I have a cobra CB lowest model, 19 i think. i wired to batt. and connected to antenna. nothin. no static, no test, no noise. Speaker fried? should i try a different one? am i overlooking something completely obvious?
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Do you or a friend have a SWR/Power Meter? If the Standing Wave Ratio of the antenna and feedline is to high you will not get the power from the radio to the antenna. You want you SWR to be 1.3 to get a good signal from your antenna. Most antenna have a set screw that is loosened and tightened after either lengthening or shortening the antenna stub.
Sounds like a antenna issue. Make sure coax is in good order.and antenna is connected properly. You might have to get a "swr" meter to put in line between radio and antenna to make sure antenna is "tuned" to were the radio is operating. Radio shack sells a ok low budget swr/power meter.
You should always connect the CB directly to the battery as the accessory socket is full of noise. You also should choose a better antenna as these small glass mounts cannot hear signals well and magnify local noise. AM (CBs) radios naturally pick up noise as it is the nature of AM signals. Use your squelch to lesson this but too much can knock out you reception.
The external speaker jack was not designed for a head set. It has too much power it over loads head set. You need to solder a resistor in line with the negative wire. You will have to experiment to see which value gets the audio just right for the head set you are using.
Sounds as though you may have a poor or bad antennas system. I would suggest to check the antenna match ( SWR, Standing Wave Ratio) and if it's good, you might think about a better antenna. Good Luck