[SOLVED] Sending SMS using rf module

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You should have a RF receiver at the GSM modem side and the data out pin of the RF receiver (if TTL level) has to be given to Rx pin of GSM modem. (if you transmit ascii data like "AT" from the transmitter the RF receiver at the GSM side will receive and demodulate it at give ascii data "AT" as output which when fed to GSM modem through Rx pin will give AT Command to the modem.
 

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