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Broadcasting a radio frequency

post #1 of 7
Thread Starter 
I just opened up a drive in movie theatre in Ocala Florida and we have complaints of choppy audio near the back of our theatre our radio transmitter is on the roof on the tallest building any idea why the people in the back has their audio cut in and out? We have over 500 cars a night fyi


I also know this is or computer audio but if anyone knows it's the amazing community base at overclock that's helped me so many times. Before
Edited by ZyltadoR - 7/30/11 at 7:28pm
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post #2 of 7
How powerful is the transmitter, what kind of antenna is being used, and how far away are those cars from the transmitter?
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post #3 of 7
Thread Starter 
Hold on a few minutes I'll go find out.

It is a digital fm stereo transmitter kit

Synthesized 87.9 to 108.1 mhZ for no frequency drift.

Ramseykits.con possible product code FM30B

Antenna is about a foot long and similar to a house radio.

The cars experiencing problems are about 100 yds away.
Edited by ZyltadoR - 7/30/11 at 7:40pm
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post #4 of 7
Oh and one last thing - what frequency, and AM or FM?
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post #5 of 7
Thread Starter 
FM currently set to 89.9
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post #6 of 7
Ok first off, I suggest looking into your local and FCC broadcasting laws if you don't know them already - there's usually a limit set on how strong a signal you can put out before requiring a license, and difference license classes, and a whole bunch of stuff. If you increase the power of the transmitter too much it might be illegal.

Now, the transmitter you're using has an output of up to 25mW, which should be good for around 650ft, so I'm pretty sure that your problem here is from the antenna. If it's pretty much the same as a home radio antenna then I'm betting that it's no good for the job. The antenna's impedence should match the transmitter's output stage, and if it doesn't then it causes internal signal reflections and loss of range.

And of course, make sure that there's a clear line of sight between the antenna and the cars: FM hates to travel through walls.
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post #7 of 7
Thread Starter 
Thanks a lot I will keep this information In mind when I gO to work On it tommorow.
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