Question about Cobra 29 LTD CB Radio

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Cb radio why does my antenna light com on everytime i key up my mic

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Most of the time this indicates a bad swr. You may have a poor ground or a bad cable. See more about swr here:
http://en.wikipedia.org/wiki/Standing_wave_ratio

You may need to lengthen or shorten the antenna but you should have a swr meter to do this in the frequency you are testing. At radio shack they should have one for cb.


Hope this helped

You should refrain from transmitting until you get the swr down to about 1.2:1 or close.

Kevin

Posted on Apr 12, 2008

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1 Answer

RED SWR ALERT LIGHT COMES ON WHEN I KEY UP


In most cases if the mic works the common cause is the transmitter in the mother board is shorting out or not soldered to the board properly. another cause could be that your antenna is too close to the CB and will disrupt the signal.

Oct 14, 2012 | Galaxy Radios DX-959 40-Channels Base CB...

1 Answer

It has a great dead key but when I key up you can barely hear me talk. even with he mic gain turned all the way up


  • Hi, I can help.

  • If you have confirmed your dead key being "great" the the two things that can be causing your problem is a faulty mic, mic wiring, mic connector (either on the CB i=or the mic connector itself.
  • Have you tried a different mic?

  • The other thing would be a bad antenna, antenna connection, SWR.
  • Have you tried a different antenna? Checked your SWR (with an inline meter)? Make sure the antenna connector (PL259) and the connector for the antenna on your CB (SO239) are in good condition and that there are no cold soldier joints.

  • If you have any comments please feel free to leave them here.
  • Hope this helps and thanks for using FixYa.

Regards, Tony

Sep 14, 2011 | 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

With key on in acessary radio works [no antenna light when mic keyed up] with truck running antenna light on when key up mic


Wire the radio directly to the battery with extra heavy duty wire. Watch the polarity and try to run the leads away from the fuse box and route the antenna in a different spot on the truck....

Mar 06, 2010 | Cobra 29 LTD CB Radio

2 Answers

Tunning the antenna on radio shack cb trc-447


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

The ideal standing wave ratio (SWR) is 1:1, or a meter
reading of 1 on the SWR meter's top scale. A SWR ratio
of 1.5:1 to 2:1 is excellent for most mobile CB antenna
applications.

Check the SWR on Channel 1 and Channel 40
If the SWR is higher on 1, make the antenna longer
If the SWR is higher on 40, make the antenna shorter
Most antenna's are adjustable. Make small adjustments at a time.

Oct 10, 2009 | Radio Shack TRC-447 CB Radio

2 Answers

After keying antena lite stays on have to turn radio off to clear


Make sure your antenna is tuned properly. The light comes on when the SWR is too high. This damages the final transmission transistor. You can blow the transmit in the radio.

If you need to tune your antenna and do not know now, go here and follow the instructions...

tune SWR

there could already be some damage to the final transistor already, it may be why the light stays on. Tune the antenna according to the article and then if the light stays on again, there may be something wrong with the radio, or the warning light is not adjusted correctly.

If your swr is okay, then turn vr6 all the way down so the light does not come on.

Oct 02, 2009 | Cobra 29 LTD CB Radio

2 Answers

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


your swr setting are off wack fix your swr

Oct 02, 2009 | Cobra 29 LTD CB Radio

2 Answers

Cobra NW LTD CB radio


start out by getting a good antenna like a wilson or k-40 if your using it on a big rig make sure its a metal mirror and door a lot of big rigs use fiberglass and thats a nono you must get a no ground plane antenna...its all in the antenna...good luck doc's cb shop ny

Apr 09, 2008 | Cobra 29 NW CB Radio

5 Answers

Matching Antenna, or ??????


If the antenna is tunable, you definitely need to start out by having the swr set properly on the antenna. Also, make sure the plastic ferrel, (the small round white piece) is between the top of the antenna bracked and the antenna itself. It is there to make sure the antenna does not ground out to the vehicle. If the antenna is grounding out, it will be like no antenna at all. I have also had a few customers that have had broken coaxes straight out of the factory package on cheaper antenna setups.

Dean
Rollin CBs

Feb 08, 2007 | Uniden Bearcat Pro PC78LTW 40-Channels...

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