Question about Cobra 18 WX ST II 40-Channels Base CB Radio

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Procedures to install cb antennae mount

I bought a cb radio at a yard sale but the coax cable that it came with, one end is cut off. I know one end plugs into the cb, but what's on the other end so I can duplicate it? And, do I need to ground the antennae?

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The end without a connector was once attached to an antenna. You need a proper antenna in order to use the radio. If you were to buy a new antenna, it will come with a length of cable attached. Even if you were to buy a new antenna, don't expect good performance from the radio unless you get the antenna properly adjusted. Yes, it will work "out of the box", but probably not as good as it could. There is a device called an SWR bridge, it's used to measure the SWR and the user then adjusts the antenna for the lowest reading by trial and error adjustment of the antenna.

Posted on Jan 24, 2009

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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 | Radio Communications

1 Answer

-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

My radio receives the wx stations fine, it transmits fine but it will not receive when switched to cb, I have tryed ex speaker, still nothing. mete wont move in receive mode, but when keyed the tx is over...


Here is the list just scratching the surface.
  • Bad antenna
  • Bad coax cable ......grounding externally or internally with shield.
  • Bad/poor ground for antenna..........door to body, painted parts when mounted elsewhere.
  • Antenna installed incorrectly. Nylon grommet must insulate antenna from contact with mounting bracket. Coaxial connector must have contact with bracket for grounding.

Jul 02, 2011 | Uniden Bearcat Pro PC68LTW 40-Channels...

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:

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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 | Radio Communications

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

2 Answers

Not able to transmit or recieve on cb radio in car


It could be your ant. a broken coax wire or a bad ground could cause this a could a broken or shorted wire on your mic.

Jun 02, 2009 | Maxon Radio Communications

3 Answers

With my CB I am getting feedback through the am fm radio speakers


Hello there:
the shielded coax rgu-45 series is probably the best one for this application also if you run the radio to a different fuse or u can also get a surpression filter that goes on the coax line I own a WL9000 KW. i had the same problem untill i got the filter installed at a loves truck stop in texas and no more problems since ok?
drive safe and best regards mike (warner transp.)

Mar 26, 2009 | Uniden Radio Communications

1 Answer

Cobra 29 LTD Classic not transmitting or receiving


ant. light should only come on if you have a high vswr a bad thing did you check that cb/pa switch is set to cb check your swr this is not a good place to mount ant. as it is close to metal of back of cab

Dec 20, 2008 | Cobra 29 LTD CB Radio

1 Answer

Cobra 29 LTD Classic not transmitting or receiving


As I understand from a tech friend of mine, most truck beds are not grounded well enough. Perhaps you could borrow/purchase a magnet mount antenna and locate it on the roof, for testing. Then you would have it narrowed down to the location.

Dec 05, 2008 | Cobra 29 LTD CB Radio

2 Answers

Antenna


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.

Jul 30, 2008 | Cobra 29 LTD CB Radio

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