Radio Frequency Direction Finder
http://youtu.be/ZUqzdrB1o2U
Showing posts with label Free RDF software. Show all posts
Showing posts with label Free RDF software. Show all posts
DSP-RDF Doppler Radio Direction Finder Kit
DSP-RDF Doppler Radio Direction Finder Kit
This kit is based upon the N0GSG DSP Doppler featured in the November 2002 QST Magazine. Doppler RDF units determine the bearing to a signal's source by electronically rotating four antennas, arranged in a circular pattern, at a high rate of speed. The signals received at each antenna are combined and passed on to your FM receiver which is tuned to the frequency of interest. The FM receiver detects the incoming signal and produces an audio tone which is then passed back to the Doppler unit. Inside the Doppler unit are two microprocessors which control the antenna switching and process the audio tone, from the receiver, using DSP techniques. The result of this processing determines the relative direction to the signal source. The direction is displayed continuously in real-time on a circular array of 16 LEDs, each representing 22-1/2 degrees of angle. In the case of intermittent signals the microprocessors save and display the last directional information (shown as a flashing bearing indicator) until the signal is again active. Active signals are displayed as a steady directional indication. The DSP-RDF Doppler kit being offered by W6DFW incorporates another feature not in the original design. This feature allows direction finding of a jamming signal even when the jammer is broadcasting a tone intended to interfere with Doppler units.
This kit is based upon the N0GSG DSP Doppler featured in the November 2002 QST Magazine. Doppler RDF units determine the bearing to a signal's source by electronically rotating four antennas, arranged in a circular pattern, at a high rate of speed. The signals received at each antenna are combined and passed on to your FM receiver which is tuned to the frequency of interest. The FM receiver detects the incoming signal and produces an audio tone which is then passed back to the Doppler unit. Inside the Doppler unit are two microprocessors which control the antenna switching and process the audio tone, from the receiver, using DSP techniques. The result of this processing determines the relative direction to the signal source. The direction is displayed continuously in real-time on a circular array of 16 LEDs, each representing 22-1/2 degrees of angle. In the case of intermittent signals the microprocessors save and display the last directional information (shown as a flashing bearing indicator) until the signal is again active. Active signals are displayed as a steady directional indication. The DSP-RDF Doppler kit being offered by W6DFW incorporates another feature not in the original design. This feature allows direction finding of a jamming signal even when the jammer is broadcasting a tone intended to interfere with Doppler units.
SHTF Intro To Radio Direction Finder "Seek & Destroy"
SHTF Intro To Radio Direction Finder "Seek & Destroy"
Real life radio direction finding. Taking this teachable moment to demonstrate various gear & techniques in radio direction finding. Not a gear review, but a concept video of the subject.
Real life radio direction finding. Taking this teachable moment to demonstrate various gear & techniques in radio direction finding. Not a gear review, but a concept video of the subject.
Radio Direction Finding Networks
Radio Direction Finding Networks
Pacificon 2012 Presentation given by Marcel Stieber, AI6MS, Graduate Student at California Polytechnic State University.
Pacificon 2012 Presentation given by Marcel Stieber, AI6MS, Graduate Student at California Polytechnic State University.
Free RDF software
Free RDF software
Super Simple Sound Doppler
Lodewijk, pa3bnx developed very nice software for this. It can plot the bearing directly on a electronic map if you want, and with GPS data it can plot and refresh your own location on the map as well. At december 31st 2013 I spoke to Lodewijk and explained my new idea to add a elevation indicator to the RDF, based on the reduced doppler amplitude on signals with higher elevations. I was waiting for a LED driver IC to build this addition.
Super Simple Sound Doppler
Lodewijk, pa3bnx developed very nice software for this. It can plot the bearing directly on a electronic map if you want, and with GPS data it can plot and refresh your own location on the map as well. At december 31st 2013 I spoke to Lodewijk and explained my new idea to add a elevation indicator to the RDF, based on the reduced doppler amplitude on signals with higher elevations. I was waiting for a LED driver IC to build this addition.
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PA3BNX Super Simple Sound Doppler Finder. Homebuild VHF/UHF DSP Direction Finder connected to the soundcard off the PC. Easy to connect to line input of ...
www.pi4wag.nl/projecten/doppler-peiler-radio-direction-finder
https://verbed.home.xs4all.nl/hamspace/pa3bnx/sounddoppler/Flyer%20Doppler-UK2.pdf