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I figured you people could help me ?

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  • 12-05-2007 10:18pm
    #1
    StephenC_IRL
    Closed Accounts Posts: 438 ✭✭


    I need a soloution. So I want to send some data, in ASCII format over say RS232 serial, I need to send it between 1 and 2 kilometers not line of sight really, I was thinking cb or something, it doesnt need to be fast (5kbps is alright)


    Does anyone know of a protable rs232 transciever that opperates on a licence free band in this computer


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    #2
    RoundyMooney
    Closed Accounts Posts: 10,910 ✭✭✭✭RoundyMooney


    RTTY?

    There are a couple of amateurs who frequent here, and will probably have a better idea than me.

    Any ideas, folks?


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    #3
    watty
    Registered Users Posts: 32,417 ✭✭✭✭watty


    433MHz Licence free modules come in 1200bps 1km or 9,600bps 500m versions that take TTL serial (adapting to PC RS323 is simple).

    With a couple of 70cm band Yagi you should get 2km. I don't know it that is legal or not. There may be an ERP limit.

    WiFi will do 5km to 8km (2420MHz) on a pair of MMDS style dishes. Dlink have a dedicated WiFi Bridge which is reverse SMA, then use a reverse SMA to N-Female for the cable tail on the mesh dish.

    Weather proof box and run CAT5 up to chimney.

    You don't want RTTY, It's only 5 bits or so and 75 baud!

    You can also buy comercial outdoor boxes on the Licence free 864Mhz band that do RS232.

    Both the 433 and 864 are one way. If you need two way then use both solutions as the 864 & 433 MHz are easily filtered. You can't do two way full duplex on either channel on its own.

    The 2.4GHz doesn't need "real" LOS for 2km. I've used a pair of video senders on MMDS dishes with no additional amplifier for 6km with no TX visible.


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