| Electronics > Projects, Designs, and Technical Stuff |
| 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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