Electronics > Projects, Designs, and Technical Stuff
Radio Direction Finding
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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