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Author
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Topic: Maximizing FM Modulator range
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Jack Ondracek
Film God
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Posts: 2348
From: Port Orchard, WA, USA
Registered: Oct 2002
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posted 10-04-2006 12:03 PM
The simple fix is to just walk around with your modulator, and get what signal you have into the area you really need it.
If you have time to play, here are a couple other suggestions:
Assuming the modulator is working properly and puts out enough power for your application, take a look at your antenna. You need one that is rated for the output impedance of the modulator (75 or 50 ohms). A 75 ohm antenna will usually have a coax fitting that looks like the end of a TV cable. Coax wire is also built for one impedance or the other. To start, match the antenna, coax and connector to the output jack on your modulator. Avoid using adapters to make one kind work with another. You'll lose some power if you do.
If your antenna isn't at the modulator, try not to use a lot of coax. You probably don't have a lot of power to start with, and you'll lose some of it in the wire. Some antennas are "wideband", so you don't have to worry about tuning. Others may require the use of a SWR meter, so you can make sure they're putting out as much power as they can, and not just reflecting a bunch of it back to the modulator.
In the end though, don't be surprised if your building just isn't compatible with the amount of power your Marble box is putting out. To get a signal throughout the building, you may need more power, additional transmitters, a different antenna or some other creative idea.
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