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My cb worked fine until I switched antennas, installed a wilson 1000 mag mount, and running barefoot it's fine, but when I key up with the linear amp on, my recieve signal goes very Los and starts to make weird noises. Two of my 100ohm resisters next to the pills burned up, I replaced them, but still the same symptoms. What am I doing wrong?

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  • Master
  • 438 Answers

If your radio is working fin without the amp and when the amp is enabled a fault in receiving is evident you probably have a bie-amplifier Liner amp design , if so i should suspect the switching device in the amp is locking on transmit and your receiver is still connected to the input of the output amplifier.
when you un-key,.observe the switching relay in the amp to see if it switches when you key and un-key
for further help i must have much more detail.


Best regards Falco

Posted on Oct 15, 2013

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Posted on Jan 02, 2017

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Shuttle83
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SOURCE: Cobra 29 ANT light

I believe it to be feedback but be aware of your Standing wave ratio because using a linear amp radiates signal to the point that it could cause that light to come on. There is a problem if the radiated signal is feeding back into the amp a a higher level that it can withstand over time.

Posted on Sep 09, 2007

Gavin93
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SOURCE: will 25 amp power supply pull 250-linear?

Yes it could, but... but it also depends on your antenna, what antenna are you using. Do not upgrade the power of your radio unless you know your antenna can handle the output power.

Posted on Oct 13, 2008

Goofguyster
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SOURCE: poor receive with my Connex 3300 HP radio

get a K-30 antenna ist magnetic if that dont work your speaker in the Cb is broken

Posted on Sep 14, 2009

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SOURCE: Red RX/TX and red ANT light on my CB

Well,first hand ,some cobra radio,s have red some have green RX/TX lights, but are you modulating? Some green lights turn red. What is your standing Wave on the antenna,s? You need to check it and the output of the radio. To do this you need a watt or field strenth meter. Can get one at Radio Shack. Your standing Wave is ok as long as it is below a 2. That has to be done on the antenna. ..hope this helps...

Posted on Mar 12, 2010

Testimonial: "Thx the rx/tx light is supposed to turn red I found out. Still trying to get the antenna prob fixed though."

freetek
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SOURCE: red antenna warning indicator light stays on

The red light is a warning of antenna mismatch; when you hold the antenna, you are changing the match between the CB's output amplifier and the antenna. Try it with a different antenna or pick up a 'test light' (or test load) for CBs from an electronics dealer, I've also seen them with CB accessories at truck stops. If the test light fires off and the red light on the CB is dark, the antenna you have is junk.

Posted on Aug 01, 2010

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1 Answer

Hi chris here im using a gx300 with a 100w linear amp on the 27mhz band i can hear people but still cant seem to get out im using a staion master antenna please help tried everything


Yikes, using a linear on CB is illegal! You could get into real trouble doing that. The radio \'barefoot\' with that antenna should work very well, and will be legal. If you hear stations, but cannot contact them, there is a good possibility that the linear is not working. Or, the radio may not be putting out power. Do you have access to a watt meter or SWR meter? Find someone who has these instruments, and they can help you out. Best of luck to you!

Dec 07, 2014 | Midland Radio Midland 18-258 27MHz Window...

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Grease under the Coil of a Wilson 1000 CB antenna


Animal greases and Metal grease will conduct electricity. I use silicone grease for my receiving antennas.

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-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

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My radio is about 4 years old. A year ago I had it sent it to get worked on and everything was fine with it when it was sent it. I got a mini wil magnetic antenna mount and it worked great for about 9...


The little wil is not a terrific antenna. I have one and I can't get it less then 1.7 no matter what I do, and I have an antenna analyzer that lets me see real time what it's tuned at while adjusting the antenna. I tried it on another vehicle and I couldn't get it under 2 swr no matter how I adjusted the antenna.

A barefoot radio should be fine with an SWR of 2 or less, however I do not like to run any radio above 1.5 SWR, and I like to get it even lower then that.

I recommend stepping up to a wilson 1000. I have been able to get every wilson 1000 I have ever tuned down to at least a 1.1 SWR. A true 1.1. You cannot get a true SWR from the meter in the radio, you need an analyzer. So if you can get it too a 1.1 on an analyzer then you have a really excellent match.

Little wil is an inexpensive antenna made for some one who is not a serious CB'r. It for the guy/gal who wants a radio for emergency. If you are planning to talk a lot on the radio, go up to at least a wilson 1000.

Oct 23, 2010 | Cobra 29 WX NW ST 40-Channels Base CB...

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...

3 Answers

What antenna would you recommend for my cb? cobra 29ltd


depends on what vehicle its going on. If its a car, you don't need anything crazy, unless you are going to run a linear.

You are fine with a wilson 500/1000 mag mount or a k40 mag mount.

just make sure you tune the antenna for lowest SWR.

Sep 29, 2009 | Cobra 29 LTD CB Radio

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Is it my CB antenna or something else


First off, Midland makes a fine radio. Make sure your squelch is turned all the way down to receive distant signals (down meaning counter clockwise). The through the glass antennas are not the best thing in the world. I personally use a 102" whip and a 6" spring on a modified mirror mount. It is installed on the tailgate side of the tool box. The TX and RX is amazing. Wilson and K40 make great antennas also.

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Maximize my cobra18 WT ST


A good antenna goes along way for your transmit distants. It does close to 90% of the work on that side of things, but also remember that the radio itself does most of the recieveing. I good antenna brand to stick with is Wilson they make several units but for you a Wilson Little Wil would do the trick. There not real tall about 3' and cost around $40.00. If you want more performance a Wilson 1000 Mag mount is one of the highest performance antenna's on the market but its tall around 5' and cost somewhere around 80.00-90.00 . You can tune the radio and get alittle more out of it but not much, get a good antenna and go from there you will like it. Dont forget that any antenna has to be tuned (swr set) to the vehicle this will insure max performance.

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