I came across a remote control that uses the 902-928MHz band. Can a smartphone transmit WiFi/Bluetooth over those frequencies? If yes, is there anything special about it?



closed as off-topic by Leon Heller, Daniel Grillo, Matt Young, Chetan Bhargava, Nick Alexeev Dec 3 '13 at 19:05

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  • 2
    \$\begingroup\$ WiFi & BT operate over the 2.4 (and 5) GHz bands don't they? \$\endgroup\$ – RedGrittyBrick Dec 3 '13 at 15:31
  • \$\begingroup\$ It seems like you might be better off first analyzing how the remote control is built and use that information to implement whatever it is you are thinking of. \$\endgroup\$ – HL-SDK Dec 3 '13 at 15:34
  • \$\begingroup\$ Whats your idea of analyzing the remote control and then using it to design what I want? Any leads or thoughts you want to share? \$\endgroup\$ – KingsInnerSoul Dec 3 '13 at 15:40
  • \$\begingroup\$ Yes, gladly. I own a piece of SDR (Software defined radio) hardware. It has a very large tunable range (from hundreds of megahertz to a few gigahertz) and decent instantaneous bandwidth. With some hard work, you could deduce the modulation scheme of the remote control and emulate that. Still -- without going through all that trouble and financial investment, you may want to just open up the controller and see if it is using a cc1110. Then you may be able to dump the firmware, etc etc etc. \$\endgroup\$ – HL-SDK Dec 3 '13 at 16:44
  • 1
    \$\begingroup\$ tl;dr you would first need to find out what modulation scheme the controller uses if you plan on controlling the remote device. Taking apart electronics is fun! \$\endgroup\$ – HL-SDK Dec 3 '13 at 16:45

Can a smartphone transmit over the 902-928MHz bands?

Maybe, depends on the cellular system it is designed to interface with.

Can a smartphone transmit WiFi/Bluetooth over those frequencies?

No, both bluetooth and most wifi implementations target the 2.4GHz band.

Sure -- you could theoretically change the physical layer to transport over a different frequency band but that would require design of new radio frequency circuitry. It is not a simple software solution.

  • \$\begingroup\$ Yes, I know how the bandwidths of BT and WiFi. Just wanted to see if there is someway to hack the android software to manipulate the builtin antenna \$\endgroup\$ – KingsInnerSoul Dec 3 '13 at 15:41

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