us more about the problem?

Might have blown the final amp in the transmitter due to high SWR. Unless you have test equipment and soldering abililty, this is best taken in for service.

if a mod has been done to the cobra 29 (all 29,s)the light will come on just find vr6 audio the radio as it comes on adjust vr6 untill it goes away,,,,always trust your watt meter(s.w.r scale)over the flashing light its really easy to do it beats paying a shop $10-$15

First lets see why the channel display is not lighting up. This indicates a problem internally with the radio. Is the CB/PA switch in the CB position? If the CB/PA switch is in the CB position and the display is still not lighting up then you more than likely have a problem with a voltage regulator. If the regulator shorts or opens then the meter lights will come on but the VCO / PLL circuit will be dead thus No receive or transmit.

Cobra 29 LTD doesn't have SSB. You must have a Cobra 146 GTL or one of the Cobra 148 GTL's.