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Not able to transmit or recieve on cb radio in car

I have an old magnetic mount antenna connected to a newer 40 channel CB radio. I don't hear any radio traffic on it. I have not had a CB in my pick-up for many years. but now am getting ready to go cross country on vacation. I seems that I am neither transmitting or recieving. I tried a radio check and no one answered back. Is it possible that the antenna is bad. The radio i have is almost new (i bought it in 2004) just never installed it.

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Its a broken connection in the antenna coax :(

Posted on Jan 30, 2010

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It could be your ant. a broken coax wire or a bad ground could cause this a could a broken or shorted wire on your mic.

Posted on Jun 03, 2009

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1 Answer

Do i need a certain antenna?


The fiberglass provides no ground plane area for the antenna and radio waves. Your Standing waves (aka: SWR or Reflect) are probably very high. I suggest mounting the antenna on the cab of the truck. You "could" try aluminum tape on the cap and mount the sheilded side of the coax to it somehow. Without a ground plane much of the RF Power of you CB will be reflected back to the Final Output Transistor(s) (Final or Finals), overheat it and possibly damage and burn it/them out. If you are just running the CB without an amplifier(Linear or sometimes called a box), a magnetic mount antenna should work fine and be less of a problem than permanently mounted antennas. That's a plus when going into a parking garage. Even if you decice to get an amplifier at a later date, you should be able to use it with the magnetic mount antenna as long as the antenna you but is rated for several hundred watts, you Standing Waves are Low, and the amplifier doesn't put out more power than the antenna is rated for. I hope this helps.

Apr 17, 2014 | Midland 1001Z 40-Channels Base CB Radio

1 Answer

Radio recieving and putting very poor.


Just because its a magnet mount doesn't mean its a 100%. I've sold 4 little wheels made by wilson in the past 2 months and they had a ground problem. If you grab the base of the antenna does it give you more squesh? If so it has a ground problem. Have you had that antenna matched to you truck if not that could be your problem. You need to have your SWR checked on your antenna.

Jul 13, 2010 | Galaxy Radios DX-33HML 40-Channels Base CB...

4 Answers

Have not used my cobra for some time ...sine someone need my K40 antennae more than me. Just put it back in service with a new magnet mount 36 inch - can send and receive in USB and LSB ....can here in the...


Center the antenna on the vehicle, then check the SWR on channel 1 and channel 40.
with the switch in CAL position, key radio and use the swr/cal knob to set the meter so the needle is just touching the end of the red area on the right-hand side of the meter.
Once calibrated, unkey and switch the switch to SWR and key up again. The lower the reading, the better. If the SWR is Higher on 40, the antenna needs to be shorter.. if its higher on 1, then the antenna needs to be longer.

if it dont transmit period on AM, then there's an internal glitch :)

Jan 24, 2010 | Cobra 148 GTL 120-Channels Base CB Radio

3 Answers

How do i install a cb radio on a pick up truck


You will need a CB radio antenna, The CB radio and mounting hardware as well as the power wire.

Choose a place to mount the radio. Mount it. Run the power wires from the radio to the fuse box. Put red wire in with the fuse that is hooked to switched 12 volt. Ground the black wire to any metal of the vehicle.

Next find a place to mount the antenna. If you use a mag mount, the roof of the cab is a best bet. Run the wire into the vehicle, it can go through the door, just make sure its not going to get pinched.

Hook the coax from the antenna to the radio

Now you have to tune the antenna. this is important because if you don't you you will blow the transmit final transistor out in the radio.

This link will take you to an article that will explain how to tune your antenna.

Nov 04, 2009 | Cobra 25 LTD 40-Channels Base CB Radio

1 Answer

Transmitting problem on motorcycle


  • Make sure you run the CB directly to the battery. What you are hearing is the alternator whining. Even then sometimes a low pass filter may be necessary. Make sure the chassis of your CB is grounded with a copper braid strap too.

  • Hope this helps.

Apr 27, 2009 | Midland 75-822 40-Channels Handheld CB...

1 Answer

Cant transmit out


Not really enough info to help you, but you MUST check the SWR of your antenna system. I've seen many cases where the antenna studs were incorrectly installed, shorting the antennas to ground. Also, make sure the Dynamike control on the CB radio is turned fully clockwise.

Aug 23, 2008 | Cobra 25 LTD 40-Channels Base CB Radio

1 Answer

Matching c b antenna with c b radio


here is some information that will help you test SWR with an inline watt meter. To get proper results you need to use an inline watt meter. Here is a really good site you can go to for help www.cbradiotalk.com

Equipment needed: SWR meter, short jumper coax 3 foot.
midland.jpgProcedure: The SWR meter needs to be placed in line between the antenna and the CB. Connect the antenna (normally connected to the back of the CB ) to the connector marked "Antenna" or "Ant" on your SWR Meter. Connect one end of the short jumper coax to the "transmit" or "Xmit" on the SWR meter. Connect the other end of your jumper coax to the CB.
Assuming you have a standard SWR meter the switches should read as follows: REF or SWR, FWD, and there should be a slide switch marked "set" or "Adjust". If different consult your meter's owners manual.
With the radio on the lowest channel (1 on CB) and the SWR meters switch in the Forward (FWD) position, depress the transmit switch (key up) located on the microphone. While holding the unit in this transmit mode, adjust the meter needle to the set position using the Set or Adjust knob on the meter. As soon as the needle is in alignment with the corresponding mark on the meter face, flip the switch to the Reference (REF) position. The meter is now showing your SWR on channel one. Note the value and quickly release the microphone switch. Record this reading.
Repeat the previous step on channels 19 and 40.
How to read your results: If SWR on channels 1, 19 & 40 is below 2.0, your radio can be operated safely.
If SWR on all channels is above 2.0 but not in the "red zone" (normally over 3.0), you may be experiencing coaxial cable reaction (bad quality, wrong length, etc.), insufficient ground plane, or have an ungrounded antenna mount.
If SWR is in the "red zone" on all channels, you probably have an electrical short in your coax connectors, or your mounting stud was installed incorrectly and is shorted. Do not operate your radio until the problem is found, serious damage can occur to your radio.
If SWR on the lowest channel is higher than it is on the highest channel, your antenna system appears to be electrically short. Your antenna length may need to be increased.
If the SWR on channel 40 is greater than that on channel 1, your antenna is considered to be "LONG" and reduction of physical height and/or conductor length will correct this situation.


Aug 01, 2008 | Cobra 29 WX NW ST 40-Channels Base CB...

2 Answers

Galaxy DX959 CB radio reception and broadcast


You Need to check and set you SWR on the antenna system. You may also have a bad coax or the ant studs ( mounting hardward ) for the antennas may be bad. It definally sounds like an ant/coax problem Good Luck
Ed
NC Electronic
Mills, Wyoming

Dec 08, 2007 | Cobra 18 WX ST II 40-Channels Base CB...

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