Over on YouTube channel TheSmokinApe has uploaded a video about using RF filters with an RTL-SDR. In the video he first explains why FM bandstop and AM high pass filters might be required when using a software defined radio in order to avoid overloading the SDR with very strong signals. He goes on to test and review our RTL-SDR Blog FM Bandstop and AM Highpass filters, by testing them on a spectrum analyzer.
Back in June of 2014 we posted about the released of a new program called RTLSDR-Airband. RTLSDR-Airband is a Windows and Linux compatible command line tool that allows you to simultaneously monitor multiple AM channels per dongle within the same chunk of bandwidth. It is great for monitoring aircraft voice communications and can be used to feed websites like liveatc.net.
Since our post the development of the software has been taken over by a new developer szpajder, who wrote in to us to let us know that he has now updated RTLSDR-Airband to version 2.0.0. The new versions improves performance and support for small embedded platforms such as the Raspberry Pi 2, but the Windows port is now not actively maintained and probably does not work. The full list of changes is shown below:
New libconfig-style config file format
util/convert_cfg: can be used to convert old-style config.txt to the new format
Syslog logging (enabled by default)
Reworked makefiles, added install rule
/dev/vcio is now used to access GPU on Raspberry Pi; creating char_dev no longer necessary
Startup scripts for Debian and Gentoo
Support for auto gain setting
Support for multiple outputs per channel
Support for recording streams to local MP3 files
Support for ARMv7-based platforms other than RPi (eg. Cubieboard)