Single pin or two pins command between switch ports. Resources listed under RDF Projects category belongs to Technical Reference main collection, … Pseudo Doppler direction finding has been used for a long, long time. But it does require that all the SDR paths be coherent – use the same oscillator. Spinning the antennas at 20 kHz meant there was only 20 kHz difference in these copies, resulting in a mess that can’t be decoded. By using several ShotSpotters in a tandem configuration, you could get an exact location within milliseconds of occurrence. Would be willing to pay money to see that happen. RTL-SDR Discussion • What is simplest software that will direct sample with an appropriate sample frequency? Assif wrote a reply on Building a 22MHz Z80 Computer in 4 Stages. As other have said, there are still plans online based on switched filters and simple switching diodes for the antenna switches. In any case it’s very complex shit and matching that with SDR makes it even more complex but work is being done in the big companies and PhDs are being written on it. I looked for amplitude based info and didn’t see it. I find more information via my own web searches and stumble upon all the stuff HaD steals and then writes up…. User Projects • Re: OpenEar will be new software for listening to Voice and data of protocols(Tetra, DMR, MPT,...). Is there somewhere in the scheme of how to build Redhawk individual station connected directly to the laptop without Rabperri Pi? Because of our outstanding reputation, clients worldwide use our direction finders in many ways. I’ve been experimenting with pseudo dopplers and amplitude RDF’s for the last 10 years or so. Or use your earballs and move the antenna to find the null. The RDF41 pseudo doppler radio direction finder kit, pre-assembled and pre-programmed: (Revised march 2020: disable auto-reset by adding 220nF, see wiring diagram) This almost ready to use kit will give you semi professional performance for a modest price. It’s $169.95 from Mini-Circuits. You would just programmatically poll each SDR for the carrier amplitude strength (from the AGC), and then mathematically compute the amplitude phase angle from one of the two Yagis that are the strongest receivers of the target signal. Same here, I’d like to know how to gang these units to get full positional information for mobile phones transiting through an area, for a physical security application. This site uses Akismet to reduce spam. The latest in affordable Doppler direction finding equipment available in a complete kit form ..this one even includes the receiving antenna. I haven’t published much, but what I published works. Last time I saw a spinning antenna it was a navigation aid called TACAN. With Doppler I thought you had to have a baseline heterodyne RF signal setup locally, then as your virtual-spinning aerials approach the DF target or falls away from it, you notice Doppler shift in the audio tone component. Like building a car with egg shaped wheels and have a computer sort out how to continuously adjust the suspension to compensate for that….
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