Question about Radio Shack TRC-503 CB Radio

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Keying the mike

Hello ! I HAVE A MIDLAND CB RADIO IN A TRACTOR WITH A MAGMOUNT ON THE ROOF. WHEN PEOPLE ARE ON THEIR SPEAKING THE TX BAR MOVES UP TO 8 DIGITS BUT WHEN I KEY THE MIKE MY TX DIGITS ONLY MOVES UP TO 3 OR 4 . I HAVE DISCONECTED THE AIREAL FROM THE BACK OF THE CB THEN KEYED THE MIKE AND IT MOVES TO 8 BUT JUST NOT WHEN THE AIREAL IS IN THE BACK ( WHAT IS THE PROBLEM ????????????

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Hello Adam, first off, do not unhook the antenna then key the mic; you run the risk of blowing the final transistor out of the radio, then it will not TX.
The digital TX lights can be adjusted high or low by a cb tech. All they are is a general reference as to how much power is being dead keyed; usually around 4 watts.
For the best performance, the antenna needs to have the SWR set with a meter so all your signals are getting in and out. A mismatched antenna system can lose you about half of your power and range; and that's hard on the radio also.
If your radio was tuned up by a shop tech, you would see the digital go part way up, but when you talked into the mic, the digital would go almost all the way up. I hope this clarified the situation for you,,, Let me know,,, Mechanic

Posted on Nov 01, 2008

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