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

2 Answers

Can't talk long distance seems I can only talk for a hundred yards and then I can't hear other drivers


  • Hi, I can help.

  • The most important part of a CB set up is the antenna and the coax/connectors being used. Make sure your antenna is a good one. If you want a suggestion on a good one leave a comment with your budget and weather your using a mobile/base set up. Make sure your connection is goo. Check the PL259 and make sure the braids have not split off for inside. Soldier a new one on if necessary.

  • I will give you some instructions to peak your CB and adjust the receive. Make sure the CB ha no power and use a plastic screwdriver inside your radio.

  1. Pull the bottom cover off of your radio.
  2. Put a watt/power/SWR meter inline.
  3. VR1 is your receive gain, adjust that to pick up from farther away. Note white noise can occur along with this as you will be sensitizing the front end.
  4. Adjust VR4 for 100% modulation (swing)
  5. Right by the final is a can with some glue on it. Scrape the glue off and turn that ferrite out until your power output is 4 watts RMS (not bird)
  6. Your Cobra 29 is now peaked and tuned as much as possible without using a Oscilloscope. And doing this this way will not require a re-alignment afterward.
  • Don't touch any other pots in the radio.

  • If you have any comments please feel free to leave them here.
  • Hope this helps and thank you for using FixYa.

Regards, Tony

Sep 19, 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...

1 Answer

I can occasionally hear people talking on my cobra 29ltd classic but it is hardly ever clear and i dont think they can hear me.any suggestions?


Sounds like you need a tech to "ALIGN" your radio! I have one of the same radios I bought at a yard sale last summer. I just haven't taken it to a tech yet. I have to many radios! lol
"WILDCAT" IN LAURELVILLE OHIO
35 YEARS IN THE CB RADIO WORLD

Dec 29, 2010 | Cobra 29 LTD CB Radio

1 Answer

Hi, have a 477 meg UHF and I am wondering if I can use the same coax and base for my 27 meg cb with it's correct antenna, as I won't likely use both radios at the same time?


You will likely need different connectors (or adapters) at both ends of the cable, but the cable itself should be fine. Just verify that the cable is 50-ohm (it should be marked on the cable) before you start running the CB through it.

Bill B.

Oct 27, 2010 | Uniden PRO510XL 40-Channels Base CB Radio

1 Answer

Cb only has 200 yard range -- after that I can not hear anyone.


Check the antenna feeder with a meter (resistance range), try disconnecting the antenna from the end also this will check faults on the cable, if there is a resistance this usually means faulty feeder. If there is an infinatly high resistance this is fine. (open circuit)

or
Get a power meter and check the output power, if its lower than whatever high power should be 4-5watts on a non-sideband radio, then your output transistor/driver has blown.

Jun 15, 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:

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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

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