Electronics > Projects, Designs, and Technical Stuff
Radio Direction Finding
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PA3BNX:
Hello to all,

I am working on a VHF Direction Finder working
on the PC soundcard  with GPS (etrex) and plotting real time
on maps.

So see the pdf file for circuits

And the zip file for other design from do2scf

Let me know what you think of it

Any comments ?

Psi:
Nice, I've always wanted to build something like that.

Does the direction finding work equality well for signals that are meters away and signals that are a far away? (like a few km. Assuming the signal is strong enough to be received)
PA3BNX:
Hello everybody,


It works best if the antennes are positioned free and high and outdoor.

Other wise you have multipath and reflections.

You must have a minimum distance from the tx antenna array about 3 a 4 meters.

The distance can be of cource depending on power , height and annnas of transmitting station up to

20 to 50 km.

Practically speaking the optical horizon distance.

The program MyMapping.exe has also a optical horizon calculator witch can plot
range circels on the map

d=3.58 * sqr(h1 + h2)

d in km
h1 and h2 antenne heights in meters.

 
PA3BNX:
Hello Everybody,

I did post the antenna array for the doppler

It's a alu round plane with wooden base

and 4 whips of about 50cm welding wire 3 mm

Note that the antennas are not on the edges.



PA3BNX:
Hello Every Body,

I am also building a HF Peiler for the 80 meter amateur bands

That uses the catcontrol from a Yaesu FT817 or FT840

That reads the RSSI an switches the magloops on of with the Sense antenna.

This project is still under programming and construction

So hint and tips ?
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