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Topic: Need a 1KM range RF module for arduino (Read 2976 times) previous topic - next topic

s_premkumar999

Hello Experts...  :)
I want to send Some ASCII characters with an RF link over 1KM range with Arduino, I found a transmitter here (http://www.nskelectronics.in/rf_tx__rx.html) is this module can be used with the virtual wire library?? Is there any other RF modules with 1KM range available that can be used with arduino??
Thank you

Erdin

#1
Mar 25, 2013, 09:04 pm Last Edit: Mar 25, 2013, 09:08 pm by Erdin Reason: 1
The VirtualWire is for the cheap on/off RF modules.
The VirtualWire makes the protocol in software.
Switching the transmitter on and off is called ASK.
http://en.wikipedia.org/wiki/Amplitude-shift_keying

Typical hardware chips for a protocol are the CC1101 modules.

The 1 km modules use FSK.
http://en.wikipedia.org/wiki/Frequency-shift_keying
I can't tell if they have a chip for the protocol or not (I think not). There is not enough information on that page.

There are other 433MHz modules like that. But I would not rely on them to get as far as 1km.
You could use a module like that, but with an antenna connector and use directional antennas.
And some modules have LNA. Search Ebay for "cc1101 lna" and you will find some.

John_Smith

The link says 100m range.

I am gtting 500m range with SIM20 modules without just a 17cm wire, they say you can get 1500m.
45 years of editing projects with a knife and soldering iron, then I found Arduino !

s_premkumar999

Thanks a lot for the replays  :)
I saw that the SIM20 device you told has both SPI and UART interface, i think that will be the best option for my work.
Can You please help me more about its interfacing with arduino.

One more doubt, In my application i need only to transmit some ASCII values from the remote area to a control tower located >1km apart, so no need for a transceiver, so is there any other device which match this profile?

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