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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