Question about Cobra 18 WX ST 40-Channels Base CB Radio
When i key up the tx lites wont come on and i have no audio output.
i have checked-mic-antenna-coax. the problem is inside of radio,what do i need to check? i have ohm meters an modulation-swr-power meters
Take the cover off, flip it over solder side up, check all solder joints for cracks, cold solder joints, check the safety diode where it comes in the radio, before I go further, can you pick up the weather channel?...Does the PA work?...need to check the pre-driver and finals,audio chip, hook up the power meter using a coax three foot jumper from the output from radio to the input of the watt meter, then the antenna, first check the SWR, on the scale on the meter to cal/swr mode,adjust it to spec, then while still keyed down turn the dial to SWR,if it is the safe range your ok,then turn the Dial to 10 or 20 watt scale and key the mic. Does it have any wattage? If not suspect the finals, they are located on the back rail, if it does have RF then its the audio chip, its located on the right side rail facing you,closest to you.remove it and replace it with same ....hope this helps....
Posted on May 21, 2010
I have a Cobra 18 wx st. I am not able to transmit anything on it. I have checked the antenna cables and and all external connections. I receive all the wb just fine but the CB gives me nothing. I tried a different mic and got the same result except when I turn the squelch all the way down and a little above its makes a weird noise. When i press the call button with both mics the TX and the RX lights come on but the power bar shows nothing. Any ideas?
Posted on Jul 06, 2010
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