| It's been a really fun break! I'm getting interested in super low frequency signals so I looked up the E202 Very Low Frequency (<10kHz) receiver[1] and laid out/built a variation of it.[2] Right now the whole thing is a broadband receiver with no antenna (obviously) and the whole circuit board assembly is functionally acting like a microphone. I can hear when I touch any component or move my hand around in the air. I'm going to add a 60Hz notch file and then take it out to the middle of nowhere. I think it would be awesome to go find a pipeline to use as an antenna... Next project is to take my BlueROV[3] and build a hydrophone array[4] for it so a friend and I can see if a underwater acoustics engineer friend and I can use it to track other objects (like a remote-controlled toy boat) in the water. I've been doing some Kivy visualization of an accelerometer and gyro (MPU9255) and I think we could use matplotlib's interactive mode or something in Kivy (maybe) to visualize it all in realtime. There's nothing cutting edge here but I've done a bunch of radio frequency (RF) stuff like GPS and WiFi and I'm really enjoying how tangible audio seems in comparison. Just having fun with low frequencies, basically. [1] http://www.vlf.it/romero2/explorer-e202.html [2] https://github.com/wicker/e202var-natural-radio-receiver [3] https://www.bluerobotics.com/store/rov/bluerov-r1/ [4] http://www.dosits.org/files/dosits/hydrophone_instruc_w_imag... |
Re: using a pipeline as an antenna - I wonder how difficult (or illegal) it would be to use mains power lines. My RF-foo is only marginally above white-belt, but I'd imagine that a fair amount of low frequency signal would make it through the transformers.