Question about Cobra 29 LTD CB Radio

1 Answer

When do you know if you have a decent radio

Got a cobra 29 ltd classic. standard cobra mic. stock antenna on a freightliner cascadia. i hear incoming when the needle swings to right half way to full. should i assume that i am being heard just as good based on how i sound from the talk back heard on the external speaker.

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The 29 has a built in SWR meter--check the match to make sure it is below 2 (lower the better).

The radio can be peaked for better than factory audio.

If the squelch is up too high you will not hear people below a certain signal level---in your case set it so you hear who you want to and not jokers.

RF gain lowers signal the radio sees for receive.

The stock mic will work but make your voice somewhat flat sounding---a power mic or having the mod limiter removed will make the radio and your voice louder.

Let me know if questions.

Posted on Jun 11, 2012

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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  • 773 Answers

SOURCE: cobra 29 ltd classic antenna calibration ??

Wow. That's not at all a solution to what this guy is asking. And why all the caps??

The one point jm77437 has that is correct is that you do not set the radio, you set the antenna. The rest is blah blah.

Here is how you tune your antenna for you radio. First off it depends on what kind of antenna you have. most fiberglass antennas have a tunable tip to adjust the height of the antenna. Metal whips either have a collar at the base that the whip will either slide up or down in to adjust the height. The other type of metal whip's you have to physically clip to shorten the antenna, you must be careful with this type because once its clipped, that's it. You cannot add what you cut off.

I am going to give this example using a metal whip with an adjustable collar.

First after your radio is hooked up in the vehicle, drive to an open lot. Buildings and other structures can cause extra reflection. turn to channel 1. Flip the meter to CAL. Key the mic without talking. Now turn the CAL knob up until the needle reaches the little upside down triangle all the way to the right marked CAL. Now you have just celebrated your radio for your setup to measure you SWR. Now while still holding the key, flip the meter switch to SWR. The needle will move, and where it stops is your SWR reading. The lower the better. Anything under 1.5 is considered really good. But still, the lower the better.

Make note of what your SWR was on ch 1.

Now flip to channel 40. Repeat the SWR process. You must recalabrate each time you take a reading.

Now like jm77437 said. If your SWR reading is higher on 40 then 1, then your antenna is too long, and you must make it shorter. Loosen the collar and lower the antenna in the collar 1/4 inch at a time. check the swr each time you adjust the antenna.

If your SWR reading is higher on channel 1, then your antenna is too short. You must make your antenna longer. Do this by loossening the collar and pulling the antenna upward in the collar 1/4 inch at a time, again checking the swr each time you adjust the antenna.

What you want to achieve is having the same SWR reading on channel 1 and 40. then you have the best match you are going to get with that antenna.

If your swr is under 1.5 on all channels, you don't need to fuss unless you are a perfectionist. then by all means go ahead.

If your reading is higher then 3, or your ant light comes on, something is really wrong. Make sure your antenna is connected all the way, and the coax is not damaged.

Its important to have an appropriate SWR because if you do not, you are reflecting too much signal back into the radio, and eventually you will burn out your final transistor, and your radio will be toast.

Some tips: make sure you check the swr with the doors and windows shut. Make sure you are in an open lot. Remember to calabrate ecah time you take a reading. If you have had your radio peaked by a radio shop, and they have lowered your dead key, or have done a swing modification, then the meter in your radio will not work when taking an SWR reading and you will have to use an external meter.

Posted on Apr 24, 2009

Dodgem250
  • 68 Answers

SOURCE: Cobra 29 LTD Classic Operations Manual

For the operation manual, go to cobraelec.com or:

http://cobra.com/downloads/manuals/29LTDCLA.PDF


Thanks!
Dodgem

http://dodgem250.angelfire.com

Posted on May 10, 2008

  • 23 Answers

SOURCE: Cobra 29 ltd classic side mic

First off I dont believe anyone to peek and tune but anyways. Make sure your mike is for the radio wiring. Next the guy that rigged it up might have gave you all the channels do all your knobs work??? usually you can tall as you get someone to talk with you a few blocks away and start, start turning and flipping switches till you can hear him most likely the guy that did the work on it messed it up. for a filter use a farite choke from radioshack on the mike wire.

Posted on Mar 24, 2009

  • 773 Answers

SOURCE: cobra 29 ltd classic antenna calibration ??

You should not calibrate the antenna before you install it on the car!! the antenna needs to be calibrated on the vehicle that it is going to be on. Type of vehicle, different mounts, and many other variables can change the amount of reflection you will get.

j0hn9999 did a much better job but left some info out.

Take your SWR readings on channel 1, then on channel 40.... NOW, if your SWR is higher on ch 40 then ch 1, then your antenna is too long and it needs to be shortened. Refer to the antenna instructions on how to shorten the antenna.

If your SWR is higher on ch 1 then on ch 40 then your antenna is too short. You must lengthen the antenna. Again refer to your antenna instructions on how to lengthen your antenna.

You must calibrate each time you take a reading.

Make sure your doors and windows are shut when taking a reading

Make sure you are in an open lot when taking a reading as buildings, trees and other structures can cause reflection and give you an inaccurate reading.

If you adjust the length of your antenna on another vehicle and then put it on yours, the SWR will be off. It will need to be tuned again.

An external meter is better then the one in the radio, but will need to be hooked up in the vehicle you have the antenna on.

If you are not running any kind of power, or do not have a swing kit installed, and the radio is stock, the meter in the radio is more then enough to get a correct SWR reading.

Posted on Apr 24, 2009

  • 36 Answers

SOURCE: i have a cobra 29 nw ltd classic i cannot hear or be heared

Start with the antenna that you have hooked to it, is it grounded, is the coax in good shape, is the connector in good shape. stuff like that.

Posted on Jun 15, 2009

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1 Answer

My cobra 29 ltd is in a ford truck with a over head camper. i put a magnet mounted wilson 1000 watt ant (4ft.) on top of the cab. I cannot get any squelch to work I did a radio check i believe i was heard...


Assuming you don't have the manual,basic controls for receive are to make sure the switch next to the meter is set to s/rf,switch for cb/pa is set cb,knob for rf gain is at max, squelch knob is fully counterclockwise..squelch can be adjusted if ya don't want to hear static but will start cutting out weaker signals.If none of the above works,try plugging in an external speaker to the jack on the back of the radio,if ya still don't hear anything,check that antenna coax is screwed in tightly in back of the radio.Next step after all that would be the microphone,is the stock mic,power mic..if it is the original stock mic that has not been rewired in any,then I would suggest taking radio to qualified cb repair shop,bring mic with you to shop so they can check it too,in fact I would bring the truck also so they can check antenna and adjust it if needed...Good luck

Sep 04, 2011 | Cobra 29 LTD CB Radio

2 Answers

Cobra 29 ltd Classic no sound, no rx, all lights work rx,tx, lite up. The SWR meter moves when mic is keyed up.


Check speaker and plug external one in if you have it.

swap mic could be a broke wire or bad switch in handset.

check antenna and coax connections.

i know checks sound basic but they could save you a lot of headaches later

May 31, 2011 | Cobra 29 LTD CB Radio

1 Answer

I have a cobra 29 nw ltd classic i cannot hear or be heared


Start with the antenna that you have hooked to it, is it grounded, is the coax in good shape, is the connector in good shape. stuff like that.

Jun 14, 2009 | Cobra 29 LTD CB Radio

1 Answer

Can recieve but not transmit


The mic wires are soldered incorrectly. Get another cobra mic for that radio or have a qualified radio tech correct the wiring.

Apr 15, 2009 | Cobra 29 LTD CB Radio

1 Answer

Cobra 29 ltd classic side mic


First off I dont believe anyone to peek and tune but anyways. Make sure your mike is for the radio wiring. Next the guy that rigged it up might have gave you all the channels do all your knobs work??? usually you can tall as you get someone to talk with you a few blocks away and start, start turning and flipping switches till you can hear him most likely the guy that did the work on it messed it up. for a filter use a farite choke from radioshack on the mike wire.

Mar 17, 2009 | Cobra 29 LTD CB Radio

1 Answer

Cobra 29 LTD Classic not transmitting or receiving


As I understand from a tech friend of mine, most truck beds are not grounded well enough. Perhaps you could borrow/purchase a magnet mount antenna and locate it on the roof, for testing. Then you would have it narrowed down to the location.

Dec 05, 2008 | Cobra 29 LTD CB Radio

1 Answer

New Cobra 29 ltd


Hi,

Appreciate the direct "Ask Me". If I may clear up your concern:
  • you have two CB radios, one is a Cobra 29LTD and the other?
  • both have received and both do not transmit;
  • you have two trucks, one with a Firecracker 1000 antenna, and the other?
In any case and initially, TX (transmit problems) could be caused by:
  • defective PTT/mic;
  • defective finals/drivers;
  • defective PL-259 connector/RG58 Cable;
  • antenna grounding/SWR;
  • other electronics internally
Please check the above. You may need an SWR meter, a watt meter and a DVM/VOM to perform the tests.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information. Good luck and kind regards. Thank you for using FixYa.

Nov 05, 2008 | Cobra 29 LTD CB Radio

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