Question about Connex 3300 240-Channels Base CB Radio

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My radio i can key up the light changes but

My radio i can key up the light changes but cannot rec or transmit cb shop said that my board was bad an connex does not sell parts to send radio to connex for repair its 3300 hp over a year old

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First off you can by any radio parts that you need and any good CB shop knows that.But if its only a little over a year old then you can send it back to factory and it'll be fixed free. There is a serial number on the back of the radio the first to digits is the year and the second two the month it was made so is a year or a little over a year old if so call 1-814-898-1046.

Posted on Jul 14, 2010

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Posted on Jan 02, 2017

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it could be several things......the rf final,bad mic,cold solder joint on the circuit board just to name a few.my suggestion is to find a good local cb shop,if no local shop find one along the interstate hwy most of the time they are located around or near some of the larger truck stops. tell the tech there what the problem is and go from there. good luck !!

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My connex cx3300hp wont transmit


You need external watt meter& SWR meter..Change antenna..Is the radio meter keying 3/4 way up to 4 watts?(if not then its not Tx'ng)It could be 10.240 mhz crystal or IF pots(need Frequency counter) Or take it to professional Cb repairmen...

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Key to tx-green lite out-no output power or red lite rec ok


It could be small transistors--in the back where the light and transmit hook up. One small transistor will shut down transmit & possibly receive. Get it serviced at a radio repair shop. if you know how do it yourself. Change all small transistors to 2sc3904 or 2sc 3906 at "Radio Shack."

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1 Answer

Cobra 150 Lights up,and receives but does not


I know this is going to sound stupid but if you hit or should I say tap ot it will it transmit. If so then you have a bad soilder some where on the board if not its probably your voltage regulator gone bad.

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Just want to know if i should use my ll203 amp in am or ssb mode when running with a cobra CB radio?


What radio?? Does it have single side band(SSB)? If not, then don't use SSB.

AM - amplitude modulation
SSB - single side band.

If you have SSB, there would be a switch on it to transmit in SSB. If not, it is AM only.

Second, Has this radio been worked on to be able to run on an amp? If not, you will blow the amp.

A CB radio transmits dead keys with 4 watts of power, and transmits with 4 watts of audio.

a 4 watt dead key is too much for a linear amp. You will smoke the transistors. Also, 4 watts of audio is not enough to drive it properly. You won't get full power.

The dead key needs to be around 2 to 2 -1/2 watts,or what ever makes the linear dead key half its peak wattage., and the modulation (audio) turned up all the way.

It doesn't sound like you know too much about CB radio's. Not a big deal, you can learn. For right now you may want to take it to a cb shop and tell them you want a peak and tune, and set up to run a linear.

You can find CB shops usually at truck stops. Some area's they are other places. Check the internet for local shops.

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1 Answer

Cobra 29GTL Won't Transmit


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!!

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