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I have a basic 40-channel cobra cb radio and 2 four foot firestik whips mounted in the stake holes of my truck. I have dual 18 ft. coax connecting the two which is ran through 2 small holes near my door, down through the engine, and back to the steak holes going under my truck. For the first week I got okay reception and now I am not getting any reception at all. I am wondering what the possible problems could be

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You should check the coax cables for damage . ALso, did you attach the PL-259 connectors yourself to the coax cables? They can be tricky. You need to check for loose or bad connections between coax cable and connector.
Of course it could be the radio itself went bad on you. Check this with a friend; when you connect his radio to your antenna system, does everything work then? Hope this helps.

Posted on Aug 24, 2010

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I have spotty reception on a handheld CB and was wondering if there is a testing procedure I can use to check the antenna and radio. I have a multimeter. It's a radio shack handheld with weather bands...


The antenna is your problem not much gain. Height is everything tx and rx. Although it would not compare to a conventional cb size negates performance. Seeing is believing in this case hearing get adapter to connect to standard coax of antenna. (PL259) to BNC Coax Adapter Radio Shack sells them. And dont ask or buy any radios there. They are hardly the radioshack of choice anymore.

  • If you put 4 watts into a four-foot antenna, you will get the same power out of that antenna as if you were putting 2 watts into a 102-inch whip.
  • If you put 4 watts into a 3-foot antenna you will get the same power out as if you were putting about 1.5 watts into a 102-inch whip.
  • If you put 4 watts into a 7.5 inch antenna on a hand held CB, it would put out as much power as a third of a watt into a 102-whip.
  • If you put 4 watts into a 102-inch whip antenna, it is the same output as if you put 11 watts into a 3-foot whip.
  • If you put 4 watts into a 102-inch whip antenna,, it is the same as if you put 14 watts into a 28-inch antenna.
  • If you put 4 watts into a 102-inch whip antenna, it is the same as if you put 54 watts into a 7.5 antenna.


May 21, 2011 | Cobra HH 38 WX 40-Channels Handheld CB...

1 Answer

I have a Midland 1001Z 40-Channels Base CB Radio and a Magnetic-mount CB antenna. 29" stainless steel whip and 6" spring. About 46" high overall. All bought from /www.thesource.ca in Alberta...


Try Grounding it better. Its supposed to equal 8.5 ft.(102 inches) but the coil may make that in all.You can clip like 1/8 inch off at time until it goes 2.1 Swr. Thats a good standard. 1.5 SWR is desired. If it don't have a coil with it that may be the problem. You could turn it into a 8.5 ft. antenna by buying a 102" inch whip to screw into the base of your antenna, it depends if it holds or not. You could build you a matcher like this with a solder gun+solder and 2 resistors. Get you a box with 2 female cb antenna inputs. Drill a hole for both Cb antenna inputs into box. Place them into holes screw nuts down snug. Run a copper wire inside to both grounds or a plate somewhat. Run a thick gauge copper wire from center cb ANT INPUT(2) to other input of ANT INPUT(1). Solder 2 100 ohms in parallel from input to Ground. If you could take apart your radio(eliminating the box idea). Just Solder 2 (100 ohm) resistors to your Antenna output then put it back together. 50 OHM MATCH HERE Is the main idea. I've used 75 OHM Tv coax and reduced SWR.

Apr 04, 2011 | Midland 1001Z 40-Channels Base CB Radio

1 Answer

Ok so when I bought my '97 jeep wrangler a couple of months ago it came with a CB. It is all hooked up, came with a huge antenna( 4-5ft maybe), all of the lights come on, the weatherman channel works, and...


check the sw's and the antenna. those are SHORT antennas by cb standards. a 1/4 wave is about 9ft long. a full wave is around 36 ft.. so anything shorter than the 102" whips are prone to have less range. if swr check out. the board on the 18's and 19dx styles need to be resoldered from time to time. simple fix .. don't pay more than $8 to fix the radio...

Feb 01, 2011 | Cobra 18 WX ST 40-Channels Base CB Radio

1 Answer

I have a cobra 25 ltd classic with a 102" whip. It


hello firstly it would be wise to connect your power lead directly to your battery secondly have you checked the vswr on the antenna make sure it is tuned to your radio i presume you have an swr metre and lastly check all coax connection make sure none are shortening out check pl259 at rear of radio and also check lead goin into antenna you can ajust the antenna by raising or lowering the whip .when you acheive 1.5 or better tighten up it should work ok for then
goodluck

Jan 09, 2011 | Cobra 25 LTD 40-Channels Base CB Radio

1 Answer

Hey I have a brand new cobra 25 classic ltd with eight foot whip I am receiving well but not transmitting any sugestions


Hi,my name is John. Try turning your MIC GAIN to MAX. Let me know how it goes. Could be something internal that I might could help you with...Hope this was helpful...Rate this solution on the four thumbs-up ...Good luck.... John

Oct 10, 2010 | Cobra 25 LTD 40-Channels Base CB Radio

1 Answer

What is the best antenna for this unit that is around 20$


This radio is the worst radio cobra ever made. It won't really matter what antenna you put on it.

But your not gonna get one that's any good for any radio for around $20.

You can pick up a decent fiberglass whip for around $20, that's about it. You will have to mount it with a hard mount though. If you want a decent mag mount, you going to spend at least $60 to $80.

Sep 18, 2010 | Cobra 18 WX ST 40-Channels Base CB Radio

1 Answer

Coax length


the shorter the better between radio and linear, all coax has to run in 3 ft, 18 foot is recommended for all antennas.

Mar 03, 2010 | Galaxy Radios DX-44V 40-Channels Base CB...

1 Answer

Bought a new cobra 29, need antenna advice


Firestik Dual CB Antenna Kit This is a most popular dual antenna kit and one we HIGHLY recommend! It contains everything you need and features premium USA-made components from Firestik. The included FS CB antennas are our best-selling antennas and ensure you'll receive maximum transmit and receive performance. Designed for the elements, the stainless steel springs and mounts are rust- and weather-resistant. The included three-way mounts -- the most popular style we carry-- offer numerous mounting possibilities.

Dec 22, 2009 | 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.
Tom

Jun 07, 2009 | Cobra 18 WX ST 40-Channels Base 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 wyoed1@aol.com. Good Luck
Ed
NC Electronic
Mills, Wyoming

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

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