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Getting better FM radio signal

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Im having trouble picking up the local fm radio signals in some of our farm equipment. Our personal vehicles get the local stations no problem and even the odd tractor can pick it up. I'm assuming its either the radio unit itself or the antenna. anyone got any ideas?

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Which pieces of equipment. Are the gas engines. Previous experience on mining equipment has shown that antennae location is really important. It should be on the highest part of the machine. You might have to try a different style on antennae also.

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check antenna and cable to radio. might be broke or cut. if cut, could be shorting antenna to ground. antenna has to be ungrounded on center conductor of cable, outside shield has to be grounded. ohmmeter is about only way to check and see if center conductor is not broken. on connector to radio, make sure it hasn't come apart or is damaged. some radios have a tuning screw for the antenna. not sure what radios you have so can't tell you much on that. some radios screw is on back, others if they have a cassette deck, screw is seen looking in the cassette deck door and it normally hides in the rear of the deck. hope this helps.

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check antenna and cable to radio. might be broke or cut. if cut, could be shorting antenna to ground. antenna has to be ungrounded on center conductor of cable, outside shield has to be grounded. ohmmeter is about only way to check and see if center conductor is not broken. on connector to radio, make sure it hasn't come apart or is damaged. some radios have a tuning screw for the antenna. not sure what radios you have so can't tell you much on that. some radios screw is on back, others if they have a cassette deck, screw is seen looking in the cassette deck door and it normally hides in the rear of the deck. hope this helps.

This right here.

Many of the newer pieces of machinery have the antenna mounted into fiberglass body parts, and they aren't grounded worth a crap.

Many semi's have this too.....end up adding a grounding cable off the antenna to a good, known ground.

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