Question about Cobra 29 LTD CB Radio

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When i key the mic the antena light comes on what do i. i tried to set the swr but when i switch the switch to swr it still swings the needle clear to the right

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Look at you're ant system..........You have a dead short. Start at the PL 259 connector, check
cable for damage and be sure the antenna is O.K. If this does not fix the problem it has to be inside and will take a tech. at you're end to sort it out.SWometimes it is very dificult to diagnose some of these problems.

Posted on Oct 09, 2010

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1 Answer

Antenna warning light


if you see the red light come on before you even set the swr you already have a problem.set the radio on cal and set the needle at the cal arrow.no unkey the mic . set the meter for swr and key it again.write this # down . go to ch 40 and do the same thing, then go to 19 and repeat. now that you have your readings you need to set the antenna. Now check it again for swr on 1-40-19keep doing this until you get an even reading on those channels.

Oct 14, 2012 | Cobra 29lx Cb Radio W/clock 29 Lx Lcd

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

WHEN I PLUG IN VERY LITTLE RECEPTION WEATHER BAND COMES IN FINE. SIGNAL DOES NOT MOVE EVEN WHEN KEY MIKE, CAN'T SET SWR VERY DIM EVEN WHEN ADJUST DISPLAY


1st. You cannot "set" the swr. The swr is not set on the radio. The antenna must tuned to attain an appropriate SWR reading.

2nd, If this doesn't solve your problem then you could have a worse problem. If there is a problem with the mic such as a break in one of the wires, the radio's receive will be off until you put a good mic on it. Try a different mic, and see if the receive comes back. Then check and see if your transmitting better.

As well, your meter could just be bad, as well your coax or antenna. Your receive could be poor if the antenna is not tuned to lowest SWR.

If it has been working up till recently, and you have "set" the SWR on the radio, which is not what the SWR function is for, because you don't set SWR on the radio, you could have been using the radio with the SWR super high and blown the final or other sections of the radio out.

SWR is basically signal reflection. If the antenna is not the right length, it will reflect energy back into the radio and damage it over time. The more an antenna is off from the correct length, the more reflect you will get.

The meter in the radio is used to determine how much reflect you are getting. You ideally want to have the lowest SWR possible.

To check the SWR, you set the meter switch to CAL. Key the mic. while holding the mic key down, turn the CAL knob up until the needle is at the little triangle at the top right of the meter marked by "CAL", Then while still holding the key, flip the meter switch to SWR. where ever the needle is at that point is your SWR.

You want ch 20 to have the lowest SWR. If the swr reading on channel 40 is higher then channel 1 then your antenna is too long. if it is higher on 1 then 40, its too short. Make small adjustments until 1 has almost the same reading as 40. then check ch 20 and it should be real low.

As I have said, if you haven't tuned your antenna as I have just explained, and have been using it as is, the possibility is high that you have already hurt the radio.

Although it could also have a bad meter. Use an external meter to read the SWR.


Other things to check. Make sure cable connections are tight. Make sure coax is not damaged. try another antenna.

Aug 24, 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

1 Answer

I have cb hooked up to antena and power i think its hooked up right but when i key mic both lights on right hand side of cb turn red . plus when i try to tune swr with the manual the swr needle will not...


Sounds like a problem with your coax cable. You may not have the ends on the cable properly or the cable may have a kink or short in it somewhere. That is a sign of a very high SWR and usually means a short somewhere. If it is a mobile antenna make sure the little plastic washer on the antenna mount is installed properly. It is meant to insulate the antenna center conductor from the metal it is mounted to. It goes on top of the bracket and has a little raised collar on one side which should sit in the hole on the bracket.

Feb 03, 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

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

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

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