Hello Everybody,


Sophisticated Radio Direction Finding 


Whats needed for a Sound-Doppler Mobile Foxhunt
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Go with at least two persons.
One driver and one operator.
Safety first ! 
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Download the latest version Sound-Doppler and APRSIS32


Just buy 
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1 Laptop with XP/Vista/Win7/8
1 USB Stereo input Sound-card if the PC doesn't have it like UCA202 
1 GPS mouse with rs232 or USB with NMEA witch can output the $GPRMC 
1 FM Rx Porto or scanner or a FT817 with cat62 cable
1 Maybe you need USB to RS232 converter (FTDI) cables to

To build assemble yourself
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1 SuperSimpleSoundDoppler Generator
1 4x Antenna Array

You can buy the PCB's from PA8W 
http://members.chello.nl/~w.hofman/pa8w/rdf.htm

The best SuperSimpleSoundDoppler-generator is the hardware with 4 soft-switch
transistors connected to the 4017 chip.
This Doppler detects weaker signals and it has less influence from
strong neighbor channels.


1 50 ohm coax cable(rg58) with connectors BNC /SMA
1 Control cable with 5p Din connectors
1 USB or rs232 db9 cable to make the GPS mouse cable longer so it can
  reside on top of the car roof.

1 shielded audio cable with 3.5mm stereo jack to loudspeaker rx and SuperSimpleSoundDoppler-generator 
1 Maybe a switchable monitor loudspeaker
1 Maybe needed a simple stereo-preamp for the USB Sound-card with isolation
  1:1 transformers to avoid ground loops.

 
1 12V board supply connector block
1 adapter to feed the laptop from 12 volts (Home brew ?)
(Maybe you need a up converter many laptops have adapters on 17 Volt)

Try to create a box or assembly where all the hardware resides.
Make sure you can see the laptop screen and try to shield it from sunlight.

If using APRSIS32 then also cache the tiles from the region where the hunt happens.
Play with the software at home so you know how the software and hardware works!

I think anyone can become a prof-hunter with this equipment.

In the mean time I try to make the software as good as it can be !

Happy Mobile (Fox/Balloon/Kerchunker) Hunting

PA3BNX

New
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If you buy a cheap DVB-T dongle like the RTL2832 R820T then you can have on the 
same PC running a spectrum analyzer with 2 MHz bandwidth with an all mode demodulator.

SDRSharp
SDR# from Youssef Touile