| Electronics > Projects, Designs, and Technical Stuff |
| Radio Direction Finding |
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| PA3BNX:
Hello every Body, I thought of a simple way to switch from a VHF to a UHF direction finding antenna array on the SuperSimpleSoundDoppler connected to a VHF UHF scanner or receiver with one input antenna connector. So something like this should do the trick. Even with cheap print relays. |
| PA3BNX:
Hello EveryBody, We have a new SuperSimpleSoundDoppler de Luxe It does softswitching the antennas So it has less reciprocal mixing of in band adjacent strong signals. Easy to build I think See also http://members.chello.nl/~w.hofman/pa8w/sssd.htm If you use 3 diodes like 1n4148 in the dipoles circuit you can raise the 7805 with a si-diode. or put in a 7806 regulator. And I am currently working on SoundDoppler129.exe software to make it running with APRSIS32 APRSIS32 is a very nice APRS software witch is updated regularly. See some links: Lynn Deffenbaugh KJ4ERJ APRSISCE32 You Tube http://df8ls.de/documents/APRSIS32-Manual.pdf Passcode requests need to be sent to aprsisce-owner@yahoogroups.com with your name and callsign |
| PA3BNX:
Happy NewYear2013, I am stil programming to get SoundDoppler.exe running together with APRSIS32.exe. Okay it's going slow but steady. New version SoundDoppler130All.zip on the PI4WAG site http://www.pi4wag.nl/index.php/pseudo-doppler-radio-direction-finder |
| PA3BNX:
Hello EveryBody, Today I found these two links Very intresting for every Radio Direction Finder Freak. The Future of Radio Direction Finding ? http://www.ni.com/usrp/ On the site of PA8W the new 8 dipole doppler circuits are available Feed with just one coax to the switcher unit. Version 3 Doppler http://members.chello.nl/~w.hofman/pa8w/V3.htm http://members.chello.nl/~w.hofman/pa8w/DopplerRdfMainDiagram3.htm I am currently still programming to get sounddoppler.exe running with APRSIS32.exe I also have included in the upcoming version a possibility to send the file packet.txt through the comport to other applications. And it's full APRS compatible of course. |
| PA3BNX:
Hello EveryBody, I bought a cheap USB SoundCard U-Control UCA202 Behringer.com It works okay with SoundDoppler on Windows XP Just one thing it cannot adjust in software the stereo input levels they are fixed. It needs about 1 volt max So I had to build a small stereo preamplifier with just 2 bc549 on matrix board. (uses about 2 MA at 12 volt) Now it works okay. And I have two Doppler's running simultaneously running on one PC. Had to do some tweaking in MyMapping software. Now I have a cyan arrowpoint if it's doppler1 a yellow arrowpoint if it's doppler2 and magenta arrowpoint if it's another station. Further I deciced that the arrow-length must be according the APRS101.PDF protocol spec's So the next software update Will have these futures. Happy building, testing and experimenting. |
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