Question about Cobra 29 LTD CHR CB Radio Chrome Special Edition

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When my calibration needle is all the way in the area my swr is really high

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When your needle is all the way in the RED, your swr IS really high. That's what the meter is telling you. You need to clean all of the antenna connection points and adjust the length of the antenna to reduce the SWR (standing wave ratio) which is basically resistance to transmitting signals.

Posted on Oct 15, 2013

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SOURCE: high SWR

the problem is in the antenna cable. the lenth of a antenna cable must be divisable by 3. try replaceing cable with a 18 foot cable that should fix the problem.

Posted on Apr 22, 2009

  • 773 Answers

SOURCE: Cobra 29 ltd classic needle doesn't work correctly

Don't worry about the meter in the radio. They are only close to actual reading any way. Just get an external meter. you are better off in the long run, and you don't have to mess with anything inside the radio if you don't know what your doing.

If you must have the meter working correctly, then take it to a truck stop CB shop, or any other cb shop and have it aligned. It should cost about $30. There is equipment needed to align a radio properly and the cost for it far exceeds what an external meter, or having a cb shop align the radio.

Posted on Apr 25, 2009

tbirdfan1
  • 3051 Answers

SOURCE: Cobra 29 SWR, cal meter

Hello there:
Rule of thumb is go by what the manual tells you. providing it is the manual that is for the radio.. that is why they make manuals for that particular radio a 1-1 to a 1-2 swr rating is really good providing you have no saturation on the internal filter. over saturation due to swr being set too high will eventually burn out the finals of a radio
i have delt with radio's for about 17 years now so i really suggest consult the users manual and always use only a authorized dealer for that particular radio just like my cobra 2000 i am not going to send it to a shop that just does radios i want a authorized cobra dealer ok i hope that this really helps ok please dont forget to give this solution a rate for me it helps me out so i can continue to help out others like yourself.
best regards
MICHAEL

Posted on Aug 23, 2009

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1 Answer

Swr meter manual


Check your antenna
are you using the correct antenna?
What kind of antenna are you using?
I recommend a dipole antena,at CB use 1.65 meters per side.
with RG 58 -50 Ohms
It is a very easy type of antenna and very,very cheap

Oct 15, 2013 | Cobra 29 LTD CB Radio

1 Answer

The light for high swr keeps coming on. replaced antenna and coaxle. how do i go about lowering the swr. is there a nob or switch for this. thank you


You cannot lower the SWR via the radio. it has to do with the antenna. The length of the antenna is essential to transmitting properly. It must match the transmitting frequency.

To check SWR tune to ch 20. Flip the meter switch to CAL. Key the radio without talking into the radio. Turn the CAL knob up until the meter needle is at the CAL mark. Unkey the mic. Flip the meter switch to SWR. key the radio again, and the meter will show your SWR. We already know it is high because you are getting antenna warning, but we will have a base line now to work on.

What you did was calibrate the meter for that channel. that is necessary to check the SWR. So you must calibrate for each channel you check.

You should at least be under 2 swr. Ideal is 1.5 or under. the lower the better.

If your SWR is high, your antenna is either too long or too short. To find out here is what you do:

Check the SWR on ch 1 and ch 40 calibrating for each channel. Compare the difference of the SWR between 1 and 40. If the SWR is higher on 40 then 1, your antenna is too long. If your SWR is higher on 1 then 40 your antenna is too short. All CB antennas have a way to adjust the length.

If its a mag mount, its usually a set screw you loosen to raise or lower the whip. Fiberglass antenna's usually have something under the cap at the tip to adjust. It will either be like the mag mount, with a set screw and a small rod to raise or lower it, or a screw, that you screw in or out to make it longer or shorter.

make small adjustments. 1/8th or a 1/4 of an inch at a time. Each time you make a change, take an SWR reading on 1 and 40 again and compare the difference. The difference should be getting less. Do this until there is very little or no difference between 1 and 40.

Then you go back to 20, because it is the center channel and check the SWR there. It should now be low. If you did a good job it will be under 1.5 and you are good to go.

Aug 07, 2011 | Galaxy Radios DX-93T Base CB Radio

1 Answer

My ANT light comes on when ever i push the mic button but my SWR isnt that high


The meter will be more accurate and an external meter will be even better. If they show good disregard the ant light it is adjustable. It may have been set to sensitive from factory. These erroneous SWR reading can be the side effects of a PEAK & TUNE if the coils have been spread but that should also show on meter.
SWR meter calibrations
  • Switch (S/RF SWR CAL) to the CAL position.
  • Push and hold mic button
  • While holding mic button adjust the SWR CAL knob so the meter needle swings to the CAL mark on the meter
  • While still holding down the mic button, set the (S/RF SWR CAL) switch to the SWR position, to read the SWR reading. Note: When switched to SWR position the meter needle should ideally be as far to the left as possible. Anything over 3 is not acceptable.

Jul 28, 2011 | Cobra 29 LTD CB Radio

2 Answers

I have a swr meter and i would like to no how to ues it


Goto channels 1 20 and 40 and do the following.... this a generic calibrate all swr meters have different buttons different style of meters etc...
set meter too the set/cal/fwd position. key mic adjust the meters needle to cal spot should have an arrow or red line etc. then change switch to swr/rev too show your reflected swr.

ch 1 is longer wavelength than ch 40.
if ch 1 is good swr and ch40 is high swr-- then make antenna shorter
if ch 40 is good swr and ch 1 is high swr-- then make antenna longer.
then try to get a good balance between the lowest freq and the highest freq./ch.
-- anymhz(dot)com ---- Radio Shop

Dec 06, 2010 | Radio Communications

1 Answer

I have full power but no white noise as they call it.it wont calibrate either.when useing swr or calibrate switch.


Turn your RF gain all the way up. There is no need to turn it down. Make sure the squelch is down. Also, some days it's just really quiet out. You can turn the radio on some day and hear nothing. Or you could have a problem with the mic.

As for the calibrating. You do not calibrate the radio. that is for calibrating the meter to read the SWR of the antenna. Here is how to tune our 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.

Nov 12, 2010 | Cobra 29 LTD CB Radio

1 Answer

29 LTD CB Radio: Calibrate cb radio...


The CAL is to calibrate meter for reading SWR (standing wave ratio) which is reflected power when transmitting back to receiver(radio) from antenna system.
This CAL switch position when selected and mic keyed uses the CAL knob to align the meter needle with inverted red triangle next to cal on meter. Then when you select SWR switch position meter will display accurately when mic is keyed for that channel. Now notice the difference when you go between channels 1 and 40. The ant led light will act as idiot light if it is not lit then you are most likely safe to transmit.
I say system because your vehicle, antenna and coaxial cable are all part of this system. When you have a high reading and have to trim you antenna this is really calibrating the antenna to the vehicles body which acts as a ground plane.

May 16, 2010 | Cobra 29 LTD CB Radio

1 Answer

How do i calibrate an Aries swr 420 meter for a cb radio


To calibrate the meter set the switch to FWD/CAL/REF and key the microphone without speaking into it. then turn the control until the needle is on CAL. Unkey the mic, set the switch to SWR and then key the mic to read the SWR.

Thanks,
Dodgem250.com

Apr 16, 2010 | Radio Communications

1 Answer

How to set SWR readings to my K40 Antenna without a meter


If you have a cobra 29 then you have a meter. There is no way to Tune an antenna without a meter. You need a device that can read the reflect, or Standing Wave Ratio.That is a standing wave of RF energy that instead of leaving the antenna, is going back down the feed line to the radio and in time hurting the radio.

If you have a cobra 29 LTD, it has a build in SWR meter. It is not as accurate as an in line meter, but it will get it close enough not to hurt the radio. Here is how to do it.

Turn on the radio, with the antenna hooked up. Never key with out an antenna hooked up.

Set the switch all the way to the left(S/RF SWR CAL) to CAL. this stands for calibrate.

You will notice there is a knob right next to the channel selector knob marked SWR CAL as well. Start with the knob turned all the way to the left.

Put the radio on Channel 20. This is just about the middle of the band.

Key the radio and hold it. While holding the key on the mic, turn the SWR CAL knob up until the needle on the meter hits the mark "CAL". there is a triangle, and a gap in the line. The needle needs to be at the point of the triangle in the gap.

NOW, while still holding the mic key, flip the switch from CAL to SWR. You should see the needle immediately swing back. What ever the needle is on at this point is your SWR reading. use the set of numbers on the top of the meter, that's for SWR measurement.

If the needle does not swing back, and is in the rad, the antenna is WAY off. There are some reference points on the scale. The first gap in the line is 1.5 SWR. if the needle is there or less that is fine. then you have 2 and 3. 2 is not so great, but not extremely bad, but you should try to get it lower. 3 is really bad. Anything past 3 is considered infinity, and is really really bad.

If its high, then your antenna is either too long or too short. So how do you know which?

Here is how.

Turn to channel one and repeat the SWR process from above. Make note of the reading.

Then turn it to channel 40. Repeat the process again and take note of the reading.

Now, if the SWR is higher on channel 40 then 1, then your antenna is too long and you must shorten it. If the reading is higher on 1 then 40, then your antenna is too short, and you must lengthen it.

Make adjustments in length about an 1/8th inch at a time until you have either the same reading on 1 and 40 or real close, and or the reading on channel 20 is really low.

If you get it so that the reading on 1 and 40 are the same, then the SWR reading on 20 will most likely be almost nothing, unless there is either something wrong with the antenna, coax, or its just a crappy antenna.

K40 should be able to get a nice low SWR.

Apr 04, 2010 | Cobra 29 LTD CB Radio

3 Answers

Dont know how to use the swr meter on my radio


With radio turned on

1. Switch the first switch (S/RF SWR CAL) to CAL setting
2. Key mic up &
3. Turn SWR CAL knob while still keying mic until the needle is on the red CAL arrow at the far end of the meter scale. Unkey mic.
4. Switch the first switch back to SWR setting.
5. Key mic up again and record SWR reading and adjust as needed.
6. When done adjusting put switch back in the S/RF setting for normal operation.

Do not flip the switch with the mic keyed up.

Jan 19, 2010 | Cobra 29 LTD CB Radio

1 Answer

Cobra 29 SWR, cal meter


Hello there:
Rule of thumb is go by what the manual tells you. providing it is the manual that is for the radio.. that is why they make manuals for that particular radio a 1-1 to a 1-2 swr rating is really good providing you have no saturation on the internal filter. over saturation due to swr being set too high will eventually burn out the finals of a radio
i have delt with radio's for about 17 years now so i really suggest consult the users manual and always use only a authorized dealer for that particular radio just like my cobra 2000 i am not going to send it to a shop that just does radios i want a authorized cobra dealer ok i hope that this really helps ok please dont forget to give this solution a rate for me it helps me out so i can continue to help out others like yourself.
best regards
MICHAEL

Aug 23, 2009 | Cobra 29 LTD CB Radio

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