I am trying to implement a project which consists of two circuits. Circuit A receives a 125khz AM signal and modulates it to 433Mhz CC1101 which then uses 2.4Ghz carrier to send at longer distance. Circuit B receives and demodulates the 433Mhz signal back into original 125khz. I am using AS3933 for receiving 125khz LF signal and CC1101 to transmit the signal at higher frequency. The core of the project is Arduino Uno. The signal path I'm hoping is for goes like this:

(Circuit A) 125 kHz -> AS3933 -> Arduino -> 125khz to 433Mhz modulation -> CC1101(2.4Ghz)-> 2.4 GHz -> (Circuit B) CC1101(2.4Ghz)->Arduino-> 433Mhz to 125khz demodulation -> some 125khz signal modulation using coil antenna

I am wondering how do I design modulation/demodulation circuit for 125khz to 433Mhz?

Here are the datasheets:



All help is greatly appreciated!

  • \$\begingroup\$ Your question is missing links to the datasheets for the devices mentioned. Hit the edit link below your question ... \$\endgroup\$ – Transistor Sep 19 '19 at 17:48
  • \$\begingroup\$ @Transistor done \$\endgroup\$ – beginner Sep 19 '19 at 17:53
  • 4
    \$\begingroup\$ You wouldn't do the conversion with an Arduino. Nothing about the Arduino goes anywhere near 2.5GHz. You would modulate the 125kHz onto a 2.5GHz carrier, transmit, receive, demodulate. You might use an Arduino to generate the 125kHz signal to transmit, and you might use an Arduino to detect the 125kHz signal once it has been demodulated. In between has as much to do with an Arduino as a fish has to do with tap dancing. \$\endgroup\$ – JRE Sep 19 '19 at 17:54
  • \$\begingroup\$ I seriously doubt the Arduino can generate/detect the 125 kHz signal either. \$\endgroup\$ – Enric Blanco Sep 19 '19 at 17:56
  • \$\begingroup\$ @beginner You would also need a license to the 2.5GHz band \$\endgroup\$ – Voltage Spike Sep 19 '19 at 17:56

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