Question about Cobra 29 LTD CB Radio

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My swr rating is really, towards 3 on everychannel. tried to ground the anntennas and it didnt work. thanks.

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3.0 is way too high for the SWR reading. Check your coax and length. I always preferred 3-foot increments, such as 12, 15 , 18 feet, etc. 18' is good because that's a half-wavelength for the middle of the Citizen's Band frequencies. Check grounding at the antenna mount. Also, I have run across "floating grounds" between the truck body and frame...not too often though. That will cause a high standing wave ratio. If you're using a fibreglass antenna, make certain wire has not been cut, or broken from the tip of the rod. If so, that can make an antenna/radio very difficult to tune properly. Try another antenna on the mount if necessary. I hope you find this problem, because it's not good for the transmitter to be subjected to a high amount of reflected RF power coming back to the radio, for very long. Good luck.

Posted on Sep 01, 2010

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1 Answer

When keying the mike the needle goes all the way to the right


Have you checked the SWR's on the anntenna. Make sure all the coax connections are tight and not loose on the so239 connections.

Dec 14, 2013 | Cobra 29 LTD CB Radio

1 Answer

I can only hear the others. When I talk they can't hear and my red anntenna keeps coming on when I push button to talk.


Assuming the antenna is mounted and grounded correctly,when you try to transmit/talk does your meter needle move to the right with your voice,if it doesn't make sure meter knob is set to receive/transmit or mod[modulate] does it move to right now,if not make sure the mic gain knob is turned up or if it is a power mic,is it turned up&have a fresh battery.The antenna light could mean high swr readings which you will have to adjust by tuning the antenna with the radio meter or external meter,you can search swr adjustment on your computer if unfamiliar..some antenna warning lights are factory set too sensitive but most times are telling you there is a problem.If all is set&tuned properly and you still can't get a local signal to respond, your radios transmit finals could be blown,which you'll need a qualified radio tech to determine..Good luck& 73's

Aug 13, 2011 | Cobra 29 LTD CB Radio

1 Answer

I have a connex 33tlm3 works good whith litllie ant squels whith big could something be tuned up to much


Hi jeremy, my name is John. Welcome to FixYa. I think you are saying you are trying two different antenna,s. With the big one, sounds like you have a high SWR. or a bad ground. Make sure that your antenna is grounded good and nothing is blocking it. You will need a SWR meter and a three foot jumper to check this. How to check this is take one end of the coax jumper and run it to the radio and the other end to the meter where it is marked radio. Now take the antenna and put it in the other fitting marked ANT. Set the dial on the meter to SWR SET then turn off all your modulation,MIC GAIN, POWER MIC, now key the MIC and adjust the needle where it says calibrate all the way to the edge of the scale, not going past the edge, with the MIC still keyed up, turn the switch to SWR. that reading you see on the scale is your SWR. If it reads a three (3) or over, it is to high. Depending on your antenna, there are adjustments. Thanks for choosing FixYa...John

Dec 08, 2010 | Connex 3300 240-Channels Base CB Radio

1 Answer

I am showing a antenna issue with both my galaxcy and the new cobra cb i bought i replaced the wire with a 18in but still didnt solve the problem


Did you try adjusting the antenna for lowest SWR? If so, the problem could be your antenna. It might be a poor antenna.



It is important to tune your CB radio antenna to the proper length. The length must exactly match the wavelength of the frequency you transmit on. Or be really really close.

All Cb antenna's have a way to adjust the length of the antenna. If it's a mag mount, the metal whip can be slid in and out of a metal collar. Usually a set screw. If its a fiberglass whip, the way to tune it is on top. It either has a small metal rod with a set screw to adjust the length, or it threads in and out to adjust length.

Either type you have it will need to be adjusted for proper length. Here is how to tune the antenna to lowest SWR.

Some radios have a built in SWR meter. Some do not. If yours doesn't have an SWR meter, then you have to use an external SWR meter. Radio shack carries one, and you can find them cheap on ebay.

If you have a built in SWR meter or external, the procedure is the same:

1. Turn the radio to CH 20.(This is the center of the band.)
2. Switch the meter switch to CAL. (CAL stand for calibrate.
3. Key the radio. (Important. Do not talk while keying the radio.)
4. turn the CAL knob up until the meter hits the CAL mark.
5. Now while still keying the radio flip the meter switch to SWR.

Where the meter falls after that point is you SWR reading. If its above 3, that is real bad. 2 is not gonna kill your radio but its not the greatest. 1.5 and under is a good place to be, but the lower the better.

If your SWR is high, Here is how to find out if your antenna is too long or too short.

1. Turn to CH 1
2. Repeat SWR procedure. You must calibrate every time you do it.
3. Remember the SWR reading.
4. Turn to CH 40.
5. Again repeat SWR procedure.
6. Compare the reading between CH 1 and CH 40.

Now if the SWR is higher on channel 1 then channel 40 your antenna is too short. You must make it longer.

If the SWR is longer on channel 40 then on channel 1, then the antenna is too long, you need to make it shorter.

Make height adjustments about an eight inch at a time, and take reading each time.

once the SWR is significantly lower and the reading on channel 1 and 40 are about the same, you a about matched. At this point turn the radio to the center of the band, channel 20 and take an SWR reading.

You should now have a low SWR reading, 1.5 or under. If you are 1.5 or under, you are good to go.

If you cannot get the SWR to an appropriate level, there may be an antenna problem.

Oct 18, 2010 | Cobra Radio Communications

1 Answer

Ant warning lite comes on above ch 13- 40 but is off on ch 1-13


Hi, my name is John. Some radios are tuned a little different than others, have someone check your SWR on your antenna. They can do it for free at Radio Shack. Nothing really to worry about, make sure your getting a good ground on it. Rate this solution on the thumbs.thanks.John

Sep 05, 2010 | Radio Communications

1 Answer

Cant get SWR below 3.5


A ground wire will not replace the lack of ground plane. Try a different antenna altogether (possibly one with a magnet mount) and mount it on some metal surface like even the front hood and retest.

I am sure the problem you will find is with the lack of a proper ground plane.

May 31, 2009 | Cobra 29 LTD CB Radio

1 Answer

I inherited a disfunctional SIRPNP2. The signal strength meter in the lower left corner always displays an "x". Anyone have an idea? Thanks


A couple of things to try. First, try pulling out the anntenna from the back just slightly. My SIRPNP2 gets a better connection that way. Also, check to make sure that your annenna isn't bad. If you have a friend that has Sirius, connect their anntenna to your unit. If it works, replace your anntenna.

Apr 24, 2009 | Audiovox SIRPNP2 SIRIUS Radio Receiver

2 Answers

Cb transmitting problem


Hello kaelea,

 

Check your ground wire and by your post I gather that you are user some form of headphone device, I say this because normally the speaker is off when the microphone is keyed. I would also check the controls on the headset if you are using one.

 

I hope this helps,

 

Thank you,

Shuttle83

Oct 16, 2007 | Cobra 19 DX IV CB Radio

3 Answers

Antenna


Checking and setting the swr can only be accomplished with an inline swr meter, not with the radios swr cal switch and the radios meter. Once you have set the swr of the antenna, you cal the radios meter to reflect the actual swr reading and use it like a dummy light on a car, just as an indicator of high swrs. To set your swr:

You must have an inline swr meter, which can be purchased online or from a truck stop. The ones at truck stops are cheap ones, but will do the trick for the most part.

You connect your antenna 18ft coax to the antenna plug of the swr meter, and a jumper coax (any length) to the transmitter plug of the swr meter and then to the radio.

Close all doors and make sure no one is messing around with the vehicle or antenna. You must be set up as you would normally be transmitting.

Now set your cb radio to channel 40 and your swr meter to fwd. Key up your microphone1.gif and at the same time turn the set knob on the swr meter until the needle is at the line that reads set. Unkey your mic and set the the swr meter to ref. Key up again and note what your reading is. Now leave the swr meter in ref and turn the cb to channel 1. Key up and take your reading. If the reading on ch 1 is higher than ch 40 you must raise the stinger on your antenna. If ch 1 is lower than 40, you lower your stinger. You are trying to get lower than a reading of 3 and as close to 1.5 as possible. If you lower your stinger as far into the antenna as it will go and you need it shorter, you cut the bottom of your stinger no more than 1/2" at a time, and recheck your swr reading after each cut.

Once you have gotten the best reading you can, connect your antenna directly back to the radio.

The setting of your swrs is to make your antenna as efficient as possible, by trying to get it as close as you can to a 50ohm impedance. THE ONLY PART OF YOUR SYSTEM THAT CAN CHANGE YOUR SWR IS YOUR ANTENNA, not your coax and not your radio. Your radio and coax can give you false readings, but only the antenna can actually change the swr.

On the swr meter, the fwd/ref switch stands for forward (power that is being transmitted out) and reflected (power that is reflected back into the radio.

Just for information sake, the swr cal switch on your radio is used to set the meter to reflect the swr that your antenna is set at. The meter on your radio is like a dummy light on your car. ONCE AGAIN, YOU CAN NOT SET YOUR SWR ON YOUR RADIO, only the antenna.

Dean
Rollin CBs
Mt. Vernon, TX

Aug 23, 2007 | Cobra 29 LTD CB Radio

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