Recently, on Feb 21, we posted news about the release of some spectrum analysis and FM demodulator software from M. Khanfar. Now he has just released his latest software "Khanfar Direction Finder" (scroll to the end of the page), a Windows radio direction finding tool for RTL-SDR dongles.
Khanfar Direction Finder appears to work on the principle of power measurements through the use of directional antennas. Four directional antennas are connected to four RTL-SDR dongles positioned in the N/S/E/W directions.
The antenna pointing towards the signal source will receive it stronger and the antenna pointing away from it will receive it weaker. The two other antennas may receive the signal with some intermediate strength based on the angle. The software automatically combines the power information from all four antennas, resulting in a bearing.
The 'Quintet' version of the software also contains a map that can be used to plot the determined bearings.
Both versions of the software are free to download but not open-source. As mentioned in the previous post, antivirus software can flag M. Khanfar's software as suspicious. We suspect these are false positive results due to the PyInstaller system used to create the exe, but please take your own precautions just in case.
