He wants lower carrier frequencies, not more receive bandwidth. For example, HF [1] is 3 to 30MHz, and cannot be received by HackRF without an upconverter, whi

He wants lower carrier frequencies, not more receive bandwidth. For example, HF [1] is 3 to 30MHz, and cannot be received by HackRF without an upconverter, which adds another board and another $43 [2] to the equation. Also, if you want to go all the way down to DC, the upconverter approach doesn't really work. [1] http://en.wikipedia.org/wiki/High_frequency http://en.wikipedia.org/wiki/High_frequency [2] http://www.nooelec.com/store/ham-it-up-v1-0-rf-upconverter-for-software-defined-radio.html http://www.nooelec.com/store/ham-it-up-v1-0-rf-upconverter-f...