Question about Cobra 29 LTD CB Radio

2 Answers

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

When i key up the mike the rx/tx light and the ant light turn red whats the problem...i am using a brand new antenna

Posted by on

  • 1 more comment 
  • mcolizzi1 Oct 02, 2009

    oh ok well is the ant light supposed to as well...also i can not adjust the swr into range it is too low

  • mcolizzi1 Oct 02, 2009

    oh ok well is the ant light supposed to as well...also i can not adjust the swr into range it is too low

  • captancrunch May 11, 2010

    if i am not mistaking it is supposed to light up red when the mic is keyed up.

×

2 Answers

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that gotĀ 5 achievements.

    Governor:

    An expert whose answer gotĀ voted for 20 times.

    Hot-Shot:

    An expert who has answered 20 questions.

  • Expert
  • 141 Answers

After installing the antenna, follow these steps to adjust the
standing wave ratio(SWR).
1. Turn on the CB.
2. Set S/RF/SWR/CAL to CAL.
3. Key the Mic and rotate SWR CAL so the meter points
to CAL.
4. Unkey Mic.
5. Set S/RF/SWR/CAL to SWR.
6. Key Mic again and note the actual measurement on
the SWR scale. Refer to the following table to interpret
the reading.

1:1 - 1.5 Great
1.5 - 2:1 OK
2:1 - 3:1 Not So Good
Higher than 3.1:1 Terrible

Posted on Jan 30, 2010

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

Your swr setting are off wack fix your swr

Posted on Oct 09, 2009

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

I need wire colors for CB microphone its a TRC


ALTAI PWR MIC - black/braid= earth, red=RX, white=TX, Yellow=MODASTATIC - blue/braid=earth, black=RX, red=TX, white=MOD, Yellow=Spare
SIRTEL ECHO MIC CBE 2002 - black/braid=earth, blue=TX, white=RX, red=MOD007 POWER MIC - brown/braid=earth, green=RX, white=TX, blue=MODSADELTA EC 980 - braid=earth, green=RX, brn=TX, white=MOD
or braid=earth, black=RX, blue=TX, white=MOD

Oct 30, 2016 | Radio Communications

1 Answer

When I key the mike I get the red light.I have a galaxy979 and a no ground ant


there are two lights on the face of that radio near the channel selector.When you turn the radio on the top top light should be a greenish blue until you talk then it should turn red to let you know that you are transmitting . If the light below that one turns red at the same time then you have an antenna problem. Its not a no ground antenna its a no ground plane antenna ,you still have to ground it .

Nov 18, 2015 | Radio Communications

3 Answers

Red lights come on tx n rx and antenna come on when I key up the cb radio and the swr meter doesn't move


if a mod has been done to the cobra 29 (all 29,s)the light will come on just find vr6 audio the radio as it comes on adjust vr6 untill it goes away,,,,always trust your watt meter(s.w.r scale)over the flashing light its really easy to do it beats paying a shop $10-$15

Jan 13, 2013 | Cobra 29 LTD CB Radio

1 Answer

Mirage 88.. RX okay TX distorted


try the original mic . If its still distorted then it,s a radio problem.

Mar 14, 2012 | Galaxy Radios DX- 88HL Base CB Radio

1 Answer

Just bought a cobra ltd crome ive mounted every thing how to i clibrate it with my attenna? when i key up both rx/tx and ant lights up red?????


This is a common misunderstanding when it comes to communications equipment. You don't tune the antenna to the radio, but rather you tune the antenna to the vehicle. the vehicle is the ground plane for your antenna system.

With that said You will need an SWR Meter between your antenna and Radio. follow the instructions for your meter for calibrating the meter and follow the instructions for your antenna for adjusting the length.

Jul 14, 2011 | Cobra 29 LTD CB Radio

1 Answer

When i key in both green lights turn red. is this normal ?


One of the lights is marked RX/TX. This light normally turns red when you press the mike key. The other light indicates a bad SWR if internal circuits are properly aligned. If someone has turned the pot which sets the level at which the light comes on, it may come on when you press the mike key. Check your SWR with an external meter to see if you have problems in the antenna system. The way I set this light in my shop is to put a 150 ohm resistor on the antenna connector and set the control so that the ANT light just comes on.

Jun 15, 2011 | Cobra 29 LTD CB Radio

1 Answer

My rx/tx light is green untill i push on the mike. then the light turns red. and the antenna led theres nothing. whats could be the cause and the fix...and the swr metter goes into the red all the way to...


Its working alright then...what the antenna light is for in case the SWR is too high. If it does not come on---Then it means your antenna works good.

May 16, 2011 | Cobra 29 LTD CB Radio

1 Answer

Every time I press my MIC to speak into it the red lights on the RX/T and ANT light come on alerting me of a problem. How can I fix this.


RX/TX light should change to red, however the ANT light is a bad light. This means that your antenna is not adjusted properly. Do not key the radio or talk on it for any other reason then to check the SWR and tune the antenna. If you have the manual that came with your cobra 29, there is a section that explains how to check the SWR. And the manual for the antenna, it will explain how to adjust it.

If not, here is how to do it.........

How to check the SWR on a Cobra 29

Step 1. Find out what your current SWR is on the center of the band.

  1. Turn the radio to channel 20.
  2. Set the S/RF SWR CAL switch to CAL.
  3. Turn the CAL knob all the way counter clockwise.
  4. Key the radio. Do not talk into the mic.
  5. While holding the mic key, turn the CAL knob to the right until the needle reaches the CAL mark on the top right of the meter.
  6. Now flip the S/RF SWR CAL switch to SWR while still holding the key on the mic.
The needle should fall. Where ever the needle is while holding the key is your SWR reading on channel 20. It should be as low as possible. If its a reading of 2, then its not gonna kill the radio but is border line. Any higher and its bad. Using the radio like this will damage the final output transistor. If its less then 2 this is better. You want it to be less then 1.5 or better.

The ANT light may come on with an SWR of 2. running the radio with an SWR of 2 shouldn't hurt the radio, but I don't like to mess around. Get it as low as possible.

How to adjust the antenna for SWR

The length of your antenna will change your SWR. SWR is basically how much RF energy is not leaving the antenna and getting reflected back into the radio. That's why it hurts the radio when its high. An antenna has to be the right length, matching the length of the radio waves in order for it to radiate all of the RF energy out of the antenna.

Most antennas have a way of lengthening or shortening the antenna. If its a mag mount antenna with a metal whip, there is probably a set screw that when loosened, will allow you to raise or lower the whip. If its a fiberglass antenna, under the rubber cap at the top is how you raise or lower the antenna.

Figuring out if your antenna is too long, or too short

Here is how to know weather or not you have to lengthen or shorten your antenna.

  1. Take an SWR reading as explained in the first step on channel 1. Write down the SWR for reference.
  2. Take another SWR reading on channel 40. Again write it down for reference.
Now if the SWR is higher on channel 1 then on channel 40, its too short. You need to make it longer.

If the SWR is higher on channel 40 then channel 1, then the antenna is too long. You need to shorten it.


Make small adjust ments about an 1/8th to a 1/4th inch at a time. each time checking the difference between channel 1 and 40.

You will know when you are a good match when there is little to no difference between channel 1 and 40's SWR. Once you are satisfied that the difference between 1 and 40 is about the same, and much lower, then turn the radio back to channel 20 and take an SWR reading.

You will now find that the SWR on channel 20 is really low. Most likely under 1.5 or better, Almost nothing on the meter.


Here is a Meter Key, so you know what you are looking at.
2d03348.jpg

Oct 11, 2010 | Cobra 29 LTD CB Radio

1 Answer

Red RX/TX and red ANT light on my CB


Well,first hand ,some cobra radio,s have red some have green RX/TX lights, but are you modulating? Some green lights turn red. What is your standing Wave on the antenna,s? You need to check it and the output of the radio. To do this you need a watt or field strenth meter. Can get one at Radio Shack. Your standing Wave is ok as long as it is below a 2. That has to be done on the antenna. ..hope this helps...

Mar 11, 2010 | Cobra 29 LTD CB Radio

1 Answer

When i key up yhe mike i get a red light at the tx/rx. what does this mean ?


Here's the link to download the manual if you don't have it:
Ranger manual
I suspect however, that the absence of the green LED, the red probably is a warning about excessive VSWR which can damage the output section of the radio; you need a better antenna match.

Oct 24, 2009 | Ranger Communications RCI-6900F-25 CB...

Not finding what you are looking for?
Cobra 29 LTD CB Radio Logo

Related Topics:

979 people viewed this question

Ask a Question

Usually answered in minutes!

Top Cobra Radio Communications Experts

AnyMHz.com
AnyMHz.com

Level 2 Expert

500 Answers

Steve

Level 3 Expert

3287 Answers

Brad Brown

Level 3 Expert

15557 Answers

Are you a Cobra Radio Communication Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...