Speaking of Software Defined Radios.... Have a look at this.....
EMERGING TECHNOLOGY: BEARTOOTH ADDS VHF AND UHF VOICE AND DATA COMMUNICATION CAPABILITY TO SMARTPHONES
You have all heard of Bluetooth and some of you may be familiar with goTenna. Now add a new communications device called Beartooth that adds VHF and UHF voice and data communications capability to smartphones. We get more from George Thomas W5JDX:
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According to its experimental license grant WH2XLW, the Beartooth can operate anywhere in the 137 to 174 MHz and 400 to 470 MHz bands with an Effective Radiated power of two watts. According to Comsearch's FCC emission designation decoder the license appears to cover amplitude modulation and phase modulation transmitting voice, data and telegraphy for automatic reception.
The Beartooth unit is described as a software-defined radio receiver and transmitter that interfaces with supported devices and includes a battery to double smartphone battery life. Uses include personal communications, industrial communications services, and public safety.
Since the device is an SDR with a wide frequency range, it not only supports the same type of personal communications provided by the the recently introduced goTenna, but also adds the ability to communicate with any analog radios operating on Family Radio Service, General Mobile Radio Service or Multi-Use Radio Service spectrum. The device is also said to be usable on the amateur 2 meter and 70 centimeter bands.