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Radio Direction Finding
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PA3BNX:
Hello Every Body,


Some intresting YouTubes


Apex HF direction


Directional Recieving Antenna  HF KB7GF Mark Bauman

https://www.youtube.com/watch?feature=player_detailpage&v=i46kR0pynFw
https://www.youtube.com/watch?feature=player_detailpage&v=hBkzWQ9R91Q

Aha Moment



New Find Outs
https://www.youtube.com/watch?feature=player_detailpage&v=3LSJLlxbXiM
https://www.youtube.com/watch?feature=player_detailpage&v=DRlegDqOXU4
https://www.youtube.com/watch?feature=player_detailpage&v=8LXZt7DgbTA

On our Dutch Forum
Lee Hocool  Inteferometer
http://www.zendamateur.com/viewtopic.php?f=14&t=15649

PA3BNX:
Hello Every Body,


New version of Mymapping on our sites

Also small maps of whole Neteherlands on the site now.

Take a look here

REDHAWK SDR

http://www.geontech.com/download/white_papers/AOC_Challenge_GEON.pdf

Take a look it's realy intresting !

Picture of running Arduino Doppler with lm3914 Peleorus and MyMapping 1.58 on the laptop
PA3BNX:
Hello Every Body,

Today I wrote RightLeftRotating in Arduino.ino

With command R in ArduinoTerminal or button RL(in new MyMapping.exe) you can change the Doppler antenna rotation sequence from the antenna array

1234 1234 1234 1234 to
1234 3214 1234 3214

So one round right and then one round back to begin situation

What is the advantage of this?

The FM discriminator curve in the receiver can have a wrong
measurement if it's not symmetric.
This happens when the receiver is not exact adjusted to centre TX frequency or when the S-curve of the frequency discriminator is not
linear.

By rotating up and down you can average +/- frequency discriminator
errors.

If you switch between NormalRotation and RightLeftRotation
you hear the Doppler tone frequency halve.
The pelorus degrees stays the same


Of course CW/CCW adjustment stays the same.

Also with the plate antenna this is possible but it wil not give
benefit with AM detector



If you switch to RightLeftRotation you cannot use the arduino
on the sound-card with my soundDoppler.exe program.

So switch back to NormalRotation

Greetings,

PA3BNX

 :)




PA3BNX:
Hello Every Body,

Nice to watch:

Narda
PA3BNX:
Hello EveryBody,

I found this old RDF article about RDF RSSI meter hi
connected to a MW transistor radio.

Nostalgia !

And a PCB Layout for the SuperSimpleArduinoDoppler project.

in Sprint50 Not all ready I think..

You need wires to connect it to the ArduinoUno

But it can also wired to a Raspberry Pi GPIO Pins ?

Need to write software for that hi !!



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