I recently bought a new cobra 29 nw ltd classic. Calibrated fine, swr is good, red ant light comes on when I key the mike. Receives good, transmits good. I drive a Kenworth T2000, company installed new ants, is it a possible wiring problem in the cab, what will happen if i operate it with the red light coming on? Thanx
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Re: red ant light
You probably do not have a problem at all if the radio has been"tuned up" by clipping the limiter diode. It isn't an uncommon thing to happen if the light just flashes while your modulating, that is probably whats happening.
Well to start with the swr meters on judt about all cb radios are just for reference and do NOT reflect the actual swr reading in your antenna system.If the red antenna warning light is coming on then I would bet you do have a high swr reading. Also the factory coax in big rigs of any make are CRAP!!. I would suggest that you install a new length of coax and it needs to be exactly 18 feet long as this is any antenna manufacturers recommended length. I dont know what year modle KW you drive but I do know from experience the 2007 models do not have a good ground system in them, at least the ones I have worked on. You may also need to ground your antenna brackets to the chassis with a peice of wire, and be sure where you ground it to all the paint must be removed and be bare metal at the point where you run the ground wire to as this will give a positive contact point with the ground. You can install the coax and the gruond yourself more than likely because its not to complicated but you do need to let a cb shop check your swr and set it if needed because he will have a much better swr meter than what is in the radio. The cost for the swr check and set should run somewhere around $ 15- $20.
If your charged more than that you are getteing ripped off by the cb shop. If you have any futher question you can email me at email@example.com and I will be glad to answer any questions you might have.
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I see two possible problems. First, with a magnetic antenna it is difficult to get the proper ground for the antenna. Make sure the magnetic base is clean as well as where you place it. Second, try running your power lead DIRECTLY to the battery and not using the cigarette lighter. Hope it helps.
HELLO STAN FIRST HAS THE RADIO BEEN PEAKED AND TUNED? SECOND IS THE INTERIOR LIGHT IN YOUR PICK UP RIGHT BELOW YOUR ANTENNA,IF SO YOU HAVE A PROBLEM BUT EASY FIX THE WIRING GOING TO THE LIGHT ACTS LIKE AN EXTRA ANTENNA CAUSING YOUR ANTENNA TO RESONATE TO YOUR RADIO CAUSING THE A W I LIGHT TO COME ON MOVE YOU ANTENNA BACK A LITTLE FUTHER AND SHOULD BE GOODif you want to get a bettter antenna get a willson 500 mag mount far better
There are a few different things that can cause this problem.
1: If it is a power microphone (a microphone that requires a battery).
Try replacing the battery.
2: Broken wires that go from the microphone to the plug that plugs into the radio.You can try gently taking the plug apart and inspecting the wires.
If only one has come loose, you can re solder it to the pin it came from. If more than one has come loose, find a wiring schematic for the radio that tells which wire goes to which pin and re solder appropriately.
3:Have the SWR's checked on the antenna. If the SWR's are to high and the radio has been being used in this fashion, it could have burned up the transmit finals in the radio. If this is the case, you will need to take it to a reputable radio repair facility to have fixed.
The calibrate knob only calibrates the radios SWR meter, the owners manual will show you the procedure for that. If your ANT light is coming on, it is telling you that your SWR is to high, and may cause damage to the radio from reflected power. You should purchase an in line meter as the radios internal meter may be somewhat unreliable. You need to tune the antenna to the lowest SWR possible. Typically anything under 2.0:1 is acceptable. Radio Shack sells a meter for about $50, and is pretty accurate. Antenna mounting can also cause high reflection if it is to close to other objects. Google "CB antenna tuning" or read the instruction manual for you antenna, and you should be able to figure out how to properly tune the antenna.
Your SWR is probably NOT fine. You need to use an external meter if you have had work done to the radio. Especially if you have had a swing mod done to the radio. When you do this, the dead key of the radio is lower then the calibration knob on the radio can adjust for. It will always come up lower then it actually is.
Your radio might have been fine before the work was done on it because it was putting out very little power. Now you are most likely putting out 50 watts or more. Big jump from 4 watts.
When your raise the power in a radio, you will notice more when the antenna is not properly tuned.
In most cases with a stock CB, even when the antenna is not even near tuned, you will get a reading less then 1.5 anyway.
the more power you put out, the more important it is to have a good match.
But an external SWR meter, and check it. be careful if the ANT light is on.
You might also want to check your coax, connections to it, and your antenna for anything wrong.
ant. light should only come on if you have a high vswr a bad thing did you check that cb/pa switch is set to cb check your swr this is not a good place to mount ant. as it is close to metal of back of cab
if the red ant light comes on this means that you have antenna trouble either in the antenna itself or the coax but this should not have anything to do with the radio not transmitting. it sounds to me that you have a bad audio chip or a bad power output transistor. in either case you should really take it to a cb shop and let the professionals solve your problem, good luck!!