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Software Defined Radio
Decouples control and location of transmitter/receiver stations
Potentially cheaper than traditional radios
multiband SDR RX/TX kits available for < $100.
Anyone can listen to radio worldwide through WebSDR.
Is quietly overturning the way people use radio. Many new radios use SDR under the hood, including the cheap handheld I have.
Haven't built my SoftRock SDR kits yet ...