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data transmission

data transmission

data transmission

(OP)
I need to send 9600bd data 4km.

RE: data transmission

You can buy a fiber modem to transmit your signal by fiber optics. It is expensive for both fiber modem and optical fiber.

I never tested before but it sounds you can use the RS-485 interface with twist cable to transmite low baud rate to 4KM. You may need some repeaters.

I hope it help

RE: data transmission

Two words, Spread Spectrum. You can get a relativly cheap pair of radios in the ISM spectrum to accomplish this task. Take a look at www.adaptivebroadband.com. I have used their 900Mhz radios in the past for slow speed data and they worked great. Other manufacturers have similar products, do a search and see what comes up.

RE: data transmission

TWO Line Modems can deal with it .
Of course U should add 4KM lines.

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