Question about Cobra 75 WX ST 40-Channels Handheld CB Radio

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Hooked it all up per the manual, Clean power, good ground, away from other electronics, matched to a 4' firestick antenna using a proper mount. Tuned the antenna with tuner...everything...can receive the weather channel no problem bit absolutely nothing else no matter how the squelch is set.

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Have you tried it in another truck where a radio does work? If so and it didn't there either I'd say you have a bad radio.

Posted on May 04, 2010


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29 cobra ltd brand new everything swr cant set my swr pegs out all the way to the right when i key up cant even get the right hight for my 4' firestick also the antenna light is very dim

If your coax isn't shorted somewhere (which can easily happen) then I would say the problem lies in your amplifier. Your amplifier needs to be matched to your radio by adjusting the input and output capacitors. Not many so called "techs" can do this and Bubba sure as hell don't know. It take proper equipment and the right parts to do the job right.

Aug 22, 2012 | Cobra 29 LTD CB Radio

1 Answer

Added new antenna and now im failing rf output and antenna radio test?18ft coax and a 48in ant.

First thing is to be sure the mount is not shorted in any way--and also to make sure that where it is mounted it is actually connected to ground--many newer vehicles have insulators so a bumper even if metal has no ground to work off of.

No ground, open or short in coax, open or short in mounting bracket all can cause no swr or high swr.

May 01, 2012 | Cobra 29lx Cb Radio W/clock 29 Lx Lcd

1 Answer

I have hooked my the radio to a constant hot and grounded it. The antenna is a midland antenna a is window mounted. All the cables are hooked up but I cannot receive anything and all I put out is a...

You may have a couple issues. First is the whine when you key the mic. Change the mic to any newer 4 pin mic. See if this helps a bit. Also make sure your antenna is a match. Hook up an SWR meter inline and check it. 1-1:5 is the goal but no lower than 2. Your antenna is much of the set up. Spare no cost when purchasing. Do you have one of the older antennas that roll up in the window? I suggest you get at least a Wilson 300 and try that. Window mounted CB antennas do not receive the best at all. And they have no ground plane. You try what I listed and see if that don't help. Let me know if that helps.

Feb 09, 2011 | Midland 1001Z 40-Channels Base CB Radio

2 Answers

When i speak into the mic i can hear myself talk through out the truck in the audio speakers. I drive a 387 pete i got good connection its just i can hear myself when i talk through the speakers

Does your "pete" have a fiberglass body? I suspect it does. If this is the case and you are using mirror mount antennas, are they the new "no ground needed" or "ground free" antennas?
If this is the case, check or have checked your SWR. (I get a lightening bolt down my neck when I hear it called "SWR'S".)
S.W.R. stands for Standing Wave Ratio. In the words of The Highlander, "There can only be one". What this is is the amount of your signal that is being absorbed / radiated by your antenna system, (including your coax), as opposed to how much is being sent back down the coax and back into your radio. If your SWR is too high, not much is going out the antenna and is being reabsorbed by your RF FINAL, (another bolt!!!). Most radios except for some modified hams or high power exports HAVE ONLY ONE FINAL TRANSISTOR!!!. If you have a standard Cobra 29 out of the box, you have ONE final TRANSISTOR. I don't mean to yell at you. These are just my pet peaves.:) Anyway, imagine that you have a rope tied to a building. You pull it fairly taught and whip it up & down once. That wave will move away from you, hit the building and come back and shake your hand. This is high SWR as all of your power came back to you. If Superman were to shake that same rope and that wave took that building off it's foundation, this low SWR as all of his power was radiated by the building. This is how you want your antenna system to work. If your SWR is too high, your radio is trying to put out 4 watts. That same 4 watts is coming back down the line out of phase and now your final is being asked to handle 8 watts when it will only made to do 4, (all in a perfect world of course:). If you were fooled into buying these "no ground" antennas as so many truckers are, I am sorry. These should only be used as a last resort when nothing else works. These antennas have what's called a matching stub in their coax plugs in the case of the single mast marine type antenna or the antennas, (in the duals), have a matching capacitor in them. Both of these "tricks" fool the radio and SWR meter into thinking that the match on the system is acceptable when it really isn't. For electronic reasons that are really too long to explain here, (you really don't want to get me started:), the low SWR reading is only an illusion. Instead of your signal being radiated completely by your antenna, a major portion of it is being absorbed by either the matching stub or matching capicitors. All of this energy has to go somewhere so some is converted into heat energy in the matching circuits and some is re-radiated to the nearest ground. Unfortunately that will be the wiring of your truck especially if the body is fiberglass which does nothing to stop radio waves.
If you get a weekend off and your boss, (if you're not an owner / operator), doesn't mind you taking your truck home for the weekend. If you know someone with a pair of antennas and a co -phase harness that they can loan you. Set up your mirror mounts in normal fashion with STANDARD antennas. Run your co-phase harness where it won't get pinched up to your radio.
Here's the trick, gain access to the inside of BOTH doors, get ahold of some coax SHIELD braid. Preferably something heavy like off from RG-8 or atleast RG-8X. Get to the nut that holds the mirror to the door that is closest to the door hinge on BOTH DOORS. Clean it up with sand paper so it's nice and shiney AT BOTH ENDS and wrap 1 loop of braid around that bolt inside the door, put a flat washer over the braid and put the nut back on tight without breaking it of course. Take the other end of the braid to 1 bolt of the door hinge, clean it up shiney under the bolt head and matching surface of the hinge, wrap a loop of braid around then bolt and tighten it up. Be sure to leave enough slack in the braid so you don't rip it out when you open the door. Wire will work but braid is better. If you can get ahold of the wide ground strap like they used to use to ground car bodys to their engines, the bigger the better. Radio waves travel on the OUTSIDE of any conductor. Braid has more surface area than a piece of wire. BEFORE you transmit, get the SWR checked and adjusted if possible and/or necessary. I say to borrow the equipment rather than buy it at first because this works in about 85% of installations and I'd hate to see you invest in a new antenna system to find out you're one of the 15%. If this is your problem and this fix works, you'll be amased at how much farther you'll get out with all of your power making it's way out rather looking like the northern lights around you.
Good luck,
I'm going to bed now, (7:33am here). Hey, 73's to ya'.
Jeff Mc.

Jan 15, 2011 | Cobra 19 DX IV CB Radio

1 Answer

I have an old cobra hooked up worked fine the the

Sounds like you could have a bad soilder joint in the radio. If you hit the top or bottom of the radio does it help? If so its soilder. You match your antenna to your truck not the radio. You might want to recheck it.

Jul 18, 2010 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

My friend and I just purchased Cobra 29 LTD Classic CB's today as well as Wilson 110 metal whip antennas. We each have the antennas mounted in the center of our suvs' roofs. We are planning on using them...

Check your antenna. Make sure it is getting a proper ground. If mag mount; make sure base of antenna and where you put it are both super clean. Check where whip goes into coil or base. Make sure all allen screws are tight and whip is not either all the way down to the base or up to the top. If antenna is mounted; make sure that it has a good ground. You might have to remove some paint around the base to get a good connection. DO NOT TRANSMIT WITH A HIGH SWR. YOU CAN BURN OUT THE EXPENSIVE POWER OUTPUT TRANSISTOR. Hope it helps.

Jun 19, 2010 | Cobra 29 LTD CB Radio

1 Answer

No distance on cb

Check your antenna. Make sure it is getting a proper ground. If mag mount; make sure base of antenna and where you put it are both super clean. Check where whip goes into coil or base. Make sure all allen screws are tight and whip is not either all the way down to the base or up to the top. If antenna is mounted; make sure that it has a good ground. You might have to remove some paint around the base to get a good connection. DO NOT TRANSMIT WITH A HIGH SWR. YOU CAN BURN OUT THE EXPENSIVE POWER OUTPUT TRANSISTOR. Hope it helps.

Jun 07, 2009 | Cobra 18 WX ST 40-Channels Base CB Radio

1 Answer

Cobra 19 DX IV

No, those radios are good radios. I have one just for setting swrs on antennas.

First, I went back and read your last question. You said you have a nylon washer on top AND bottom? Did you mean one under on the top and bottom side of the antenna mount? You only need theone on the top of the antenna mount, which stops the antenna itself from being grounded out. Having one on the underside stops the outter part of the stud, the one that touches the outer screw on part of the coax from being grounded. Without that getting a good ground, you have no groundplane, which will cut your tx/rx to a max of 2 miles. Also, how close is the two setups. Many times, if two vehicles are setting next to each other, you will not receive or transmit properly, just get a nasty garbled with a hint of a squeal.

If this doesn't help, please reply here or shoot me an email at:

Dean Pitts
Rollin CBs
Mt. Vernon, TX

May 15, 2008 | Cobra 19 DX IV CB Radio

1 Answer

CB transmission

Hello 64driver,

Make sure the radio is grounded properly and that the SWR is around 1.2:1, 1.3:1 is good but try to get it to 1.2:1. Also take a power output reading while keying the mic. To do this with your power meter put it in-line with the CB and your antenna and key the mic you should get about 4 to 5 watts PEP. If this is the case your unit is putting out the proper power level, if not have the power amplifier checked by a qualified repair shop.

I hope this helps


May 13, 2008 | Cobra 19 DX IV CB Radio

1 Answer

Non grnd steel antena

I assume your coax is not hooked up properly or you have some kink of a short in your antenna connection ( thats if your cb is working properly ) Radio Shacks Information that suggested that the 102" whip is the perfect antenna is their opion only as I prefer to recommend a full wave antenna system to my customers, but I do assure you, the 102" whip does work well if it's properly installed. I have found the main problem in the 102" whip installation is when the center hole is cut to install the antenna, it's not cut big enough, which grounds the antenna. It's not suppose to be grounded in any fashion to the automible chassis. The ground of this antenna comes from the 3 screws mounted around the outside of the antenna mount. Check that for sure. If you can't correct the problem. write me back at this web sight of direct at Good Luck
NC Electronic
Mills, Wyoming

Dec 19, 2007 | Uniden Bearcat Pro PC68XL 40-Channels Base...

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