Hong Kong-based Signalens is preparing to launch a crowdfunding campaign for the SignalSDR Pro, a high-performance software-defined radio (SDR) unit in a Raspberry Pi-like footprint."SignalSDR Pro combines portability with performance. Roughly the size of a credit card or a Raspberry Pi, SignalSDR Pro is the perfect companion for anyone who needs powerful tools without the bulk," claims Signalens' KaiJern Lau of the company's creation. "From signal processing and spectrum analysis to communicati...