Question about Maxon MCB-40 40-Channels Handheld CB Radio

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Maxon Model MCB10A

As confirmation this a mobile hand held transmit/receiver radio with a 3"X 1-1/2" medal box for the antenna and power supply connections. The unit does not transmit but receives fine. The SWR is okay. Trouble shooting suggestions would be appreciated. Don.

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In order to test this unit you will need a power meter with a dummy load. connect the power meter and turn on the unit, key the microphone and look at the power meter it should have a reading of < 4 watts PEP unmodulated and = 4 watts PEP modulated. If you do not have this reading the RF transmitter in the CB might be malfunctioning. You will need a RF generator, a power meter with dummy load, oscilloscope and a multimeter to troubleshoot this problem with. If you do not have or do not know what this equipment is or how it works, please take your unit to a CB repair shop. Thank you, Shuttle83

Posted on Oct 07, 2007


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Posted on Jan 02, 2017


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There are a variety of reasons for your Spectra to fail to transmit. A few items to check would be:
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Not sure what you mean here...

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You may have a bad antenna. What happens is a lot of guys carry their radios around by the antenna, inside the connection to the antenna is weak and can crack at the solder joint, thus opening up the antenna circuit and prevent you from transmitting any power out. Our Motorola hand helds have this problem, they are weak at the antenna connector and guys swing them around by the antenna end up breaking them.
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Meter Shows Signal, no noise

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