Question about Icom ICM422 FixedMount Marine VHF Radio (White) ()

1 Answer

Radio not transmitting

Radio has power and recieves transmissions. However when I transmitt, the TX indicator goes on but the transmission does not happen. this was intermittent but is now constant. Could the problem be in the co-ax connection?

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Yes it can be. Check the connector on the back of the radio and make sure it is a solder type connector. The connectors that are twisted together never work well. The shield of the coax needs to be soldered to the outside of the connector and the inner portion needs to be soldered to the center.

There also could be a problem with the radio so if that doesn't work I would recommend taking it to a marine electronics dealer for them to test the radio.

Posted on Jun 14, 2010

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Posted on Jan 02, 2017

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##0281 [Tx] at time of transmission, the procedural signal has been transmitted more than
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##0282 [Tx] at time of transmission, the procedural signal has been transmitted more than
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##0283 [Tx] at time of transmission, the procedural signal has been transmitted more than
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##0284 [Tx] at time of transmission, DCN is received after transmission of TCF.
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##0286 [Tx] at time of transmission, DCN is received after transmission of EOM.
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##0290 [Tx] after transmission of MPS, a signal other than PIN, PIP, MCF, RTP, or RTN has
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My cobra 29ltd cb radio will power on and recieve but will not transmitt. the transmitt light lights up but the meter will not move. what can I check?


I am assuming you have called out for a radio check and not gotten a reply, or even better tested it with friends radio. Just because the meter doesn't mover doesn't mean that its not transmitting.

So as long as you tested it with another radio, and it is not transmitting it could be any number of things. If you have never had antenna tuned so the swr is low, or your swr was high for a long time, your final transistor is most likely blown.

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1 Answer

Cant hear


Several things can cause poor reception. I have a few questions for you.

1. Have you tried measuring your SWR (standing wave ratio)? This helps give you an idea how well your transmission line and antenna are working.
2. Is this radio being used as a base or mobile? Do you have proper grounding on the antenna?
3. Pressing the mic button and seeing the radio indicate "transmit" does not always mean you are transmitting at full rated power. Have you tried transmitting through a wattmetter into a dummy load?
4. If the transmission line is good and the antenna is good, then I would suspect that something may be wrond with the receiver's front-end (sensitivity).

Receiver sensitivity can be checked by using a RF signal generator. Unfortunately you'll have to take the unit to a repair shop to have that checked. Try the other things I mentioned above. Let me know what you find and we'll go from there.

Good luck,

- Jim

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