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The swr and signal lights went out how do i fix them

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When you say lights , do you mean LED's? There is a host of answers for this. Could be LEDs but I doubt that, could be sensor parts, most likely. If you have schematic, very easy to find on Internet. Use a good volt ohm meter an search out the parts an check each out. Could be an easy fix such as a cable or small component.

Posted on Apr 30, 2017

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1 Answer

Attenna warning light


Is showing a bad swr which will only happen when transmitting. Get a swr meter and patch lead and tune your antenna for the lowest swr on channel 20 or middle frequency of your rigs frequency coverage. Easy fixed.

Jan 12, 2014 | Uniden Pc76xlw 40 Channel Cb

1 Answer

When i press the mike two red lights are coming on end the reception isn't good how do i fix this problem


Green changing to Red it normal operation from receive to transmit.

However the ant light should not light it is to indicate the SWR= standing wave ratio.This does not normally indicate any reduction in you ability to receive signal it only refers to reflected power from you antenna system to your receiver/cb. You may have a insulator in the wrong location. If it is an solid mirror or body mount the mount must be grounded with no insulator on coax side and an insulator on the antenna top of mount antenna must not be grounded.
If you have a coax that is damaged and i mean even bend from pasting thru a door or other "pinch point" it may be bad.
http://www.firestik.com/Meas-SWR.htm

Sep 16, 2011 | Cobra 29 LTD CB Radio

1 Answer

DX 2517 keys up, light turns red, audio shows on meter, and through talkback, but no signal at all. whats goin on?


You need an SWR-PWR meter ($20) to run between radio and antenna to see 1) if you are transmitting and 2) if the is a problem with the antenna (SWR). There may be a bad antenna connection or it is grounded out. If the SWR and antenna check out you may have damaged your finals in the radio.

Feb 25, 2011 | Radio Communications

1 Answer

I have weak talk back signal


Did you tune the antenna??

The antenna needs to be tuned for best SWR.

If the antenna is not the right length, then you will get signal reflecting back into the radio. this is bad and it can damage a radio.

The 29 has a built in SWR meter.

The lower the SWR the better.

Here is how to check the swr.

Turn to ch 20. Put the sf swr cap switch to CAL. Key the radio. With the radio keyed, turn the cal knob up until the meter is all the way to the right on the cal mark. with the radio still keyed, flip the switch to SWR. Where ever the needle falls is your swr reading. The top line is SWR. If it is above 3 this is really bad, and your antenna is no tuned and you are hurting your radio. You need to adjust the antenna length.

Turn to ch 1 and take an SWR reading the way I explained. Then do the same on ch 40. IF the SWR is lower on ch 1 then 40, your antenna is too short, make it longer. The antenna has a way of adjusting it. Usually the whip slides up or down in a colar.

If the swr is higher on ch 40 then 1, it is too long, and you need to make it shorter.

Keep making adjustments until the reading on 1 and 40 get lower, and are about the same.

Then check ch 20 again. It should be low, 1.5 or under. Then you are good to go.

you will find people hear you a lot better, way better then ever.

Jun 30, 2010 | Cobra 29 LTD CB Radio

2 Answers

When i key up the mike the tx/rx light and the ant


your swr setting are off wack fix your swr

Oct 02, 2009 | Cobra 29 LTD CB Radio

1 Answer

The ant light and the other light light up red when i key the kic


the tx/rx liight is green when your radio is recieving signals and turns red when you are sending signals. the ANT light is red when your SWR is too high (over 3)

1. turn the knob labeled swr cal all the way counter clockwise
2. set the rf swr cal switch to the CAL position
3 key up the mic and hold it while you rotate the swr cal knob until the needle reaches the swr cal postition
4. set the swr cal rf switch to the swr position
5. key up the mic while on chanel one (record the the number)
6. switch to chanel 40 key up the mic (record the number)
if the number on chanel one is lower than the number on chanel 40 then your antenna is too long.

Sep 14, 2009 | Cobra 29 LTD CB Radio

1 Answer

Antenna light comes on when trying to transmit


Its the antenna. it is not tuned correctly for the radio. First, stop transmitting. You can burn out the final transistor. If the antenna light is coming on, that means your SWR is too high,


first. Check to make sure that the antenna coax is securely attached and fastened tightly to both the radio and antenna.

Next inspect the coax. Make sure there is no damage to it. If there is a slice in it, it is kinked really bad, that could be the problem.

Now, if the coax looks good and is connected tightly, now its on to tuning the antenna. Your antenna is either too long or too short. Antenna's usually have a way to adjust this. Most common is where a metal whip sits in a collar. You loosen the collar, and you can move the whip up and down in it. That is how you adjust the length of your antenna. Fiberglas whips usually have an adjustment at the tip that you can adjust usually by screwing it in or out.

Now here is how to check your SWR.

Make sure you are in an open area like a parking lot as structures such as buildings and trees can cause reflection and give you a false reading. Always take an SWR reading with your doors and windows shut as not doing so can also cause a false reading.

Now that you are in an open area, turn on the radio and turn to channel 20. flip the switch located all the way to the left by the signal meter to CAL. Now turn the knob all the way to the right just before the channel selector marked SWR CAL all the way down to the left before you start. Now key the mic without talking into it and turn the SWR CAL knob up until the needle on the meter is all the way to the right to the mark for CAL. its a little upside down triangle with the letters CAL next to it. You want the needle to be on that triangle. Now while still holding the key in, flip the switch all the way to the left next to the signal meter up once to SWR.

The needle should swing back giving you your SWR reading. Ideally you want this reading to be as low as possible, but 1.5 and under is acceptable. If it is higher then 3 and in the RED stop transmitting. Try to do the steps quickly so you can un key as soon as possible to avoid damage to the final resistor if the SWR is higher then 3.

If the reading is 1.5 or under and the ant light is going on, it could be something else. I will go more into this at the end.

Now we have to figure out if the antenna is too long or too short. Here is how to do this.

Turn to channel 1 and repeat the steps to take an SWR reading. Make note of the reading.

Turn to channel 40 and repeat the steps again to take an SWR reading. Not that number.

If the SWR is higher on channel 40 then channel 1, then your antenna is too long and you need to adjust your antenna so it is lower.

If the SWR is higher on channel 1 then on channel 40, then the antenna is too short, and you need to adjust the antenna higher.

If the signal is over 3 on both channels, then there is something wrong with either your coax, antenna or both, and you should replace the coax, and if its still high, the antenna.

If your antenna is too long or too short, make adjustments to correct. Raise or lower the antenna a 1/4 inch at a time. each time taking a measurement to see if it is still to long or too short. You want to try to get the SWR the same on 1 as on 40. And channel 20 will have the lowest reading.

If your SWR reads low, under 1.5, or even a 2, the light should not come on. If you have had the radio worked on at a radio shop, or purchased it from some where that modifies the radio to put out more power before they sell it, then that can cause that light to go on falsely. Purchase an external SWR meter. You can get one off ebay, or from radioshack. Check the SWR with the meter, and if the SWR is still good, then you can do 1 of the following.

1. ignore the light because it is not right.

2. go in the radio and try to adjust VR6 so that the light doesn't go on. Not recommended if you don't know what you are doing.
3. take it to a cb shop and have them adjust VR6 for you.

I would leave it alone.

Most likely your antenna is not tuned properly.

Apr 26, 2009 | Cobra 29 LTD CB Radio

2 Answers

My Meter Won't Move


weather can effect your meter .Those meters are not very accurate just a base line get a good swr meter and then check it.If your getting good radio checks it could be the potentoimeter is dirty . Radio shack sells contact cleaner and lube try cleaning it . That might help

Jan 08, 2008 | Cobra 29 LTD CB Radio

4 Answers

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.

Sep 08, 2007 | Cobra 29 LTD CB Radio

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