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My TrueTone 23 channel CB won't power on when I plug it in to my truck. Everything seems to be connected properly. How do I fix this?

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First check to see if the power cable wire is indeed working.make sure the fuse in the fuse holder isn't burnt . make sure there is power to where your wires are connected , fuse box or cigarette lighter plug .If there is power going to the radio then you need a volt ohm meter . You may have a burnt out reverse polarity diode . It is located where the power cord comes into the radio from the inside. It should be the only diode there but just in case check them to make sure it is a barrel shaped black diode. If it is burnt replace it and your radio should come on.

Posted on Apr 15, 2015


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Add channels to a to make it 40 channels or a web page thanks happy happy knew year and healty

I\'m assuming you\'re talking about converting an old 23-channel CB to a 40-channel radio.

You didn\'t specify what kind of CB you have so it\'s impossible to say for sure, but it\'s highly unlikely that this can be done cost effectively.

Most 23-channel radios used a set of 14 (6 base + 4 transmit + 4 receive) crystals whose frequencies were added together to result in the specific CB channel you were wishing to use.

Adding additional channels would require multiple sets of crystals and a replacement of the front-panel switch assembly that selected them.

This is a lot of work and expense, and you would be left with a radio that would either be missing channels - due to the peculiarities of CB channel assignments - or would include frequencies that you\'re not allowed to use. In either case such a heavily-modified radio would likely be illegal to operate.

Most - if not all - 40 channel radios use a newer digital synthesis technique to generate the frequencies needed, so their circuitry is much simpler and less expensive to manufacture. If you\'re wanting 40 channels, it\'s time to put the old 23-er out to pasture and buy a new one. Amazon has basic models starting at under $40.

Jan 02, 2015 | Radio Communications

1 Answer

Diagram setting up cb radio in house

That depends on your power source and what type of antennae you're using. Can you tell us if your antennae is a mobile antennae or a home/base station antennae? What is your power source, a car battery or a 120 volt AC to 12 volt DC converter? More info is good.

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1 Answer

Lookin for info on midland cb 13-830 and 77-824

Both radios are AM only, the 13-830 is 23 channel and the 77-824 is 40 channels. Of the two the older 23 channels is a better radio and is able of more frequencies.

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1 Answer

An old cobra 29 23 channel Cb that has no audio or key up

This is a typical indication of the finals being blown. Probably have to take it to a shop, but it would be expensive compared to the value of the radio

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1 Answer

Where do the 3 wires in back of my Cobra18wxst11 go? Can I use a cigarette lighter plug?


"Where do I connect the three power wires? (radios with 3 power leads)
Answer: Connect the black wire to chassis ground.

Connect the red wire to a switched +12 volt source, such as the fuse for the AM/FM radio.

The orange wire is for the memory retention of your CB radio, and should be connected to a constant +12 volt source. The fuse for the brake lights is usually a good choice.

With the radio wired as above, the radio will turn off when the ignition is turned off. The orange wire will provide power to the radio so that it remembers the channel.

If you are installing your Cobra CB radio in an application where you wish to utilize a cigarette plug to power the unit, connect the black wire to the negative lead (side terminal) on the plug. Connect both the red and orange wires together to the positive lead (center tip) of the plug. Your unit will function properly this way but will not retain the channel memory. When power is applied your radio will come up on channel 9."

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Cobra 75 wx st everything seems to work eccept receiving signal meter will spike on trx and it seems to receive but no sound there is sound in wx mode

WX is for weather. If you put it on WX, and you do not hear anything, then you need to change the weather station it is on. in wx mode, you change weather channels by pressing channel up and down. To communicate with 2 way, press the cb/wx button so it is on CB mode.

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Cobra gtl 148 seems to have no power til i push on mic connecter.

cobra 148 shows no wattage output on external meter but does show good modulation.

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1 Answer

Wont change channels

First, try resetting the faceplate CPU by shorting the proper pins on the faceplate to radio connector on the back of the faceplate with a piece of wire... They are marked on the connector, if this fixes it for you, enjoy!

If that doesn't work, then remove the back cover of the faceplate and check the faceplate connector itself for bad solder joints. As a matter of fact, check the entire radio for bad solder joints before looking any further.

I bought one of these radios a short time ago; Everything worked except for LSB.

I was told by the radio shop I bought it from that I'd have to wait until June to get it fixed, so I opened it up myself to see if it was something easy to find/fix, since I felt that if it was anything major it wouldn't be able to get AM or USB either.

In my case, I found bad solder joints on the faceplate connectors and a bad solder joint on one of transistors attached to the heatsink.

Once I fixed those two things, it's been a great little radio.

Be sure to reset the faeplate after resoldering and assembling, to clear any errors from the CPU.

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1 Answer

I can't pick up anything...

Hello even though everything is connected properly, have you checked for standing waves on the antenna to radio connection? Also you may have to perform a sensitivity test on the unit. The problem is you need a RF generator for that. Set you RF generator to the frequency that is equal to the CBs middle frequency and modulate the CW with 1KHz at 50% modulation, tune to the middle of the CB band on the radio and set the output of the RF generator to .1uv and loosely couple the signal to the CB antenna with a loop of wire. Your CB should be picking up a 1KHz tone gradually turn the power level down and when the tone cuts off that level is cutoff level, then increase the level until you can hear the tone again when the tone cuts on that value is the sensitivity of the unit. Compare the measured value to the value in the owners documentation. if the sensitivity is low this could denot a problem in the RF/IF section of the CB.

Oct 04, 2007 | Uniden Bearcat Pro PC68LTW 40-Channels...

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