Question about Cobra 29 WX NW ST 40-Channels Base CB Radio

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Bad static I have mine set up with dual fiberglass antennas, i dont know what kind, they come stock with frieghtliners. Powerlines cause static bad enough that my squelch has to be turned all the way up. And stop lights i also have to turn down the gain. Also i don't know if this will help or is related but i never get a weather channel at all anywhere and i know a few come in where i am cause they came in in my old truckand on my stereo. That part doesnt really matter to me as i use the weather channels on my stereo, just thought it may help.

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Re: bad static

The Cobra 20 NW ST Wx is ( in my opion ) a very poor receiving radio. The ST is a bummer in all Cobra radios. The Static is apparent for the atmospheric conditioons and definally power lines and any high voltage will be picked up. When I get a customer with similiar complaints ( and there are a bunch ) I normally recommend that we turn the receive senativity down a bit. Sorry for this advise.

NC Electronic
Mills, Wyoming

Posted on Jan 07, 2008

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I just bought a cobra 29 LTD Chrome along with a 102" whip and spring. Best place to install antenna on semi dump truck? Suggestions? And how critical are your surroundings when tuning the antenna?

what kind of truck? does it have a fiberglass body? If it does then you would have to go directly to the chassis to mount the antenna.If you got a different antenna , like a Wilson 2000 , you could either run it co-phased or single. you would have to get mirror mounts and coax or buy a kit that has it included . Tuning a single antenna is easy but a twin is harder to do. you have to tune each antenna individually. what you also have to do is stay clear of buildings, overhead electrical wires ( high tension ) and metal objects. Now we know this is impossible so just get the SWR down as low as you can and also make sure your doors a both closed when checking the swr.

Aug 27, 2015 | Cobra CB Radios

1 Answer

I can't get my swr to go down on my general lee cb radio

what kind of antenna do you have? Does it have antenna adjustment screws on it or is it a fiberglass antenna? If it is an adjustable antenna you have to raise the whip or lower it depending on what you have for a reading . Use an external SWR meter,don't go by the one on the radio,that's just for quick reference .Get the match down to at least 1.5 - 2 and you are good but now, if its a fiberglass antenna ,some have an adjustment screw others don't. If it doesn't have a screw on the tip and you have to shorten the antenna you will have to trim off some of the tip but if you have to lengthen it you may want to add a spring at the bottom connection to your mount.

Aug 11, 2015 | CB Radios

1 Answer

How to set standing wave

The SWR is set by the antenna. It depends on the type of antenna you have as to the correct procedure. If the antenna has a stainless steel whip then a set screw is loosened so that the whip can be adjusted up and down. Most Fiberglass antennas have to be trimmed. Some of the fiberglass antennas have tuning adjustments under the rubber cap on the end. Check you SWR on channel 1 and on channel 40. If it is higher on 40 than it is on channel 1 then your antenna is too long and needs to be shortened. If your SWR is higher on 1 and lower on 40 then the antenna is too short. There are many articles on the web concerning SWR. I urge you to read up because having the SWR set on your rig will ensure many years of good operation and performance.

Mar 10, 2013 | Cobra CB Radios

1 Answer

Having trouble setting swr .moved anttena up and down 1/4 inch at a time and there is no change

There are several things that can cause you not to be able to get an acceptable SWR.

The first is the most obvious. Poor antenna, or bad coax. Make sure your coax is good. Make sure the antenna is mounted in a good location.

Some things I have seen that cause this problem.

  • Wilson Little wil, almost impossible to get under a 1.6 SWR.
  • Fiberglass antenna's, a break in the wire near the top of the antenna. Will show the antenna as being too short, and adjusting the top will do nothing. This antenna is no good.
  • Common mode current. This is when the RF is traveling back down the outside of the coax, and or causes the coax to act like part of the antenna. SOLUTION. As close to the antenna as you can, take 6 to 8 inches of coax, and coil it into a tight coil, about the diameter of a spray paint can. In fact using a spray can to wrap the coax around works well. Use electrical tape to secure the coil so that it will stay tight and uniform. This will stop common mode.
  • missing foil/vinyl membrane on bottom of magmount antenna. This is essential for the antenna to see ground plane.
  • bad connections on coax connector.
  • Cracked isolator on stud mount.
  • incorrect procedure for taking SWR reading.
  • Poor location of antenna. E.g. antenna's load not above roof of vehicle.
  • Incorrect length whip being used.
  • corrosion of any part of the antenna system.
There are some cheap antenna's out there that you just can't get lower then say a 1.5 or worse, like the wilson little wil. Wilson makes great antenna's. The 500, 1000 and 5000, as well as their silver load antenna's are excellent. I have been able to get them all to at least a 1.1 SWR, and some like the 5000, and silver load fiberglass whip to 1.0 using an analyzer. The Little will is just a poor antenna. Anything under 2.0 SWR is okay of a barefoot radio, although I don't like going over 1.5 my self. A barefoot radio, will do a 2 swr all day. If the radio is stock, and not peaked and tuned, 2 swr is fine and won't hurt the radio.

You should always try to get the lowest SWR that you can in any case. The lower the SWR, the more RF energy is leaving the antenna. As well, receive will improve the closer you get to a perfect match. This is known as being "On Que".

Check everything I have listed that applies. And if nothing fixes it, you may want to try a different antenna. Some antenna's just don't work well on certain vehicles.

Oct 13, 2010 | Cobra 29 WX NW ST 40-Channels Base CB...

1 Answer

Breaking up

Hello richf, With out a complete rundown of what you have, I'm sort of guessing here, but I'd say offhand that you are not using a base antenna. Most "full waves" are usually mobile fiberglass antennas. If this the case, Get the antenna above the metal siding, you might be getting a "reflection" back from the metal skin and causing a extreme high SWR which will cause damage to your radio, from a short period of talking. Either go higher up to clear the siding or put up a mast pipe and order or buy an Antron 1/2 wave base antenna. Those are a 3 piece fiberglass base ant. that is tunable for different situations. Run roughly about $50.00 but solves so many problems,,,Let me know more info and I'll try to help the best I can,,, Mechanic

Nov 01, 2008 | Cobra 25 LTD 40-Channels Base CB Radio

2 Answers

Terrible static

What type of antennae are you using? If you are using an aluminum or stainless steel ant, I would suggest switching ti a fiberglass ant. It sounds like the metal ant is picking up the ambient voltage from the lines. If you are using a fiberglass already let me know, as you may have a more serious problem. Good Luck and I hope this helpsd L8R

Sep 17, 2007 | Cobra 29 LTD CB Radio

8 Answers

Red Lights

Thoroughly check your antenna connection, be certain the plastic grommet is in place (and not cracked) between the bottom of the antenna adaptor stud and your antenna mount, and check for corrosion in and around your antenna connections. If using a fiberglass antenna, check for cracked outer insulation. If a whip, be sure the Allen screws are tight and the antenna is getting a good connection. If you have a base-loaded whip antenna (Wilson 2000) make sure the base coil plastic case isn't cracked. If you find anything wrong, invest in a new antenna. If all that checks out, buy a new 18 foot piece of coax (around $20, or get the best quality you can afford) and run it to the antenna. You may have skinned the coaxial shielded outer insulation somewhere in the uninstall/install process, it only takes one tiny break to cause problems. Be sure not to run the coax through the door jamb or a window where it WILL be pinched and cause trouble, take time to run it under the dash and out a permanent vent access or through the firewall.

Nov 20, 2006 | Cobra 29 LTD CB Radio

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