Question about Cobra 29 LTD CB Radio

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Antenna I want to use a c.b. antenna for my f.m. radio . Do I need to modify the antenna, or radio, or cable. The cable will need to be spiced or addapted from coax to reach and fit into the radio. also the c.b. antenna mount is mounted into the side of the fiberglass tub of a dune buggie, will the antenna need to be gounded to the frame?

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For "receive" you would have no problems using it a you mentioned, 1/4 wave whip is nearly the same as a full wave FM.
27-28 mhz vs. 88-108 mhz = Better!
One disadvantage though..... wagging antenna will cause problems with weak stations in some locations.

Posted on Dec 22, 2008

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OUCH! Cb antennas are cut to a specific frequency. FM antennas are also cut to a specific frequency. If you ground the antenna to a frame, you short out the antenna. BAD THING. If it is a 102" whip, you would have to cut off about 2/3's of the whip to work. If there is a cylinder at the base of the antenna You would only need about 7' of the whip sticking out for it to work right. Inside the cylinder there is a coil that would make up for the missing length of a 102" whip. I would suggest finding an old CB with FM built in like one of the old SEARS CB/FM receivers.
They had the electronics built in to compensate for the varience in the old sets.

Posted on Aug 14, 2008

  • Goober Pyle Sep 08, 2010

    Seen this old post and just wanted to add a few more lines......
    Coax on a single CB antenna uses 50 ohm coax.
    Co-phased CB antennas use 75 ohm.
    Car stereos use 75 ohm.
    Improper coax will cause an impedance mismatch and less signal to the receiver.
    You can tune a receive antenna to the proper wavelength but I would try it first before cutting..... it may be a couple wavelengths off but if your in a fringe area it can help!

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1 Answer

What all do i need to hook up my realistic TRC-11 CB TRANSCEIVER. WIRES,CABLES,BATTERY etc.


You'll need to decide what style of antenna to use first. Once the antenna is mounted and the coax is run from the radio location to the antenna. Use a SWR meter to tune the antenna to the radio. Use ONLY 50 ohm coax not the coax used for cable TV. If you hear spark plug noise in the radio, then install a choke in series with the power wire. It's best to locate a wire in the fuse box that is only powered when the ignition switch is on or in the accessory position so the battery wont run down if you forget to turn off the radio.

Jan 26, 2015 | CB Radios

1 Answer

I have a cobra 29 Ltd chrome and it's squeaks when I key up


It apparently has been worked on hence you knowing it is squealing ie talkback. It's the usual checks antenna system check your ground for mount on metal to body of vehicle. Check coax pinched in door or damaged. Check the insulator is on top of Mount for antenna remembering antenna positive and ground shield is going thru mount to body. It would not hurt to check swr reading with another know good functioning radio. The squeal is often caused by RF feed back but power lead or speaker leads or coaxial cable ran near one another can do the same. Now for the pessimistic view if it has been modified yoru modulation may be to high for the gain(sensitivity) of microphone you are using which if you can turn mic gain down on radio it is not a problem but if you have not got enough range of adjustment it may have to be done internally or go with a lower gain mic. Modified radios do not play well with power mics they are marketed for the unmodified CB radios.

Jul 25, 2014 | CB Radios

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-wilson antenna installation diagrams for, Wilson Trucker2000 - display pictures of exactly, how antennas appear when being attached with coax cable, using stud mount between coax & antenna mount... -...


I have a wilson 5000 mirror mount. I mount it on the drivers side mirror on the upper cross arm that goes to the mirror. It is mounted on this arm with a bracket and a so 239 connector so I can undo it if I have to ,leaving the antenna connected.I can change coax and not have to worry about undoing the antenna. Remember one thing. The antenna has to be checked for SWR.each time you move it to a different spot or to a different truck.

Oct 11, 2011 | Cobra 29 LTD CB Radio

1 Answer

I have tried everything to get my cobra 29NW LTD radio to calibrate and i get seem to ever get it out of the red. I have ran an external ground to make sure its grounded at the mount and have a plastic...


The plastic washer is inserted in the top.
If you are calibrating radio's meter correctly to read the swr in the swr postion then it might be the radio's swr circuit you did not mention the ant light which accomplishes the same. Check the antenna with another radio or an external meter.
Now if you have had this radio modified power wise. This may indicate harmonics in your signal which the meter may read as reflected power then you must check your antenna system with another radio.
Just a side note i have had more luck with these problem just changing the coaxial cable then over analyzing it besides we could all use a spare coax. Good luck

Aug 22, 2011 | Cobra 29 LTD CB Radio

1 Answer

I just can't get any range. I drive a company truck so I do not want to modify the truck. It has a standard antenna and I nought the uniden 69 with the weather channel as well. I was thinking of buying the...


Hello cktmn,
Welcome to FixYa.
My name is John, and I will be assisting you with your issue today.
Yes, the K40 is a great antenna for that radio and it should come with the COAX on it.
It is a magnet mount and the best place to put it is on the top of the vehicle or the center of the trunk. You will be surprised as to how well it works.
I hope this was helpful to you and thanks for choosing FixYa today and in the future.
Your comments are always welcomed here.

John

Feb 24, 2011 | Uniden Bearcat Pro PC68XL 40-Channels Base...

1 Answer

Hooked up cb, blows fuse when the mic is keyed


when mic is pressed transmitter is engaged. First is the Fuse the proper fuse? Could be an antenna-coax problem. Get a dummy load and hook up to your CB and try it again. If it doesn't blow the fuse, the problem is indeed in your coax antenna system. another way to test your antenna coax is to disconnect it from the radio, take a multimeter, set it to ohms 200 ohm scale, put one lead on the center pin of the coax and the other on the outside of the connector on the coax.if it shows anything at all, you have a short and that will not work. It needs to not read anything. To be sure the antenna system is ok other than swr you can also check the coax an antenna for continuity. one lead of meter on the coax center pin then other on the antenna. should get a reading, a low value. again on the outside of the coax at the connector and at the antenna side on the outside of the coax connector. should be a low reading. but you cannot have a reading from the center of the coax to the outside of the coax. disconnect the coax at the antenna and measure from center to outside at the coax if the previous reading showed a value.If you see a value on the meter, any value, your coax has a short. not good. most likely at the coax connector. redo the connector. It is possible that the coax got compromised somehow and got smashed to the point the outside coax meets the inside and touches.
Now the other possibily your fuse blows, kis because the final output transistor is bad. So if you hook up a dummy load to your radio and the fuse still blows, then the final transistor is bad. This is probably due to a bad coax-antenna system. So before you replace any parts check the coax-antenna system first or you will have the same problem and burn out another transistor in the final. If none of this helps then just get another radio or have a god buddy look at it that knows about radios. Trade him another radio or something to fix it.

Feb 08, 2011 | CB Radios

1 Answer

Cb radio


As for me ,the Wilson 1000 or Wilson 2000 are the best mobile antenna for a mobile. I have out talked a lot of base antennas with them, just put it on the top of car in the center or trunk, or middle of cab of truck, with a good SWR and you are talking and receiving. great antenna. ...hope this helps..

Jun 01, 2010 | Cobra 29 LTD CB Radio

2 Answers

Hello, I need help with a cb problem. My radio isn't reaching or receiving any thing farther than 100 feet. I just rewired it directly to the battery and I have a fire stick antennae.


Having that short a range would give me the indication that there is a disconnect in the antenna system. Here's a couple of clues: Is the connector on the back of the radio connected to the coaxial cable?

If it is not factory installed connector, is it possible that the solder job on that connector was bad? If the cable is old, it could have a crack in the coax.

Is it the RIGHT kind of coax? It should be an RG-8, and RG-58, or a variation of those types of cable. It would likely be marked with "50 Ohm" somewhere along it's length.

Is the connection at the antenna solid? A firestick antenna for CB looks like this:

5c6b558.jpg
You must make a good connection at the base of the antenna from the center coax conductor that does NOT short it to ground, and the ground conductor should attach to the antenna mount frame.

With your symptoms, it is very likely that either the center conductor has worked loose, has become unsoldered from the terminal lug, or your coax has come unsoldered from the center pin. All of these things would really honk up your SWR, or Standing Wave Ratio, which is sort of like a string on a guitar that is tuned to a specific frequency for a specific note. The center freq of the CB band is 27.155 Mhz, so you would typically "tune" your antenna for that to be the lowest. A firestick KW is not tunable, so that should not be an issue. Look to your coax at both ends, and the coax itself to find your problem. If you have a simple ohm meter it would help to locate the short circuit. Good luck, write back if you need some assistance in further troubleshooting.

Apr 02, 2010 | CB Radios

2 Answers

I have a Cobra 29 LTD CB radio, when I hooked it up it will light up but sound and also the signal meter is not moving and it won?t tramit or receive. Yes the mic is hookup.


There may be an issue with the coax, antenna, connections, settings or a combination of them all.

Set the radio to AM, a channel of your choice, volume to just under 1/2 way, squelch to off or fully CCW. Make there is no plug in the ext speaker jack. If there is still no sound, try connecting an external speaker and try again.

Carefully check all connections for tightness and inspect the coax cable for evidence of being crushed, pinched, cut and jacket damage that could allow water to enter. Replace the coax cable if any of the mentioned problems are found.

Inspect the point that the antenna is connected to the mount / coax cable. It is not unusual for this area to become oxidized due to exposure to weather. Thoroughly clean or replace parts that can not be cleaned up.

Check the antenna for damage. If "higher than rated power" has been introduced to the antenna, it has likely failed, and will require replacement. Since CB is limited to 4W AM and 12W SSB, most antennas are rated for 25W or less.

You should obtain and connect an SWR meter with a short length of coax cable between the radio and the antenna. The meter should be rated for the frequency range of the transmitter - in this case, HF or 27Mhz (11 meters). Tune the antenna for lowest SWR over the range of frequencies by physically lengthening or shortening the whip in the base in 1/8" increments.

I hope this helps!

Oct 22, 2009 | Cobra 29 LTD CB Radio

3 Answers

ANT lite coming on for the first time when you key up and will it hurt radio


The type of coax and antenna should not matter in this case. What that light is telling you is your SWR is above a safe working level. You need to tune your antenna using an external SWR/power meter. It may also mean that there could be a bad ground or a bad connector. You probably just need to tune it up. Anything below a 2.0 SWR is acceptable.

Jul 07, 2009 | Cobra 29 LTD CB Radio

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