Electronics > Projects, Designs, and Technical Stuff
Radio Direction Finding
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hiishaam:
Exuse me,

I Have some questions about SoundDoppler,

1 -  For antenna switcher circuit, I will use arduino chip (microcontroller) to perform the switching operation of the 4 antennas

2 - For FM Demodulation, I have a car mp3 as transmitter so I will use car FM receiver as demodulator and then pass the signal to sound card

3 - For sound card, Is any card has stereo inputs will do the job?

For all of the previous, Is this perform a good RDF design? Because I tends to add a RDF to my graduation project

The attached picture shows a block diagram of the design, Please give me your opinion

Thanks.

hiishaam:
Sorry here's the design block diagram,

hiishaam:
Sorry I forgot,

1 - Can I use the normal car antennas to connect it to antenna switcher as the receiving antennas at the FM band 88-108 Mhz.

2 - Can I use a sound card with one line input and generate a pure 500 Hz and then uses the WaveOut Mix in my sound card to compromise the use of UCA202.

Thanks alot.
PA3BNX:
Hello EveryBody,

Yes it looks okay to me hiishaam.

I have not tried it with a broadband FM normal reciever

But I think it will work.

Arduino or 4017 circuit doesn't matter

Any soundcard that runs under windows is okay I think as long as it's stereo line/mic input.


Don't forget to have the vertical antennas need good earth if placed on a car roof

The dopplershift or deviation is a little bit small compared to wide band FM modulation..

So do not put the antenna's close to each other but about 80 cm or so in diameter I think.

See under SoundDoppler menu Info>Doppler Antenna array calculator.

To get easy all needed dimensions and parameters.

And find a place with less multipath and reflections hi...

Oh the sound card must be stereo so the 500 Hz and LF from reciever are sampeld at
exact the same time...

You can listen to the PC speakers bij playing the sound with the playback balans to the right
to hear not the anoying 500 Hz tone.

Take also a look at:

https://www.coaa.co.uk/dfplotter.htm



avis:
Dear Sir.
  Have been observing your work and glad to see your success. I repeated some of your devices. However, to get a good accurate readings failed. Now I made a flat antenna to the AM. No questions on the antenna structure. Have questions about the control scheme.
In the attached file I'm interested data items are marked in red. As these items are structured? What are their values? Possible to use standard chokes? Where in the circuit connected to pins 2 and 6 MAX232?
Your guess RDF use on a small private airfield on the frequency 128.6 MHz
                               Sincerely yours, Michael.

 

                               
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