Download of Linrad_04.06_x86_64.deb (Linrad_04.06_x86_64.deb ( external link: SF.net): 2,411,530 bytes) will begin shortly. If not so, click link on the left.
Together with hardware that can bring RF signals into digital form Linrad forms an SDR receiver. (A Software Defined Radio receiver.) There is also a transmit part inside Linrad that will form an SDR transmitter together with appropriate hardware. (The transmit side is still at an early development stage.)
